scholarly journals Numerical simulation on crack propagation of rock mass with a single crack under seepage water pressure

2017 ◽  
Vol 9 (10) ◽  
pp. 168781401773289 ◽  
Author(s):  
Shiliang Liu ◽  
Wenping Li ◽  
Qiqing Wang ◽  
Zhiyong Wu ◽  
Zhi Yang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Crack Propagation ◽  
Water Pressure ◽  
Seepage Water ◽  
Single Crack

scholarly journals Onsite Tests and Numerical Simulation of Broken Rock Zones in Surrounding Rocks of Seepage Roadways under Blasting

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Zhouyuan Ye ◽  
Kun Pan ◽  
Zhihua Zhou
Keyword(s):  
Numerical Simulation ◽  
Shear Failure ◽  
Mechanical Response ◽  
Water Pressure ◽  
Mining Area ◽  
Seepage Water ◽  
Blasting Vibration ◽  
Fracture Density ◽  
Iron Mine ◽  
Ground Stress

To study the influence of blasting vibration on the broken rock zone around a seepage roadway and provide guidance for design of the roadway support, the broken rock zones around rock of seepage roadways under production blasting vibration are determined by onsite tests in a mining area, Daye iron mine. During the testing process, it is found that blasting vibration causes internal cracks of surrounding rocks to initiate and develop, the fracture density increases, the acoustic wave velocity of rock mass decreases, and the broken rock zones expand. At the same time, through onsite observation, it is found that blasting vibration results in crack development and formation of a water pathway to lead to surface water into the ground. The mechanical response around rock of the seepage roadway under blasting vibration is simulated by the two-dimensional realistic fracture progress analysis calculation software (RFPA2D). It is found that internal cracks of roadway surrounding rock initiate, propagate, and join up gradually, and the fracture range is expanding under the seepage water pressure, ground stress, and cyclic loads, and the broken rock zones also expand. The results from numerical simulation are consistent with the results of onsite tests. It is also found that the tensile stress appears around some cracks, leading to part of the cracks more likely to generate shear failure under the seepage water pressure during simulation.

Research on the Deformation of Tunnel with the Influence of Seepage Water after Excavation

2014 ◽  
Vol 577 ◽  
pp. 1131-1134 ◽  
Author(s):  
Jian Jun Li ◽  
Fu Jiao Tang
Keyword(s):  
Numerical Simulation ◽  
Pore Pressure ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Ground Surface ◽  
Simulation Software ◽  
Seepage Water ◽  
Software Modeling ◽  
Geological Exploration ◽  
Tunnel Excavation

This paper discusses a tunnel whose entrance region is the main engineering background. Based on tunnel geological exploration report, we make the model. By establishing model and using numerical simulation software SIGMA/W and COMSOL to simulate the distortion in seepage condition, we find as tunnel excavation goes on, the pore water pressure of tunnel changes and it leads to infiltration of water in the tunnel, and the deformation of soil increases. The ground surface may sink if the evacuation goes on without taking actions, which is not safe for the buildings around. In case of this situation, the pore pressure of the tunnel around should be controlled from decreasing too fast. The result from our model is just like the result by monitoring measurement. The result shows the feasibility of software modeling in the prediction of tunnel seepage situation.

scholarly journals Numerical Study on Crack Propagation in Brittle Jointed Rock Mass Influenced by Fracture Water Pressure

Materials ◽  
2015 ◽  
Vol 8 (6) ◽  
pp. 3364-3376 ◽  
Author(s):  
Yong Li ◽  
Hao Zhou ◽  
Weishen Zhu ◽  
Shucai Li ◽  
Jian Liu
Keyword(s):  
Rock Mass ◽  
Crack Propagation ◽  
Numerical Study ◽  
Water Pressure ◽  
Jointed Rock ◽  
Jointed Rock Mass

scholarly journals Experimental Study of Three-Dimensional Propagation of Crack in Transparent Rock Mass

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Zhende Zhu ◽  
Yuan Tian ◽  
Xinyu Liu
Keyword(s):  
Rock Mass ◽  
Crack Propagation ◽  
Pore Pressure ◽  
Mechanical Stability ◽  
Water Pressure ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Peak Strength ◽  
Primary Crack ◽  
Good Transparency

