This paper describes the key elements of development numerical model and performing elasto-plastic and visco-plastic 3D analysis, which has not previously been developed in relation to the problem of the Tuzla Salt Mine in Bosnia and herzegovina or similar salt mines problems. Nonlinear finite element analysis allow the calculation of stresses and deformations, and so obtain the data needed to assess the stability of the salt caverns over time, and thereby the surface subsidence across the extensive area of the city of Tuzla. This required the introduction of upgrade simulation software packages ABAQUS for solving the complex problem of the Tuzla Salt Mine. It is another new and important factor in the development of numerical model, because the finite element method and computer simulation are powerful tools that assist the management and engineering force of mining companies with taking reasonable decisions about and steps toward improving the quality of work and safety of all employees, as well as the whole environment in the zone of subsidence. Results of stress strain analysis have been compared with measured values (vertical displacement of surface), over a period of time. 1. Introduction The Tuzla Salt Mine is considered as a major and one of the most serious ground displacement problems in B&H, and also in Europe. Uncontrolled salt extraction from this mine has produced about 80,000,000 m3 of salt water, with a salt mass deficit of about 12,000,000 m3 created below the immediate urban area of the city of Tuzla. This long-term uncontrolled process of extraction of salt water from the Tuzla mine has resulted in ground subsidence in the central part of the city, causing significant damage to the city infrastructure and facilities. Ground subsidence and surface deformation have caused the demolition of about 2,700 housing units, approximately 67,000m2 of production facilities, and 130,888m2 of educational, health, cultural, and sports facilities. Due to this, 15000 inhabitants have been displaced from the affected area. The catastrophic consequences arising on the ground surface necessitated the closure of the salt mine and salt caverns is filled with water. Although salt water leaks have been detected and sealed, ground across the city of Tuzla has continued to subside, with the occurrence of landslides, unstable slopes, and other types of ground movement.

The Silurian Longmaxi shale formation is a widely distributed gas reservoir in the Sichuan Basin of southwest China. The thick clay rich shale has relatively high organic content, is thermally mature and is a major target for China's shale gas production. In recent years the shale has become the host to an increasing number of induced earthquakes potentially linked to fluid injection related to hydraulic fracturing. These induced or triggered events are linked to the reactivation of faults. This paper explores the frictional and stability properties of Longmaxi shale to provide insights into the causal mechanisms of induced seismicity and their geological and structural controls. Rock samples from a geological section spanning ~150 m were powdered for friction experiments at recreated in-situ stresses and temperatures. Experimental results show that fault frictional and stability properties are strongly controlled by mineral composition. Frictional strength increases with a reduction in phyllosilicate content and exerts a significant control on seismicity. Two of the ten samples exhibited velocity weakening behavior under in-situ conditions, potentially identifying compositions that contribute to unstable slip. These findings have important implications in understanding the frequency and occurrence of induced earthquakes triggered as a result of hydraulic fracturing. 1. Introduction The rapid growing earthquakes induced by shale gas hydraulic fracturing have aroused wide concerns in recent years (Bao and Eaton, 2016; Ellsworth, 2013; Lei et al., 2017). The large-scale fluid injection can generate high pore pressure in the subsurface and may activate the pre-existing faults (Elsworth et al., 2016). Previous researches demonstrated that the fault sliding behavior is governed by the frictional properties of fault gouge (Kohli and Zoback, 2013; Zhang et al., 2019). Thus, a careful examination of the fault gouge friction properties is important for understanding the underlying mechanism of fault activation and mitigating the seismic hazard during shale gas fracturing. The Silurian Longmaxi shale is a major target for shale exploitation in southwest China. In this work, the Longmaxi shales recovered from the outcrop in Sichuan Basin, southwest China were sieved to simulate the fault gouge. The friction experiments were conducted on these simulated fault gouges at hydrothermal conditions to explore the effect of mineralogy on gouge frictional and stability properties.

