FANG Ping-liang, SHAO Li-ming>, ZENG Zhi-guo, LI Ning. Study on the Stress-Strain Relationship of Gas-Bearing Coal Rock Under Variable Confining Pressure-Pore Pressure Conditions[J]. Applied Mathematics and Mechanics, 2014, 35(7): 768-776. doi: 10.3879/j.issn.1000-0887.2014.07.006
 Citation: FANG Ping-liang, SHAO Li-ming>, ZENG Zhi-guo, LI Ning. Study on the Stress-Strain Relationship of Gas-Bearing Coal Rock Under Variable Confining Pressure-Pore Pressure Conditions[J]. Applied Mathematics and Mechanics, 2014, 35(7): 768-776.

# Study on the Stress-Strain Relationship of Gas-Bearing Coal Rock Under Variable Confining Pressure-Pore Pressure Conditions

##### doi: 10.3879/j.issn.1000-0887.2014.07.006
Funds:  The National High-tech R&D Program of China (863 Program)(2013AA064902)
• Rev Recd Date: 2014-05-19
• Publish Date: 2014-07-15
• Under different confining pressure-pore pressure conditions, the numerical method was used to simulate the failure process and the stress-strain relationship of gas-bearing coal rock. A micro-heterogeneous elastic-brittle model based on elasticity theory and failure theory was constructed with the influences of confining pressure and pore pressure considered. An FEM program was developed partially out of the FEPG software, to simulate the deformation and failure behaviors of the gas-bearing coal rock under variable confining pressure-pore pressure conditions. The results show that the coal rock becomes ductile with increase of the confining pressure, and the carrying capacity is enhanced, while the influence of the pore pressure is just opposite. The simulation results quantitatively agree well with the experimental results, which, to a certain extent, proves accuracy of the proposed constitutional model and effectiveness of the FEM program.
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