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深部岩体圆形巷道围岩松动圈形成机理数值试验研究
引用本文:于永江,张哲,王来贵,王大国.深部岩体圆形巷道围岩松动圈形成机理数值试验研究[J].力学与实践,2008,30(6):64-67.
作者姓名:于永江  张哲  王来贵  王大国
作者单位:辽宁工程技术大学学报编辑部
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$^{\rm 2D}$, 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.

关 键 词:深部岩体  圆形巷道  松动圈  破坏  数值模拟  
收稿时间:2007-6-26
修稿时间:2008-5-5

NUMERICAL SIMULATION OF MECHANISM OF CIRCULAR ROADWAY LOOSE ROCK ZONE IN DEEP ROCK MASS
YU Yongjiang , ZHANG Zhe , WANG Laigui , WANG Daguo.NUMERICAL SIMULATION OF MECHANISM OF CIRCULAR ROADWAY LOOSE ROCK ZONE IN DEEP ROCK MASS[J].Mechanics and Engineering,2008,30(6):64-67.
Authors:YU Yongjiang  ZHANG Zhe  WANG Laigui  WANG Daguo
Institution:YU Yongjiang~
Abstract: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.
Keywords:deep rock mass  circular roadway  loose rock zone  numerical simulation
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