Kyaukpahto gold mine located in the Kawlin Township, Sagaing Region of Myanmar is the first open pit and the largest gold mine of Myanmar. As the gold is exploited by open-pit mining, a large amount of waste rocks are disposed at waste dumps near the mine site. The metal sulfides such as pyrite, arsenopyrite, and chalcopyrite in the waste rocks are exposed to the surface, favoring the oxidation of these metal sulfides and generating acidic water. There is a possibility of AMD generation in the open pit and at the low grade ore dump. This work focuses on assessment of the potential acid-forming waste rocks and characterization of these waste rocks in Kyaukpahto gold mine. Waste rocks and water samples were taken from the open pit, low grade ore dump, and waste dumps and subjected to various tests and analyses such as NAG test, Paste pH test, Paste EC test, ANC test, XRF, XRD, and ICP-MS analyses. Based on the results of the chemical tests and analyses, waste rock samples collected from open pit and low grade ore dump are identified as PAF rocks which particularly concerned with the potential generation of acidic mine water. Two-step batch leaching test indicated that low pH value (pH 4) and elution of metal ions such as As, Al, Fe, Cu, Zn, and SO 4 2− were observed with the high concentration from the samples. Elution of As is higher than other metal ions and this elution process will take place over a longer period than other metal ions. Thus, it is very critical to take appropriate measures against generation of AMD, such as controls on sulfides oxidation, and reduction of metals elution. 1. Introduction Acid mine drainage (AMD) which is also known as acid rock drainage (ARD), causes environmental problems that affect many countries with historic or current mining activities. AMD is resulted from the exposure of sulfide ores and minerals to water and oxygen. When the ore is exposed to generate AMD, sulfate and heavy metals such as iron, copper, lead, nickel, manganese, cadmium, aluminium and zinc are also released to contaminate into that water (Moodley et al., 2017). Acidic, metals-rich waters may also form in spoil heaps, waste rocks and mine tailings, essentially by the same biologically reactions as in mine adits, shafts, pit-walls and pit-floors. Due to the more disaggregated (and more concentrated, in the case of tailings) nature of the acid-generating minerals in these waste materials, AMD that flows from them may be more aggressive than that discharges from the mine itself. Another important consideration is that it poses the potential long-term pollution problem as the production of AMD may continue for several years after mines was closed and tailing dams was decommissioned. (Johnson & Hallberg, 2005). The most common acid-generating sulfide minerals are enlisted as pyrite/marcasite (FeS 2 ), pyrrhotite (FeS), chalcopyrite (CuFeS 2 ) and arsenopyrite (FeAsS). In general, pyrite, the most common sulfide mineral of waste rocks and typical of many oxidation processes during weathering, is oxidized in accordance with the following reactions (Sengupta, 1993): (Equation)

Abstract Tunnel Boring Machines(TBMs), as the most advanced excavation technology in the current tunnel construction, are widely used in underground engineering. Especially for the deep and long tunnel with TBM excavation, the initial geological exploration cannot fully reflect the situation of the stratum, the effective construction of TBM will been affected to a certain extent. In this paper, a new TBM surrounding rock mass classification is proposed based on the improved energy method. The relationship between the geological conditions and the specific energy (SE) is established considering three part, the geological conditions, the TBM operation specifications and their interaction, including the tunneling parameters and the shape of rock slag. Two important index of specific energy are calculated separately, the total specific energy (TSE) and the rock crushing specific energy (RCSE). It can be found that the RCSE has a good correlation with the stratum. According to the proportion of RCSE account for the TSE, the TBM surrounding rock mass can be divided into four classes, class I to class IV. The lower the class is, the higher the efficiency of TBM excavation is. Also, during TBM excavation process, the value of RCSE and TSE are changing, the front stratum can be predicted by the change of the RCSE, and the TBM tunneling state can be deduced by the new surrounding rock mass classification. For different classes, several flexible measures are suggested to ensure the TBM excavation more efficiency. And a real-time system is established to predict the stratum and evaluate the TBM performance. Furthermore, this TBM surrounding rock mass classification method is applied to the YinHanJiWei water conveyance project. 1. Introduction In recent years, with the acceleration of infrastructure construction and urbanization process, tunnel boring machines (TBMs) are widely used in tunnel excavation. In the process of TBM design, manufacture and construction, the construction efficiency is the key to the success or failure of the project. In practical engineering, the tunneling speed of TBM is greatly affected by geological conditions, and the tunneling rate can vary from 1 to 1500 m per month (Bai et al., 2005). Therefore, it is very important to establish the rock mass classification based on TBM construction to predict the TBM tunneling efficiency (Wang, 1998; He et al., 2002).

