基于一种应力不变量组合的岩石强度准则  

Strength Criterion of Rock Based on a Stress Invariant Combination

作　　者：李文培[1,2] 邓宏见[3] 王明洋 范鹏贤 

机构地区：[1]海军工程设计研究局,北京100070 [2]爆炸冲击防灾减灾国家重点实验室,南京210007 [3]中国工程物理研究院结构力学研究所,四川绵阳621900

出　　处：《地下空间与工程学报》2012年第5期997-1001,1025,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB732003);国家杰出青年科学基金资助项目(50825403);国家自然科学创新研究群体科学基金(51021001);水利部公益性行业科研专项项目(2010001009)

摘　　要：针对深部高地应力条件下岩石的破坏机制,建立起一个基于一种应力不变量组合的岩石非线性强度准则。这个应力不变量组合将任意应力状态分解成三个部分:一部分表示最大剪切状态,另一部分代表静水压力状态,最后一部分补充中间主应力的影响。它能解释粘性和塑性介质不可回复变形模型中能量耗散(弥散)的物理机理。该强度准则考虑岩石的拉伸破坏,可同时描述岩体的剪胀或剪缩破坏,其破坏面可以是闭合的也可以是张开的,其子午线能反映高应力状态下的岩石非线性。与两种典型应力状态的试验数据进行了比较,符合较好。A nonlinear strength criterion based on a certain stress invariant combination was established to study the failure mechanism of rock in high-stress condition at great depth. Each stress state could be decomposed into three parts with the stress invariant combination ： one was the maximum shear stress state ; another was the hydrostatic stress state and the last one supplemented effect of intermediate principal stress. This combination might be used to explain physical mechanism of energy dissipation in irreversible deformation processes of viscidity and plasticity medium. The strength criterion has taken the rock tensile failure into account, it also considered shear dilatancy damage and shear reduction damage of the rock, which failure plane might he close or open. Meridian line of the strength criterion could reflect nonlinear character of rock in high-stress condition. The computing results with the criterion were compared with data from two kinds of typical rock tests, and the former matched well with the latter.

关 键 词：非线性 应力不变量组合 强度准则 中间主应力 

分 类 号：TU45[建筑科学—岩土工程]