摘要
采用损伤力学和统计理论的单元本构模型,探讨深部岩体巷道围岩破坏规律,利用岩石破裂过程分析软件RFPA^(2D),对深部岩体中的圆形巷道的变形及非线性渐进破坏特征、巷道周边关键部位的位移和应力变化进行了分析,研究了圆形巷道围岩松动圈的形成机理.研究表明:巷道开挖后,其周边形成应力集中带,随着围岩压力的持续作用,巷道周边产生塑性变形区,并沿径向形成裂纹;随着裂纹的不断扩展,巷道周边出现松动破裂区,即松动圈.产生破裂区后,应力集中程度减弱,应力高峰点向远处转移.
To study the failure laws of surrounding rocks for the roadway in deep rock mass, in view of the heterogeneity of rock, we use a constitutive model based on damage mechanics and statistical theory and the RFPA^2D, to analyze the deformation and nonlinear gradual failure characteristics of circular roadway in deep rock mass as well as the displacement and the stress variations in the key positions in the periphery of the roadway, and also the mechanism of loose rock zone in the surrounding rock of the circular roadway. The study indicates that the stress concentration occurs in the periphery of the roadway after evacuation and plastic deformation zone is engendered under the persisting stress of the surrounding rock, then the cracks appears and extends continuously, the loose fraction zone （loose rock zone） appears at last and the intensity of the stress concentration decreases as well as the stress field shifts beyond.
出处
《力学与实践》
CSCD
北大核心
2008年第6期64-67,共4页
Mechanics in Engineering
关键词
深部岩体
圆形巷道
围岩松动圈
数值模拟
deep rock mass, circular roadway, loose rock zone, numerical simulation
