摘要
原岩应力是影响巷道围岩稳定的决定因素,通过选择合理的巷道布置方式,改善巷道横断面应力分布状态,是解决巷道围岩变形破裂问题的关键所在.采用理论分析方法得到了表征巷道断面应力分布的应力椭圆表达式,并利用FLAC 3D数值模拟软件,分析了不同巷道布置情况下,围岩变形破裂特征与应力椭圆的关系.研究结果表明:巷道断面应力椭圆大小和分布随其走向不同存在显著差异,应力椭圆越大,巷道开挖后应力集中越明显;随着巷道断面主应力和的增大,巷道围岩变形和破坏范围也随之增大,且破坏主要发生在垂直最大主应力方向上,因此,最优的巷道布置方式应使应力椭圆最小.在平顶山十二矿井下进行原岩应力、巷道变形和松动圈实测,验证了理论分析和数值模拟结果.
The in-situ stress is the most important factor affecting the stability of the surrounding rock of roadway.It is the key to solve the problem of deformation and rupture of the surrounding rock by selecting a reasonable roadway layout to improve the stress distribution of roadway section.Expression of stress ellipse is derived by theoretical analysis,which can characterize the stress distribution of the roadway section.The effect of stress ellipse on roadway deformation and failure feature is studied by numerical simulation experiment.Results show that there are differences in the size and shape of stress ellipse under different layout of roadway.The bigger the stress ellipse is,the larger the displacement and the failure region of roadway is,and the mainly failure region is perpendicular to the direction of maximum principal stress.Therefore,the optimal roadway layout should minimize the stress ellipse.The results of theoretical and numerical simulation are verified by field tests in Pingdingshan No.12 Mine.
作者
潘兵
靖洪文
褚卫江
Pan Bing;Jing Hongwen;Chu Weijiang(Power China Huadong Engineering Corporation Ltd.,Hangzhou 311122,China;HydroChina ITASCA Research and Development Center,Hangzhou 311122,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《矿业工程研究》
2020年第1期41-46,共6页
Mineral Engineering Research
关键词
原岩应力
应力椭圆
巷道布置
变形破裂特征
数值模拟
in-situ stress
stress ellipse
layout of roadway
deformation and failure feature
numerical simulation
