.... The monitoring results show that the formula proposed in this paper can effectively monitor the displacement change of rock strata. At the same time, the coupling between optical fiber and rock determines the accuracy of the measurement results. The better the coupling between optical fiber and rock, the more...

... and hard rock strata in the fields of oil, gas, coal and geological exploration because of their high penetration rate and long service life [1-4]. The boreholes left are ideal to dispose the nuclear waste due to its advantages in the robust isolation from the biosphere, low cost, high speed...

... profile of Well X. Through the analysis of the drillability profile and drilling conditions, it is believed that with the increase of formation depth, the drillability class value of formation increases, and the drillability of formation becomes worse. Because the fluctuation of the strata drillability...

...-induced tremor occurrence using theoretical analysis, numerical simulation, and focal mechanism. The study found four inferior strata and a primary key stratum in the overlying strata on LW3102, and discovered that upon breaking the key stratum movement releases a large amount of energy thereby causing...

... impounding. The hydraulic head varies with a good correlation with the reservoir water level. This abnormal rise of hydraulic head can be attributed to higher permeability of strata where small-scale karst pipes and conduits are developed. In this study, an inverse modelling procedure combined orthogonal...

... Abstract Strata movement and ground subsidence caused by mining have a significant influence on the safety and stability of the goaf. By taking the mesoscopic heterogeneity of rock masses into account, the discontinuous deformation and displacement (DDD) method was applied to simulate...

... direction was perpendicular to the tunnel axis. The acceleration data were analysed to explain the discrepant seismic responses of the tunnel buried in different strata. The seismic performance of the tunnel was evaluated through three observed data: the sectional deformation, the extension of joints...

... Abstract The overlying strata is often destroyed in large-scale during shallow coal seam mining, and the sliding instability of the caved roof seriously threatens the safety of the mining field. Based on the monitoring data of the roof weighting of a typical shallow coal mining, the load...

... Abstract Ground control condition is one of the most important issues in mechanized longwall mining. The Alpu lignite field in Turkey presents a challenging situation because of its thick, weak and clay content surrounding strata. The purpose of this study is to figure out the ground control...

.... Similarly, the classifications of strata, rock hardness and degree of weathering, which are derived from the results of drill core observation, tend to be subjective and tend to depend on the abilities of the engineers involved in determining them. These subjective aspects sometimes result in differences...

... strata sensor node strata roof health status media converter coal pillar bord processor pillar Sensor Network base station vibration Real-Time Roof Health Status Monitoring System in Depillaring Section of a Bord & Pillar Coal Mine Using Multi-hop Wireless Sensor Network (MWSN) Sudipta...

... in the country. Actual cause of the problem is still being investigated and is found difficult to be concluded. However, as per core analysis results, a good understanding of the nature of overlying strata might have guided the approach for a better pattern of the pillar extraction and the chance of failure...

... Abstract: Mining subsidence of overlying strata is a three-dimensional problem which has a large calculation scope. The present numerical methods have given answers to rock mechanics aspect, however, the answers are inadequate, especially on conditions of greater inclination and thick...

... Synopsis: Tunneling through Himalayan ranges is always a challenging job especially in the weak rock formation with high ingress of water creating flowing ground conditions. Occurrence of extremely poor strata in the form of shear zones or thrust zones or highly jointed rock mass while...

... reinforcement strategy application resin extraction application reservoir geomechanics reinforcement strategy application potential roof-fall area estimation support safety factor Reservoir Characterization grant-in-aid project roof strata safety factor strata accident India ISRM International...

... Engineering drilling fluid selection and formulation Upstream Oil & Gas lignite water management bottom bench toe strength parameter drilling fluid formulation aquifer circular mode average value geo-technical investigation model 2 variation investigation piezometric surface strata...

... was adopted. internal force pu xi pipe strata pu dong deformation tunnel structure huang pu river grout tunnel safety Shanghai closer tunnel pipe tunnel river shaft construction right side The monitoringfor the effect of pipe jacking on another closer tunnel HUANG HONGWEI~,YANG...

... finite element models, which include a 600-ton two-leg real size shield model. It was found that, stress distribution in coal strata was greatly altered due to the existence of large-size sandstone channel in the roof. Cousequently, shield loading, roof sagging, face closure, floor heave, and floor...

... ABSTRACT Fengdian high cutting slope is a typical one in Sichuan section of the expressway from Chengdu to Shanghai. It is 78.5 meters high. The slope consists of interbedded strata of rock mass of purplish red mudstone and grey-brown arkosic sandstone of Jurassic age. The mudstone is soft...

... ABSTRACT: In Tertiary strata men, plane slip along weak strata is predominated as the slope failure has several patterns, and it may cause instable trouble in cutting slope frequently. The relationship between the strike and dip of strata and orientation of slope is much important and controls...