Abstract We present an optimized training and prediction model for Rate of Penetration (ROP) forecasting using on-line artificial neural network (ANN) in real-time. The technique aims to assist decision making on drilling operations by predicting ROP under a given set of drilling conditions. The scenario modeler relies on real time drilling data analysis, and it is capable of handling cumulative information analysis in real time for ROP prediction within the same well, but also can consider drilling data gained from other fields under similar conditions. The real time prediction model has been applied to drilling data coming from a geothermal project of over 4 km depth, located in the Pohang, Republic of Korea. The observed results with respect to data intervals or sections set the basis for further adjustments to the model, and encourages its use in different drilling situations. 1. Introduction ANN have been applied to a wide variety of field research areas that include computer vision, speech recognition, and petroleum engineering (Bilgesu et al., 1997). Especially, in the aforementioned field, ANN have been used for ROP forecast (Gidh et al., 2012). It has been shown that this technique is dependent on the size and accuracy of the input parameters, and in general the more number of data points, the better the results. Its ability to consider more drilling parameters into the model makes it advantageous (Monazami et al., 2012). During ANN learning phase, a selected group of input parameters are provided to the model and they serve to train the algorithm. Two basic types of learning modes can be mention, On-line and off-line training, and they distinguish from each other basically on the training cases are managed after training (Shin 2001). In on-line training, the provided input parameters are discarded after being processed, however the weights are updated. Owing to the accumulative manner the drilling data is generated in the field, this work explores the applicability of an artificial neural network with an on-line training mode for ROP prediction especially in subsequent drilling sections within the same well.

Abstract Void existing in the close vicinity of mountain tunnel lining is one of the causes that lead tunnel lining to damages. These damages include cracks and chip off-falling and may further develop into failure of tunnel lining. During the construction of mountain tunnel, void behind primary lining can be generated by overbreak and lack of backfilling, and its existence has been proved in many cases by advanced detection devices such as ground penetrating radar. To ensure the safety of tunnel lining as well as the personnel, discuss of the effect of void behind lining is necessary. Moreover, since most of the mountain tunnel in China are excavated by drilling and blasting method, the impact of tunnel face's blasting should be considered when analyzing the void's influence. Based on the monitoring data collected from in-situ test in Zhujiawu Tunnel, a numerical model considering tunnel face's blasting impact is established to study the influence of the void behind lining in both static and dynamic states. The numerical model is verified by the primary lining's oscillation velocity data, which was monitored near the tunnel face. According to the simulation, voids clearly reduce the tunnel lining's FOS in static condition, and enlarge the oscillation velocity of tunnel lining and surrounding rock in blasting striking. By comparing the oscillation velocities of lining in void and non-void situation, an amplification factor can be defined to describe the effect of voids in blasting impact condition. This factor can be used for assessing the risk of specific void behind tunnel lining. 1. Introduction Void behind mountain tunnel lining is one of the main causes of lining damages. Damaged tunnel lining is dangerous on the lining serviceability, for instance, Rebunhama tunnel concerning an accident caused by spalling of tunnel lining (Asakura and Kojima 2003). Many researchers have studied the effect of voids behind lining. Leung and Meguid (2011) conducted an experimental study on earth pressure using mechanically adjustable lining system, and confirmed that local contact loss or void would change the distribution of earth pressure. Meguid and Dang (2009) discussed the effect of erosion voids using analytical and numerical analysis in which the bending moment and thrust force changes due to the void were evaluated. Ahmed and Ansell (2012) studied the response of hard rock tunnel shotcrete when exposed to blasting striking by using structural analysis and discussed the safety of shotcrete. But few studies have focused on the voids influence when coupled with blasting impact.