Three-dimensional crack propagation in a rock mass was investigated using a specifically designed material with good transparency and elastoplasticity. The material has properties that are similar to those of the nature sandstone. Hydromechanical tests were conducted to simulate pore pressure in the paper to study the influence of the angle of the primary crack and the water pressure on the mechanical stability of the rock mass. The results indicated that the water pressure accelerated the crack propagation and the failure of the samples. The influence of water pressure on initiation crack strength was not significant but had a significant impact on the peak strength. With the increase in water pressure, the crack initiation strength, penetration strength, and peak strength all decrease in varying degrees. The penetration strength did not only depend on the pore pressure but also exhibited high sensitivity to the inclination angle of the primary crack. The extended finite element method is used to simulate hydraulic fracturing. The simulation results show that the stress near the tip exhibited a cycle of energy accumulation-crack expansion-stress relaxation as the crack expanded, and this finding was consistent with Griffith’s energy theory.

scholarly journals Analysis of Seepage and Displacement Field Evolutionary Characteristics in Water Inrush Disaster Process of Karst Tunnel

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Yongbiao Lai ◽  
Shuo Li ◽  
Jiaqi Guo ◽  
Zhengguo Zhu ◽  
Xin Huang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Lateral Pressure ◽  
Water Pressure ◽  
Water Inrush ◽  
Pressure Coefficient ◽  
Karst Tunnel ◽  
Seepage Pressure ◽  
Lateral Pressure Coefficient ◽  
Tunnel Depth

Water inrush of tunnel is one of the most common geological disasters in the karst strata in China. Aiming at the rock mass with a quasi-masonry structure in the water-resistant strata between karst cavity with high pressure water and tunnel and the shortcomings of theoretical analysis, traditional numerical simulation, and physics model test for describing and reflecting this special structure of rock mass, a Discrete Element Method considering the fluid-solid coupling effect and structural characteristics of rock mass is employed to study the disaster process of water inrush and the evolutionary characteristics of catastrophe information like seepage pressure and displacement under condition of different karst water pressure, tunnel depth, and lateral pressure coefficient. Research results show the following: (1) the seepage pressure and displacement increase with the increase of kart water pressure. The seepage pressure demonstrates a decreasing state from top to bottom in water-resistant strata, and the time of arrival to a stable value for the seepage pressure shows the time effect. (2) The larger the tunnel depth, the greater the coalescence and distribution scope of fracture and the more likely the water inrush to occur in a short time. The stability of water-resistant strata decreases on the whole with the growth of tunnel depth. (3) The increase of lateral pressure coefficient can restrain the fracture development and strengthen stability. The fracture state is significantly influenced by a lateral pressure coefficient. The results of numerical simulation are consistent with those obtained by a model test. Research and analysis based on energy are a promising train of thought for studying the disaster process of water inrush in a karst tunnel.

scholarly journals The Monitoring-Based Analysis on Deformation-Controlling Factors and Slope Stability of Reservoir Landslide: Hongyanzi Landslide in the Southwest of China

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Bing Han ◽  
Bin Tong ◽  
Jinkai Yan ◽  
Chunrong Yin ◽  
Liang Chen ◽  
...  
Keyword(s):  
Water Level ◽  
Water Pressure ◽  
Monitoring Program ◽  
Significant Risk ◽  
Controlling Factors ◽  
Seepage Water ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Reservoir Area ◽  
Reservoir Landslide

Reservoir landslide is a type of commonly seen geological hazards in reservoir area and could potentially cause significant risk to the routine operation of reservoir and hydropower station. It has been accepted that reservoir landslides are mainly induced by periodic variations of reservoir water level during the impoundment and drawdown process. In this study, to better understand the deformation characters and controlling factors of the reservoir landslide, a multiparameter-based monitoring program was conducted on a reservoir landslide—the Hongyanzi landslide located in Pubugou reservoir area in the southwest of China. The results indicated that significant deformation occurred to the landslide during the drawdown period; otherwise, the landslide remained stable. The major reason of reservoir landslide deformation is the generation of seepage water pressure caused by the rapidly growing water level difference inside and outside of the slope. The influences of precipitation and earthquake on the slope deformation of the Hongyanzi landslide were insignificant.

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