Stabality Analysis of Deep Roadway Based on Coupled Thermo-Hydro-Mechanical Behaviors

2012 ◽  
Vol 594-597 ◽  
pp. 2564-2568
Author(s):  
Qi Feng Guo ◽  
Fen Hua Ren ◽  
Zhao Cai Zhang
Keyword(s):  
Temperature Field ◽  
Numerical Model ◽  
Stress Field ◽  
Constitutive Relation ◽  
Mechanical Behaviors ◽  
Seepage Field ◽  
Mechanical Equation ◽  
Rock Temperature ◽  
Ground Stress ◽  
The Stability

In order to research the stability of excavation in deep mines under high ground stress, high rock temperature and high karst hydraulic, the interaction of stress field, seepage field and temperature field are discussed through basic constitutive relation, seepage equation, thermometer equation and coupled thermo-hydro-mechanical equation. A numerical model was built to simulate the excavation of deep roadway. The result shows that the simulated ground stress based on three fields coupled is much closer to the field measured value and the change of stress and displacement caused by the excavation are limited which is about same as the later monitoring.

The Study of Coupling Law of Stress Field / Seepage Field in Impermeable Stratum Medium

2010 ◽  
Vol 171-172 ◽  
pp. 125-130
Author(s):  
Jing Yan Li
Keyword(s):  
Plastic Deformation ◽  
Porous Medium ◽  
Stress Field ◽  
Rock Mechanics ◽  
Distribution Patterns ◽  
Seepage Field ◽  
Field Coupling ◽  
Ground Stress ◽  
The Stability ◽  
Element Technique

According to the basic theory of rock mechanics, fluid mechanics in porous medium, geologic mechanics, calculated mechanics and fluid-solid coupling seepage, a mathematical and numerical model of seepage field and stress field coupling is developed in porous medium and a computer program is designed with the method of finite element technique. The Coupling Law of depressurizing exploitation Seepage field /Stress field in porous medium is studied. By the method of numerical simulation the variation law of stress-strain with time and space around borehole of impermeable rock medium, variety law of rock physical properties parameters is studied. It can be seen from result that development and deformation of borehole elastic area mainly affected by ambiequal ground stress value, difference of ambiequal ground stress and rock material properties so on. But for the nonlinear rock medium, material plastic deformation is a key mechanics parameter closely related to distribution patterns of borehole stress. Therefore, based on rock mechanics experiment，it is necessary to further consider influence of plastic deformation mechanism to the stability of the borehole.

Numerical Simulation of Interaction of Cut-Off Wall and Earth-Rock Dam in the Reinforcement Project

2012 ◽  
Vol 170-173 ◽  
pp. 2181-2187
Author(s):  
Jiang Lin Gao ◽  
Zhi Gang Yang ◽  
Shu Wang Yan
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Stress Field ◽  
Design Method ◽  
Construction Technology ◽  
Seepage Field ◽  
Coupled Numerical Model ◽  
Coupling Calculation ◽  
Design Calculations ◽  
Comprehensive Study

Concrete cut-off wall has been widely used in the reinforcement project of earth-rock dam. Its design method and construction technology are comparatively mature, but comprehensive study of interaction of cut-off wall and dam is few, especially for the case that new cut-off wall built in earth-rock dam. In order to discuss the principal and law of interaction of cut-off wall and earth-rock dam in the reinforcement project, seepage field and stress field coupled numerical model was established by using ABAQUS. The contact between the wall and the dam together with the coupling of the stress and the seepage were taken into account in the model. Through coupling calculation of typical earth-rock dam project, the results show that, the model is feasible to simulate the interaction of cut-off wall and earth-rock dam, and the method can provide reference for design calculations of cut-off wall in reinforcement project of earth-rock dam.

scholarly journals On distribution characteristics of the temperature field and gas seepage law of coal in deep mining

2020 ◽  
Vol 24 (6 Part B) ◽  
pp. 3923-3931
Author(s):  
Ming-Qing Yang ◽  
He-Ping Xie ◽  
Ming-Zhong Gao ◽  
Zhi-Qiang He ◽  
Cong Li ◽  
...  
Keyword(s):  
Temperature Field ◽  
Stress Field ◽  
Coal Mining ◽  
Coal Mine ◽  
Temperature Fields ◽  
Seepage Field ◽  
Element Analysis ◽  
Safety Control ◽  
Working Face ◽  
Gas Seepage

The study of gas seepage under the condition of multifield coupling has always been an important topic in coal mining. Based on the theory of multifield coupling and the research method of numerical simulation, the influences of the stress and temperature fields on the seepage field under the conditions of deep coal mining are studied. With the example of the J15-31030 deep working face from mine No. 12 in the Pingdingshan Coal Mine, modeling and finite element analysis are carried out. The influences of the mining stress field and temperature field on the gas seepage field are preliminarily revealed. The results show that the closer to the working face, the greater the velocity of the seepage field is, and the greater the gradient of velocity change. There is a clear negative correlation between the mining stress field and the permeability of the seepage field. The larger the excavation length is, the greater the change gradient of the rock permeability near the working face is. The temperature field has a significant impact on the adsorbed gas in the seepage field. These research results provide the corresponding basis for the safety control and effective mining of coal mine gas.