Abstract Firstly based on a flexural experiment of six STS simply members, this paper reveals force model of STS member and obtains key parameters affecting force of STS member. Moreover, a finite element model of STS member is established to optimize the key structural parameters. Secondly FLAC3D is used to build a three-dimensional model and to analyze effect of excavation order of pilot tunnel, excavation order of upper floor, temporary support, stiffness of pipe roof and step length of pilot tunnel on ground settlement and deformation of pipe roof supporting structure for a subway station combining STS with PBA method. Finally based on the structural characteristic of a subway station, influence of construction step on ground settlement, deformation of pipe roof and pier, initial supporting of pipe roof is analyzed with numerical simulation and in-situ monitoring. The results indicate: different excavation order of pilot tunnel and excavation order of upper floor have more effect on ground settlement; it can significantly reduce ground settlement by decreasing length of horizontal pipe roof and making full use of lateral anti-arch interact; through temporary support is erected, it not only reduces settlement of side span, but also limits vertical deformation of pipe roof; the design of step length is reasonable, and can effectively control ground settlement and stability of excavation face. 1. Introduction The stress redistribution process induced by underground excavations causes soil movements around excavation face in earth mass and finally reflects on the ground surface. Surface settlements caused by underground excavation probably induce severe damages to adjacent buildings and underground facilities, (Sadaghiani et al., 2010; Anastasopoulos, 2013). However, construction of the subway is mostly planned in the prosperous area of city center, it is very necessary to control the surface settlement in the process of constructing the subway. With comprehensive study of experts and scholars from home and abroad, Some methods forecasting surface settlement are proposed by Peck (1969), O'REILLY M P (1982), Wang and ITA (2007), Novozhenin (2016). Meanwhile large span underground excavation in urban area has some characteristics such as wide span, low overburden, heavy street traffic and complex environments, excavation-induced instability and settlement have become principal concern in the design and construction, (Kivi et al.,2012).

Abstract Mechanical properties and failure characteristics of specimens containing a couple of flaws under unloading condition has been studied by particle-flow-code (PFC) simulation. The results show that different unloading rates (Δ t ) and flaw inclination angles (α) result in variations in the unloading strength, deformation and crack effect for the pre-flawed specimens. Compared with intact specimens (without pre-flaws), the unloading strength of the pre-flawed specimens decreases nearly 5.5~20%, and faster unloading rates or smaller flaw inclination angles will lead to lower strength. Furthermore, the crack effect are investigated to understand the failure mechanism. It is observed that unloading rate exerts little effect on the failure modes but can affect the number of cracks, and slower rates will generate more cracks in the specimens. In addition, the changes in flaw inclination angles will influence the failure modes and cracks number. When α = 0° and 30°, the final failure modes of the specimens are similar with each other, while α = 60°specimen is more likely to be inhibited in the generation of cracks. Introduction Excavations in rock mass under high geostress are at great risk, because unloading process would have an important effect on the failure characteristics of rock mass. And the discontinuities such as joints, cracks, fissures, weak surfaces, faults, etc. in rocks play significant roles the mechanical behaviors of rock mass under excavation unloading (Wong and Chau 1998). The mechanical properties of intact rock during unloading under high geo-stress has been widely investigated by laboratory experiments (Bauch et al., 2004; Zhao et al., 2014; He et al., 2010; Huang et al., 2014; Du et al., 2016) and theoretical analyses (Li et al., 2013; Wang et al., 2010). However, numerical simulation of pre-flawed rock specimens, which refer to rock specimens containing pre-existing flaws, under unloading condition have rarely been investigated.

