考虑应变硬化和扩容特性的巷道围岩稳定性分析  

Stability analysis of surrounding rock of roadway considering both strain hardening and dilatancy feature

作　　者：朱传奇[1,2] 殷志强[1,2] 李传明[1,2] 刘万荣[1,2] 范浩[1,2] 

机构地区：[1]安徽理工大学深部煤矿采动响应与灾害防控安徽省重点实验室,安徽淮南232001 [2]安徽理工大学能源与安全学院,安徽淮南232001

出　　处：《中国安全科学学报》2016年第6期157-162,共6页China Safety Science Journal

基　　金：国家自然科学基金重点资助(U1361208);国家自然科学基金资助(51304007);安徽省自然科学基金资助(1408085MKL41)

摘　　要：为获得更为准确的巷道围岩应力分布和位移特征,在考虑围岩峰前应变硬化和扩容特性的基础上,由围岩平衡方程推导出围岩弹性区和塑性区应力表达式以及塑性区半径和位移的解析表达式,运用FLAC3D软件模拟巷道围岩应力分布,并通过算例分析围岩应变硬化、扩容特性、强度特征等因素对理论解的影响。研究结果表明:考虑应变硬化后,围岩径向应力呈光滑无尖峰分布,围岩应力分布特征与数值模拟结果一致;应变硬化和扩容对巷道围岩弹塑性解均有影响,围岩稳定性分析中,不可忽略这两者的作用;增大支护阻力、强化围岩有助于提高围岩稳定性。In order to obtain correct stress distribution and displacement feature of surrounding rock of roadway, considering the pre-peak strain hardening and dilatancy feature of surrounding rock, analytical expressions were deduced for stress in both elastic zone and plastic zone in surrounding rock, and radius of plastic zone based on equilibrium equation of surrounding rock. Stress distribution of surrounding rock was simulated by using FLAC3 D. Effects of strain hardening, dilatancy, strength of surrounding rock on the theoretical solution were also discussed through an example. Research results show that tangential stress distribution curve of surrounding rocks goes smoothly and without peakdistribution after considering the strain hardening, the stress distribution feature of surrounding rock is consistent with the results of numerical simulation; strain hardening and dilatancy have a greatinfluenceon the elastic-plastic solution of surrounding rocks, the effects of them can not be neglected when analyzing the stability of surrounding rock, and that increasing the support resistance and strengthening the surrounding rocks will be helpful to improve the stability of surrounding rock.

关 键 词：巷道围岩 损伤统计本构模型 应变硬化 扩容特性 稳定性分析 

分 类 号：X936[环境科学与工程—安全科学]