变围压-孔压条件下含气煤岩应力应变关系研究

房平亮; 邵黎明; 曾志国; 李宁

doi:10.3879/j.issn.1000-0887.2014.07.006

变围压-孔压条件下含气煤岩应力应变关系研究

doi: 10.3879/j.issn.1000-0887.2014.07.006

¹中国石油勘探开发研究院, 北京 100083;²中国地质大学(北京) 能源学院, 北京 100083;³华北油田公司采油工程研究院, 河北任丘 062552

基金项目: 国家高技术研究发展计划(863计划)项目(2013AA064902)

详细信息

作者简介:
房平亮（1983—），男，山东聊城人，博士生（E-mail: fpl@petrochina.com.cn）

中图分类号: O39
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- 被引次数: 0
出版历程
- 收稿日期: 2013-12-12
- 修回日期: 2014-05-19
- 刊出日期: 2014-07-15

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

¹Research Institute of Petroleum Exploration & Development (RIPED), PetroChina, Beijing 100083, P.R.China;²School of Energy Resources, China University of Geosciences, Beijing 100083, P.R.China;³Petroleum Production Engineering Research Institute of Huabei Oilfield Company,Renqiu, Hebei 062552, P.R.China

Funds: The National High-tech R&D Program of China (863 Program)(2013AA064902)

摘要

摘要: 为研究围压及孔压对含气煤岩本构关系的影响,基于弹性力学及破坏理论，建立了细观非均匀弹脆性模型，利用FEPG数值模拟软件,编制了有限元计算程序，用数值方法模拟了含气煤岩体在变围压孔压条件下的变形及破坏规律.结果表明，围压增大时，煤岩体由脆性逐渐转呈柔性,且承载能力有所增强，而孔压的影响则恰好相反.将数值模拟结果分别与变围压、变孔压实验数据进行了对比，两者基本相符，充分验证了力学模型的适用性及计算程序的正确性.
- 围压 /
- 孔压 /
- 细观非均匀性 /
- 弹脆性模型 /
- 应力应变关系 /
- 脆性 /
- 柔性
Abstract: 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.
- confining pressure /
- pore pressure /
- micro-heterogeneous /
- elastic-brittle model /
- stress-strain relationship /
- brittleness /
- ductility

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参考文献(12)

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