Abstract Microseismic activities in the right bank slope of Dagangshan hydropower station occurred during reservoir impoundment. This paper introduces the results of microseismic monitoring, and three-dimensional (3D) finite element analysis is used to explore the microseismic activities and damage mechanisms in the right bank slope during reservoir impoundment. Based on data obtained from microseismic monitoring, a progressive microseismic damage model is proposed and then implemented in 3D finite element analysis. The safety factor of the right bank slope obtained from the 3D finite element analysis that includes the effects of progressive microseismic damage is 1.10, indicating that the slope is stable after reservoir impoundment. The microseismic monitoring system is able to capture the slope disturbance during reservoir impounding in real time and is a powerful tool for qualitatively assessing changes in slope stability over time. The proposed progressive microseismic damage model adequately simulates the changes in the slope during the impoundment process and provides a valuable tool for evaluating slope stability. 1. Introduction Landslides resulted from reservoir impoundment are common to see around the world. Reservoir landslides account for huge property losses and even make damage to people's life. Commonly, borehole inclinometer, dislocation meter, piezometer, anchor stress gauge and GPS are the main monitoring methods which are used in slopes during reservoir impounding. However, conventional monitoring methods are limited by monitoring facilities layout. Microseismic monitoring can acquire the location, time and magnitude of rock mass fracture. Microseismic monitoring technique has been used in hydraulic and hydroelectric projects in recent years (Xu et al., 2016; Tang et al., 2015; Dai et al., 2017). With the development of computer technique, numerical method is widely used to analyze the slope stability during reservoir impounding. In this paper, microseismic monitoring technique and finite element method are used to analyze the stability of the right bank slope of the Dagangshan hydropower station, which is located in Sichuan Province, China, during reservoir impounding.

ABSTRACT: For reducing boulder yield in bench blasting of an open pit mine, rock breaking mechanism in rock blasting is applied, while engineering geological survey, numerical simulation analysis and on-site tests are utilized. Through alteration of charge structure, detonate direction and adjustment of blasting sequence, fragmentation is obviously improved and the cost for secondary blasting, shoveling and loading are all reduced. 1 INTRODUCTION It is an important topic to lower boulder yield in drilling and blasting in mine. Rock blastability comprehensively reflects its own physical-mechanical properties as well as explosive and blasting process; natural rock mass contains numerous faults, joints, fractures and other structural surfaces, thus its strengthen depends on rock strength and strength of structural surface and is mainly controlled by the latter in more conditions. Therefore, most of fracture planes of rock are generated along structural surface inside the rock mass. Structural surface imposes stress concentration, reflection enhancement of stress wave, energy absorption, energy release, pitching-in, change of break line, etc. on blasting effect. It is commonly wished to search for the most proper explosive and blasting parameters under set ore rock properties in mine production, thus to reach the composition featuring the lowest total mining production cost. Therefore, the method for lowering boulder yield in blasting for fracture-developed mine is directly associated with economic and safety benefit of mine.

ABSTRACT: It has wide distributions and large recoverable reserves of Jurassic period coal seam in China. It is difficult to maintain stability of the development roadways with long service term for Jurassic strata because there are abundant argillaceous rocks and some minerals in the high argillaceous rocks will be expanding while meeting with water. The fractures of the roadways develop well under high stress and are suitable to filling with grouting. But the poor cementing performance of cement with argillaceous rock as well as a heavy water filtration rate of cement slurry had resulted in failures of many engineering cases adopting cement grouting to reinforce this kind of roadways. In this paper, according to characters of the high argillaceous rock in Jurassic strata, a marlaceous inorganic grouting material which possesses the well cementing performance with argillaceous rocks and little filtration rate was introduced; and the grouting reinforcement mechanism, construction technique and engineering application effect about it was clarified. It will be of great significance for reinforcement and maintenance of the development roadways with high argillaceous rocks. 1 INTRODUCTION According to statistics, 60% of the proved coal reserves in China distributes in Early-Middle Jurassic period of northern North China, southern Northeast China and Northwest China, along with late Jurassic to early Cretaceous period of Northeast China and east Inner Mongolia. The period of coal forming is short and argillaceous rocks are abundant in Jurassic strata. Moreover, there are quite a few expanded minerals in some strata. So the roadways are easily to be deformed and damaged when affected by mining-induced stress. In addition, this kind of soft rock roadways has an obvious time effect. For the development roadways with long service term, serious deformations are frequently observed and part of the roadways has suffered deformation and maintenance time after time. The stability support of the development roadways really need much cost.

