节理岩体巷道围岩稳定性的颗粒离散元分析

doi:10.16265/j.cnki.issn1003-3033.2017.04.024

摘要/Abstract

摘要： 节理岩体具有不连续和大变形等特征。为研究节理岩体巷道围岩的稳定性,基于离散单元法的颗粒流程序,为设于节理岩体中(考虑其节理连通率为0,50%和70%的3种情况)的巷道建立模型,分析巷道围岩的变形以及微裂纹分布。结果表明,当巷道处于完整岩体时,巷道围岩变形较小;当围岩节理连通率达到50%时,巷道围岩出现局部脱落但没有明显的破坏面;当围岩节理连通率为70%时,巷道围岩容易形成破坏面,围岩出现块体状脱落,巷道围岩变形破坏严重。随着节理连通率的增加,围岩微裂纹急剧增加,围岩四周主要分布剪切裂纹,岩体巷道的破坏方式以剪切破坏为主。

关键词: 节理岩体, 颗粒流程序, 巷道, 节理连通率, 变形破坏

Abstract: Joint rock mass has discontinuity and large deformation characteristics.For the sake of studing the stability of a given roadway surrounding joint rock mass,a model was built for the roadway in a joint rock mass by using the particle discrete element method.The effect of connection rate of joint on deformation and failure of the rock mass was studied. The displacement of surrounding rock as well as the distribution of micro cracks were analyzed. The results show that the deformation of the rock mass under an external load is a function of the connection rate of joints,so when the rate is zero the deformation is small, when the rate reaches 50% local falling occurs, when the rate is 70%,rock of roadway tends to form failure surfaces, gives birth to blocks falling,and deforms seriously, and that with the increase of joint connectivity rate, surrounding rock micro cracks increase sharply, main cracks in surrounding rock are shear cracks,the most possible way of failure for the joint rock of roadway is shear failure.

Key words: joint rock mass, particle flow code, roadway, connection rate of joints, deformation and failures

中图分类号:

X936

李传明, 刘万荣. 节理岩体巷道围岩稳定性的颗粒离散元分析[J]. 中国安全科学学报, 2017, 27(4): 133-138.

LI Chuanming, LIU Wanrong. Particle discrete element method based analysis of stability of roadway surrounding joint rock mass[J]. China Safety Science Journal, 2017, 27(4): 133-138.

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