压密试验中破碎岩石压密特性的本构方程及数值模拟分析

 在以往室内压密试验的基础上，利用变量依存性本构方程对压密试验中试样的压密特性进行数值模拟。本构方程中，假定岩石破坏速度随着破坏接近度Sv的增加而增大；将破坏接近度扩展到三维应力状态，且在破坏接近度为负值的区域，引进强度恢复参数Hp(Hp= –Sv)；通过假定压密岩石强度的恢复程度依赖于恢复参数Hp，对本构方程进行修正。从数值模拟结果可以看出：在压密过程中依存性变量? 逐渐变小时，修正后的本构方程可以描述压密过程中岩石的性质；尽管还需进一步研究和完善修正本构方程，但其具有较强的应用前景，能够较好地描述压密试验中破碎岩石的压密特性，解释地下建筑物围岩开挖扰动区的恢复现象。

STUDY OF DEFORMATION AND FAILURE MODEL FOR DEEP ROCK MASS AND ITS NUMERICAL METHOD

A discontinuous elastoplastic model for plane strain was presented to depict rock shear strain localization phenomenon;and the classical slip line field theory is used as a frame in the model.The discontinuities of displacement field on slip lines are described with an assemblage of continuous functions;and control equations in the model are deduced from physical law in local orthogonal curvilinear coordinates.The deformation process is divided into three phases:elastic,plastic and post-peak shear localizat...