ABSTRACT: In the process of constructing high production and high efficiency coal mines, many new models of open-underground combined mining were adopted more and more. On the basis of open-underground combined mining of shallow horizontal thick coal in Pingshuo Mining District, three kinds of engineering geological models and numerical models were built by using two methods of physical model test and numerical simulation. Based on the stability of transportation platform of the slope, three criterions which included the maximum value of the differential settlement of the transportation platform, the convergence of settlement curves, and the connectivity of plastic zone were put forward. In order to reduce the waste of coal under the slope, boundary parameters of the open-underground mining were optimized through the contrastive analysis of the mining sequence. The engineering practice showed that optimized parameters have gained good results. In view of the facts that there are no mature experiences at home and abroad, the above-mentioned results have important theoretical meaning and popularization value for guiding the similar engineering practices. 1 INTRODUCTION There are many ways to improve labor productivity and economic benefits for coal mining enterprises, but all ways must rely on the technological progress to accelerate the construction of high yield and high efficient mine and to promote the modernization of the coal industry. As China's major mining base with hundreds of million tons of coal production, in recent years the Pingshuo Mining District has tried to use the open-underground combined mining in shallow horizontal thick coal firstly, which is a safe and new model and has achieved considerable economic benefits (Ren et al. 2007). In the process of exploitation of mineral resources in open-underground combined mining model, two aspects must be considered, one is as much as possible to prevent waste, the other is the stability of the mining slope engineering (Wang et al. 2009). At present the researches on the open-underground combined mining mainly focus on the metal mines in China, and the open-underground combined mining model was mainly used in the inclined coal seam conditions, the study on the open-underground combined mining of the shallow horizontal thick coal is very immature.

ABSTRACT: With the increase of the slope height in open-pit mines, the contradiction between the mining safety and stripping quantity becomes progressively serious. According to the analysis and calculation, the original slope angle in Gaocun Iron mine is conservative. After engineering geological investigation and rock mechanical tests, three optimization schemes were proposed. FLAC 3D numerical simulation software was used to analyze the slope stability by several indexes such as displacement and plastic zone. In addition, the safety factors were obtained according to the limit equilibrium method by Geo-slope software. Eventually, the final slope angle of the mine was determined. It showed that the optimized slope angle is improved by 3° compared with that of the former design on the whole, and the slope stability well meets the requirement of production. 1 INTRODUCTION There are a growing number of metal mines carrying on deep mining in our country, and the design of open pit slopes faces a dilemma in that situation: When the slope angle is too big, the steep slope will cause instability and failure, which is not conducive to the normal production of the mine; In contrast, the small angle will increase the stripped amount and the production costs significantly. To solve this problem, slope angle must be optimized on the premise of mining safety (Heok & Bray 1981, Duncan & Christopher 2005). Gaocun pit of Nanshan Mining Co., Ltd., is a large open pit mine, whose ore production has reached 7 million tons per year with the total mining and stripping of 18 million tons. After entering the second phase of open pit mining, the north-south length of the stope expands from 780 m to 1500 m, and the east-west width expends from 575 m to 820 m. The highest level of open pit mining is up to +90 m and the bottom elevation is down to-186m. Under the conditions of high and steep slope mining, with mining depth increases, the contradiction between security and economic production is gradually highlighted. Therefore, slope design must be optimized to ensure the production safety and increase economic efficiency.

