深部巷道围岩热-固耦合条件下的变形破坏数值分析  

Numerical Analysis of Surrounding Rock Deformation and Failure in Deep Roadway under the Condition of Thermal-solid Coupling

作　　者：谭云亮[1,2] 张强[1,2] 

机构地区：[1]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590 [2]山东科技大学矿业与安全工程学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2016年第2期29-37,共9页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51274133;51474137;51474136);山东省自然科学基金重点项目(ZR2012EEZ002)

摘　　要：为研究深部巷道围岩热-固耦合条件下的变形破坏特征,根据深部巷道围岩体稳态温度场模型,得出了热-固耦合条件下深部巷道围岩体应力场、位移场及塑性圈半径的解析解,总结了热应力作用下围岩变形破坏的影响因素。借助Comsol Multiphysics多物理场耦合仿真软件对深部巷道围岩进行热-固耦合数值模拟,并将岩石力学参数与温度的关系引入模拟计算,分析了热应力、支护阻力对围岩变形破坏的影响规律。仿真结果显示,围岩热应力场分布呈非线性变化,浅部应力梯度大,深部应力梯度小;当巷内温度低于原岩温度时,热应力为压应力;随原岩温度升高,径向卸压范围及切向应力集中范围扩大,围岩塑性圈宽度和径向位移值有所增大;随巷内支护阻力提高,围岩塑性圈宽度和径向位移值则有所减小。现场试验发现,巷道围岩热应力场、应力场及位移场计算结果与实测结果吻合较好。To study the deformation and failure characteristics of surrounding rock in deep roadway under the condition of thermal-solid coupling,the analytical solution of stress field,displacement field and plastic circle radius in surrounding rock under the condition of thermal-solid coupling was obtained and the influencing factors of deformation and failure of surrounding rock under thermal stress was summarized based on the steady temperature field model of surrounding rock mass in deep roadway.With the multi-physical-field-coupling simulation software of Comsol Multiphysics,the thermal-solid coupling numerical simulation of surrounding rock in deep roadway was carried out and by introducing the relationship between rock mechanical parameters and temperature into the simulation calculation,the influence law of thermal stress and support resistance on deformation and failure of surrounding rock was analyzed.The results show that the thermal stress field distribution in surrounding rock is of nonlinear variation with large stress gradient in shallow surrounding rock but small stress gradient in deep surrounding rock.When the temperature in the roadway is lower than that of the original rock,the thermal stress is compressive stress and when the temperature of the original rock increases,the pressure relief range in the radial direction and the stress concentration range in the tangential direction expand,the width of plastic circle and radial displacement of surrounding rock is increased.When the support resistance in the roadway increases,the width of plastic ring and the radial displacement of surrounding rock decrease.The field test shows that the calculated results of roadway＇s thermal stress field,stress field and displacement field are in better agreement with the actual field measurements.

关 键 词：深部巷道 温度场 应力场 热-固耦合 围岩 稳定性 

分 类 号：TD315[矿业工程—矿井建设]