scholarly journals Study on the Stability of a Transition Section from Soft to Hard Surrounding Rock Based on the Solid-Fluid Coupling Effect

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Qizhi Hu ◽  
Yixin Tang ◽  
Zhigang Ding
Keyword(s):  
Stress Field ◽  
Displacement Field ◽  
Coupling Effect ◽  
Surrounding Rock ◽  
Guizhou Province ◽  
Seepage Field ◽  
Support Structure ◽  
Transition Section ◽  
Design Values ◽  
The Stability

To study the stability of a transition section of a tunnel from soft to hard surrounding rock under seepage conditions, FLAC3D software was used to numerically simulate the transition section of the Laomushan Tunnel from the Shiqian to Yuping (Dalong) Expressways in Guizhou Province, China, and to explore different working conditions. The characterization of the tunnel seepage field, stress field, and displacement field and the analysis of the force of the primary lining support structure describe the influence of the seepage field on the stress field distribution and displacement field changes. The reliability of the calculation results is verified by comparison with displacement measurements collected during field monitoring. The design values of the primary support structure parameters of the transition section from soft to hard surrounding rock of the Laomushan Tunnel basically met the strength requirements. The research results provide references for the design and construction of similar projects.

Groundwater flow simulation and its application in GaoSong ore field, China

2018 ◽  
Vol 10 (2) ◽  
pp. 276-284 ◽  
Author(s):  
Gang Chen ◽  
Shiguang Xu ◽  
Chunxue Liu ◽  
Lei Lu ◽  
Liang Guo
Keyword(s):  
Numerical Model ◽  
Flow Field ◽  
Groundwater Flow ◽  
Mine Water ◽  
Permeability Coefficient ◽  
Water Inrush ◽  
Seepage Field ◽  
Groundwater Seepage ◽  
Calculation Results ◽  
Groundwater Flow Field

Abstract Mine water inrush is one of the important factors threatening safe production in mines. The accurate understanding of the mine groundwater flow field can effectively reduce the hazards of mine water inrush. Numerical simulation is an important method to study the groundwater flow field. This paper numerically simulates the groundwater seepage field in the GaoSong ore field. In order to ensure the accuracy of the numerical model, the research team completed 3,724 field fissure measurements in the study area. The fracture measurement results were analyzed using the GEOFRAC method and the whole-area fracture network data were generated. On this basis, the rock mass permeability coefficient tensor of the aquifer in the study area was calculated. The tensor calculation results are used in the numerical model of groundwater flow. After calculation, the obtained numerical model can better represent the groundwater seepage field in the study area. In addition, we designed three different numerical models for calculation, mainly to explore the influence of the tensor assignment of permeability coefficient on the calculation results of water yield of the mine. The results showed that irrational fathom tensor assignment would cause a significant deviation in calculation results.

scholarly journals Evolution regularity of temperature field of active heat insulation roadway considering thermal insulation spraying and grouting: A case study of Zhujidong Coal Mine, China

2021 ◽  
Vol 40 (1) ◽  
pp. 151-170
Author(s):  
Weijing Yao ◽  
Happiness Lyimo ◽  
Jianyong Pang
Keyword(s):  
Sensitivity Analysis ◽  
Temperature Field ◽  
Thermal Insulation ◽  
Wall Temperature ◽  
Heat Insulation ◽  
Surrounding Rock ◽  
Rock Temperature ◽  
Grouting Materials ◽  
Zone Radius ◽  
Thermal Conductivities

Abstract To study the active heat insulation roadways of high-temperature mines considering thermal insulation and injection, a high-temperature −965 m return air roadway of Zhujidong Coal Mine (Anhui Province, China) is selected as a prototype. The ANSYS numerical simulation method is used for the sensitivity analysis of heat insulation grouting layers with different thermal conductivities and zone ranges and heat insulation spray layers with different thermal conductivities and thicknesses; thus, their effects on the heat-adjusting zone radius, surrounding rock temperature field, and wall temperature are studied. The results show that the tunneling head temperature of the Zhujidong Mine is >27°C all year round, consequently causing serious heat damage. The heat insulation circle formed by thermal insulation spraying and grouting can effectively alleviate the disturbance of roadway airflow to the surrounding rock temperature field, thereby significantly reducing the heat-adjusting zone radius and wall temperature. The decrease in the thermal conductivities of the grouting and spray layers, expansion of the grouting layer zone, and increase in the spray layer thickness help effectively reduce the heat-adjusting zone radius and wall temperature. This trend decreases significantly with the ventilation time. A sensitivity analysis shows that the use of spraying and grouting materials of low thermal conductivity for thermal insulation is a primary factor in determining the temperature field distribution, while the range of the grouting layer zone and the spray layer thickness are secondary factors. The influence of the increased surrounding rock radial depth and ventilation time is negligible. Thus, the application of thermal insulation spraying and grouting is essential for the thermal environment control of mine roadways. Furthermore, the research and development of new spraying and grouting materials with good thermal insulation capabilities should be considered.

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