ABSTRACT: Rock bursts are frequently encountered during the construction of deep-buried tunnels of Jinping II hydropower station, Southwest China. Investigation on the possibility of rockburst prediction during TBM and D&B advancing is necessary in order to guide the construction of tunnels and protect personnel and TBM equipments from rock bursting accidents. A real-time movable microseismic monitoring system was installed to predict rockbursts ahead of the tunnel faces. The tempo-spatial distribution evolution of microseismic events prior to and during rock bursting occurrence were recorded and analyzed in detail. The clustering of microseismic events prior to rockburst is found to be the significant indicator of rockbursting in deep rock tunneling. The successful prediction of rock bursts proved that microseismic monitoring is essential in the assessment and mitigation of rockburst hazard, minimizing the damage of equipment and personnel. Results from present study can be valuable for construction management and safety assessment of other rock engineering in high geostress. 1 INTRODUCTION With the rapid growth and development of the world's population and economics, increasing requirements of energy sources is needed. Many large-scale hydropower stations are being constructed to satisfy this aim. In particular, along with the increasing of energy sources exploiting in China, more and more large-scale hydroelectric projects such as Xiluodu, Baihetan and Jinping hydropower stations have been or are being constructed in the southwest of China (Xu eta/. 2010). Many deep-buried tunnels and underground powerhouses among these projects were, are or will be excavated. Therefore, safe and economic tunneling has been a challenging topic in the tunnel construction because of complex geological conditions such as faults, fractures, caverns and high in-situ stress. Lots of rockbursts have occurred during continuous excavation of these tunnels in the past years. Rockburst can not only seriously threatens the safety of workers and mechanical equipments, but also it can induce many problems such as overexcavation, primary support failure and construction delays, which will cause significant economic loss.

ABSTRACT: Micro fissure grouting is often applied to improve the quality of the surrounding rockmass in underground engineering. While it usually does not work in field because the cement is difficult to be injected into the rock fissure and the cement particles cannot consolidate quickly, therefore it cannot effectively strengthen the rockmass. A new grouting method DGT (Derive Grouting Technology) was presented in this paper to solve these problems. In this method, special cement with high flowability and strength in early age was developed and used as grouting material, and expelling holes were drilled around the grouting hole according to the fissures distribution to derive water out of the micro fissure and leave the cement particles inside. By controlling certain grouting pressure, the cement particles in the micro fissure accumulated and solidified quickly and the quality of rockmass could be improved in a short time, which was very important for deformation controlling of the surrounding rockmass in excavation process. In addition, acoustic testing proved the validity of the technology in an underground project. 1 INTRODUCTION Grouting is also called injection grout (Kuang, 2001), which is used for enhancing the impermeability and anti-seismicity of the grouting area. The purpose of the grouting with pressure is to fill the joints, discontinuities, void distance and cavities in the rock masses to consolidate and caulk the rock masses for reducing seepage and uplift pressure in dam foundation and related structures (Zadhesh 2014). By applying an appropriate pressure, grouting material which is of flowability in early age and adhesion before solidification was injected into the necessary position, thus the stability and safety of the structure could be improved. The grouting area are mainly soil mass and rock mass (Hao 2001). Grouting materials often include dissolvable materials and suspended materials. Dissolvable materials are mainly made up of chemical materials while suspended materials are mainly cement materials. Grouting projects often use clay, pozzolans and calces as grouting materials formerly. When Portland cement appeared in 1826, cement materials were widely used in projects (Wang 2000). When admixtures like clay, bentonite, water glass, fly ash and pozzolans were added in the Portland cement, some characters were improved (Luo 2006). By now cement grouting is usually used as one of the most important techniques for soil and rock stabilization structures (Camberfort 1967).