Numerical simulation for tunnel excavation in stratified rock mass by FLAC3D

2009 ◽  
Author(s):  
Zi-qiang Zhu ◽  
Hai-qing Li ◽  
Qun-yi Liu ◽  
Xian-qi He
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Tunnel Excavation ◽  
Stratified Rock ◽  
Stratified Rock Mass

Computer Aided Design for Safety Analysis of Excavation in Stratified Rock Tunnel

2011 ◽  
Vol 71-78 ◽  
pp. 3197-3200
Author(s):  
Shu Yun Wang ◽  
Xiong Gang Xie ◽  
Xi Chen
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Computer Aided Design ◽  
Rapid Development ◽  
Deformation Analysis ◽  
Simulation Methods ◽  
Computer Technique ◽  
Numerical Simulation Methods ◽  
Stratified Rock ◽  
Stratified Rock Mass

Stratified rock mass is widely existing in tunnel engineering. The most relevant feature of stratified rocks is the occurrence of very persistent bedding, which makes the rock-mass highly non-isotropic. A number of techniques for designing underground excavations in stratified media have been described in the literature, like theoretical method and laboratory test, which can only be applied in analyzing the problem with simple geometry and costs much expense. Recently, with rapid development of computer technique, numerical simulation methods have been widely applied in engineerin. Among all the numerical simulation methods, fast lagrangian explicit finite difference code of continua (FLAC3D) is widely used to solve practical problems, especially in field of elasto-plastic characteristic, large deformation analysis and construction procedure. So in the present paper, numerical simulation for the failure mode of stratified rock mass after tunnel excavation is done by FLAC3D, which can give further guidance to understand the anisotropic characteristic of stratified rock mass.

Application of ABAQUS in Surrounding Rock Stability Analysis of Shallow Large Cross-Section Tunnel

2015 ◽  
Vol 777 ◽  
pp. 8-12 ◽  
Author(s):  
Lin Zhen Cai ◽  
Cheng Liang Zhang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Strong Support ◽  
Surrounding Rock ◽  
Tunnel Engineering ◽  
Tunnel Excavation ◽  
Rock Stability ◽  
Rock Bolting ◽  
Excavation Support ◽  
The Stability

HuJiaDi tunnel construction of Dai Gong highway is troublesome, the surrounding-rock mass give priority to full to strong weathering basalt, surrounding rock integrity is poor, weak self-stability of surrounding rock, and tunnel is prone to collapse. In order to reduce disturbance, taking advantage of the ability of rock mass, excavation adopt the method of "more steps, short footage and strong support". The excavation method using three steps excavation, The excavation footage is about 1.2 ~ 1.5 m; The surrounding rock bolting system still produce a large deformation after completion of the first support construction, it shows that the adopted support intensity cannot guarantee the stability of the tunnel engineering. Using ABAQUS to simulate tunnel excavation support, optimizing the support parameters of the tunnel, conducting comparative analysis with Monitoring and Measuring and numerical simulation results, it shows that the displacement - time curves have a certain consistency in numerical simulation of ABAQUS and Monitoring and Measuring.

Numerical Simulation of Rock Mass Damage Evolution During Deep-Buried Tunnel Excavation by Drill and Blast

2014 ◽  
Vol 48 (5) ◽  
pp. 2045-2059 ◽  
Author(s):  
Jianhua Yang ◽  
Wenbo Lu ◽  
Yingguo Hu ◽  
Ming Chen ◽  
Peng Yan
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Damage Evolution ◽  
Tunnel Excavation ◽  
Drill And Blast

scholarly journals A Thermal Effect Model for the Impact of Vertical Groundwater Migration on Temperature Distribution of Layered Rock Mass and Its Application

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1285
Author(s):  
Haifeng Lu ◽  
Yuan Zhang ◽  
Guifang Zhang ◽  
Manman Zhang
Keyword(s):  
Thermal Conductivity ◽  
Rock Mass ◽  
Temperature Distribution ◽  
Temperature Curve ◽  
Geothermal Water ◽  
Layered Rock ◽  
Effect Model ◽  
Layered Rock Mass ◽  
Stratified Rock ◽  
Stratified Rock Mass

On the basis of the one-dimensional heat conduction–convection equation, a thermal effect model for vertical groundwater migration in the stratified rock mass was established, the equations for temperature distribution in layered strata were deduced, and the impacts of the vertical seepage velocity of groundwater and the thermal conductivity of surrounding rocks on the temperature field distribution in layered strata were analyzed. The proposed model was employed to identify the thermal convection and conduction regions at two temperature-measuring boreholes in coal mines, and the vertical migration velocity of groundwater was obtained through reverse calculation. The results show that the vertical temperature distribution of the layered rock mass is subject to the migration of the geothermal water; the temperature curve of the layered formation is convex when the geothermal water travels upward, but concave when the water moves downward. The temperature distribution in the stratified rock mass is also subject to the thermal conductivity of the rock mass; greater thermal conductivity of the rock mass leads to a larger temperature difference among regions of the rock mass, while weaker thermal conductivity results in a smaller temperature difference. A greater velocity of the vertical migration of geothermal water within the surrounding rock leads to a larger curvature of the temperature curve. The model was applied to a study case, which showed that the model could appropriately describe the variation pattern of the ground temperature in the stratified rock mass, and a comparison between the modeling result and the measured ground temperature distribution revealed a high goodness of fit of the model with the actual situation.

scholarly journals FEATURES OF PROPAGATION OF HYDRAULIC FRACTURES IN STRATIFIED ROCK MASS

2021 ◽  
Vol 2 (4) ◽  
pp. 190-197
Author(s):  
Evgeny N. Sher
Keyword(s):  
Rock Mass ◽  
Hydraulic Fracturing ◽  
Hydraulic Fractures ◽  
Fluid Viscosity ◽  
External Compression ◽  
Governing Factor ◽  
Stress States ◽  
Stratified Rock ◽  
Stratified Rock Mass ◽  
Tension Strength

In hydraulic fracturing commonly used in mining, it is important to determine the shapes and sizes of created fractures. The governing factor in this case is the structure of rock mass which is often stratified. This study analyzes the influence of strengths of the layers and their stress states on the shapes of the growing fractures. Numerical modeling shows that in hydraulic fracturing with low-viscous fluids, fractures grow mostly in a layer having lower tension or compression strengths. The calculations carried out for the analyzed cases provide the values of tension strength and external compression for hydraulic fractures to grow only in one layer. It is shown that the increase in the breakdown fluid viscosity weakens this effect.

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