非静水压力条件下巷道围岩偏应力场分布特征与围岩破坏规律  

Distribution characteristics of deviatoric stress field and failure law of roadway surrounding rock under non-hydrostatic pressure

作　　者：赵洪宝[1,2] 程辉 王磊[2] 刘一洪[1] 吉东亮 张一潇 ZHAO Hongbao;CHENG Hui;WANG Lei;LIU Yihong;JI Dongliang;ZHANG Yixiao(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001

出　　处：《煤炭学报》2021年第2期370-381,共12页Journal of China Coal Society

基　　金：越崎杰出学者计划资助项目(800015Z1179);深部煤矿采动响应与灾害防控国家重点实验室开放基金资助项目(SKLMRDPC19KF01);中央高校基本科研业务费研究生科研创新能力提升资助项目(2020YJSNY07)。

摘　　要：通过理论分析对受三向应力非静水压力条件下的巷道围岩偏应力场与应变能密度分布规律进行了深入研究,以此来探究巷道围岩破坏规律,巷道塑性区数值模拟结果与现场工程实例验证了理论结果的正确性。研究结果表明:①非静水压力条件下,不同的主导型应力场中,巷道围岩偏应力场分布规律差异较为明显。σ_(x)主导型应力场中,巷道顶底板偏应力大于两帮;σ_(y)主导型应力场中,巷道顶底板与两帮偏应力大小差别不大;σ_(z)主导型应力场中,巷道两帮处的偏应力大于顶底板。主导应力值的变化会引起巷道围岩偏应力分布数值上的变化,不引起偏应力分布形态的改变。②等p、等q时,在σ_(x)与σ_(y)主导型应力场中,巷道顶底板应变能密度大于两帮,而在σ_(z)主导型应力场中,巷道两帮应变能密度大于顶底板。等p、不等q情况下,3种主导型应力场中,巷道顶底板与两帮应变能密度均随偏应力比M的增大而增大;等q、不等p情况下,巷道顶底板与两帮应变能密度均随偏应力比M的减小而增大。③三向应力状态下,巷道围岩应变能密度分布规律可以反映塑性区形态。M<1时,任意主导型应力场中,巷道围岩应变能密度呈椭圆形分布,M>1时,巷道围岩应变能密度呈“8”字形或“X”形分布。处于σ_(x)主导型应力场中的巷道需注重巷道顶底板的支护;对于σ_(y)主导型应力场,巷道在围岩条件较差时,应注重全断面支护;对于σ_(z)主导型应力场,需注意围岩塑性区出现“X”形扩展。④回坡底1021巷围岩偏应力场与应变能密度均呈倾斜的“8”字形分布,工程现场与巷道围岩偏应力场及应变能密度分布规律相互验证。基于理论分析结果,对回坡底1021巷提出非对称性支护技术,现场应用效果良好。The distribution law of deviatoric stress field and strain energy density of roadway surrounding rock under the condition of three-dimensional stress and non-hydrostatic pressure is studied by theoretical analysis,so as to explore the failure law of roadway surrounding rock.The correctness of theoretical results is verified by numerical simulation results of roadway plastic zone and field engineering examples.The results show that①under the condition of non-hydrostatic pressure,the distribution law of deviatoric stress field of roadway surrounding rock is obviously different in different dominant stress fields.In theσ_(x) dominant stress field,the deviatoric stress of roadway roof and floor is greater than that of sidewalls.In theσy dominant stress field,the difference of deviatoric stress between the roof and floor of roadway surrounding rock and that of sidewalls is not significant.In theσ_(z) dominant stress field,the deviatoric stress of sidewalls of roadway is greater than that of roof and floor.The change of the dominant stress value will cause the change of the deviatoric stress distribution value of the surrounding rock,but will not cause the change of the distribution form of the deviatoric stress.②Under the condition of equal p and q,in theσ_(x) andσy dominant stress field,the strain energy density of roadway roof and floor is greater than that of sidewalls.While in theσ_(z) dominant stress field,the strain energy density of sidewalls of roadway is greater than that of roof and floor.In the case of equal p and unequal q,the strain energy density of roof and floor and sidewalls of roadway increases as the increase of deviator stress ratio M in the three dominant stress fields.In the case of equal q and unequal p,the strain energy density of roadway roof,floor and sidewalls increases as the decrease of deviatoric stress ratio M.③Under the state of three-dimensional stress,the distribution law of strain energy density of surrounding rock can reflect the shape of plastic zone.When M<1,in arbitra

关 键 词：非静水压力 偏应力场 应变能密度 塑性区分布 巷道支护 

分 类 号：TD322[矿业工程—矿井建设]