..., and the sandstone drillability experiment was carried out under simulated bottom hole conditions. The relationship between the characteristics of pore structure and drillability was analyzed by statistical method. The experiment results show that sandstone's pore structure characteristics have an important effect...

... comparing with the experimental calculation results of fracture seepage, it is found that the AFM calculation results are in good agreement. Using the method of solving the NS equation, the seepage calculations were performed for two typical fracture models with multiple boundary conditions. After...

... subjected to desiccation or freezing-thawing processes. In this study, the authors investigate the dynamic stability of rock slope consisting of hexagonal blocks through model tests on shaking table. Experiments indicated that toppling or sliding failures, which may be of active or passive modes occur...

... of cohesion and tension strength on the macro strength. Figure 3. Calibration results with experiments. This study focused on soft rock engineering, with the given basic parameters based on experimental results of the typical soft rocks in southern China. The experiments were carried out in a previous study...

... The law of fluid flow in shear fractures provides a basis. 2. Basic composition of the experimental system The true triaxial shear-self-supporting crack diversion experiment device is mainly composed of five parts: vertical loading system, horizontal shear loading system, hydraulic servo loading system...

... saturated with distilled water for more than one month. (a) (b) (c) Figure 2. (a) Siliceous mudstone sample, (b) rock sample attachment, and (c) a rock sample in the assembly showing LVDTs, two fluid lines, and the silicon sealant-coated rock sample. 2.3. Experimental procedure In this experiment, we...

... and Environmental Science 861 (2021) 052111 doi:10.1088/1755-1315/861/5/052111 distribution curve. 2. Engineering background 2.1.Experimental materials and procedures The three soil samples used in this experiment are the silty clay in Beijing, the red clay in Shaanxi and the mudstone (mudstone-hard soil...

... 12 14 16 Strain Figure 2. Stress strain curves of numerical experiment and laboratory test Figure 3. Macro performance of numerical experiment and laboratory test Table 2. Comparison of experimental mechanical parameters E 103MPa MPa Numerical Simulation 8.4 10.9 Laboratory Test 8.5 10.8 Based...

... of understanding, there is no clear conclusion. Moreover, the research on multi-cluster fracture propagation mainly focuses on the numerical simulation method, while the physical experiment simulation research, especially the experimental research on outcrop rock samples is less. In this paper, by carrying out...

... water-rock mass coupling was studied, and the 3D reconstruction of the fracture surface was carried out after the experiment. The influence of the roughness degree of fracture surface on the permeability of fractured rock mass is investigated. Based on the experimental results, the non-darcy flow...

... on the surface of soil shown as figure 3. More specific model experimental design and procedures has been addressed in details in our previously published paper [14]. To find out the water migration and deformation characteristics of composite strata under seepage, two experiments with seepage velocity of 0.5 m...

... sharply. The prediction was proven by the experimental result. Vertical cracks have not been found on the PZD-3 column. In the final stage of the experiment, very fine vertical cracks are found on the PZD-4 column. 7. Design recommendation for eccentric beam-column joint with haunch beams Experimental...

... vibration safety control. 2. Blasting experiments at Baihetan Hydropower Station 2.1. Experimental design Baihetan Hydropower Station is located in the lower reaches of the Jinsha River. It is the second step of the four cascade hydropower stations, including Wudongde, Baihetan, Xiluodu, and Xiangjiaba...

.... The following is the parameters of one fracturing experiment : Table 3.1. Setting of experimental parameters. Number 01 Natural fracture density 9% In-situ stress/MPa 20/15/11 Difference between maximum and minimum in-situ stress/MPa 4 Delivery capacity 10ml/min Viscosity/ mPa s 10 The experimental pressure...

... on the growth of a dirt layer on a heat exchanger. The experimental results showed that the surface area and thickness of the scale layer decreased as the flow velocity increased, and the average flow velocities through the heat exchanger in the experiment were 2.7, 3.8, and 5 m/s. Zhan et al. (2016...

... the cartridge heater, and several acceleration transducers were installed on the end faces of the coal block to detect AE events. Figure 1 shows the experimental setup of the coal heating experiment. Tables 1 and 2 show the industrial and elemental analysis values of the coal and mechanical properties...

... vibration amplification of high rock slope As the full size experiment is very expensive and time-consuming, and the working condition of experiment is limited because of the environment. On the other hand, numerical method, derived from sound mechanical principles and validated against experimental data...

.... Experimental phenomenon of test A Experimental phenomenon Front view Side view Rainfall was 0 triggered and the experiment started. Tiny cracks on the 30 back of the slope and slope creep were observed. Small cracks on the back of the slope were observed and 70 the sliding deformation of the slope was 1.0 2.0...

... of power supply. Another very important issue is how to monitor displacement and additional parameters such as acoustic emissions, temperature and humidity during experiments for long durations. The Rock Mechanics Laboratory of the University of the Ryukyus has recently improved their experimental...

.... Experimental program 2.1. Raw materials and sample preparation The similar materials of engineering rock mass are composed of aggregate, binder, and regulator. In this experiment, barite powder and quartz sand were used as the main aggregates, gypsum powder and water were used as binders, and washing liquid...