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.
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 pres- sure conditions. The results show that the coal rock becomes ductile with increase of the confi- ning 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 effective- ness of the FEM program.
出处
《应用数学和力学》
CSCD
北大核心
2014年第7期768-776,共9页
Applied Mathematics and Mechanics
基金
国家高技术研究发展计划(863计划)项目(2013AA064902)~~
关键词
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
confining pressure
pore pressure
micro-heterogeneous
elastic-brittle model
stress-strain relationship
brittleness
ductility
