非等压圆形巷道围岩塑性分析  

Plastic Analysis of Surrounding Rock of Non-isobaric Circular Roadway

作　　者：尚阳光 杨自友 高鹏 张煜 SHANG Yangguang;YANG Ziyou;GAO Peng;ZHANG Yu(School of Civil Engineering,Anhui Jianzhu University,Hefei 230601,China)

机构地区：[1]安徽建筑大学土木工程学院,合肥230601

出　　处：《四川轻化工大学学报（自然科学版）》2023年第6期81-88,共8页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：安徽省高等学校自然科学研究重点项目(KJ2021A0610)。

摘　　要：为了精确分析巷道的塑性区变化规律,结合三剪应力统一强度理论,推导出了非等压圆形巷道的边界方程、围岩应力和塑性区半径解析解;结合工程案例,分析了侧压力系数、主剪应力参数对围岩弹塑性交界面应力和塑性区范围的影响。结果表明:侧压力系数大于1.0时,巷道顶、底板塑性区范围大于两帮,围岩应力随着方位角的增大而增大;侧压力系数小于1.0时,巷道两帮塑性区范围大于顶、底板,且围岩应力随着方位角的增大而减小。同时随着中间主剪应力系数和最小主剪应力系数的增大,围岩塑性区范围和径向应力减小,围岩环向应力增大。三剪应力统一强度理论在巷道塑性区计算过程中,可以同时考虑3种主剪应力对岩体的影响,在工程实践中具有一定的适用性和灵活性。In order to accurately analyze the change rules of the plastic area of the roadway,the analysis of the boundary equation,combined with the three shear stress unified strength theory,the boundary equations of the non-isobaric circular roadway,the surrounding rock stresses and the analytical solution of the radius of the plastic area are derived;and combined with the engineering cases,the influence of the lateral pressure coefficient and the main shear stress parameters on the surrounding elastic-plastic interfacial stresses and the range of the plastic area are analyzed.The results show that when the lateral pressure coefficient is greater than 1.0,the plastic area range of the roadway top and bottom plate is greater than two-sides and the surrounding rock stress increases with the increase of azimuth;when the lateral pressure coefficient is less than 1.0,the plastic area range of the roadway two-sides is greater than the top and bottom plate,and the surrounding rock stress decreases with the increase of azimuth.At the same time,with the increase of the intermediate main shear stress coefficient and the minimum main shear stress coefficient,the plastic area range of the surrounding rock and radial stress decrease,and the circumferential stress of the surrounding rock increases.The three shear stress unified strength theory in the process of calculation the plastic area range of the roadway,the influence of the three main shear stresses on the rock mass can be considered at the same time,which has certain applicability and flexibility in the engineering practice.

关 键 词：非等压圆形巷道 边界方程 塑性区半径 围岩应力 三剪应力统一强度理论 

分 类 号：TD322[矿业工程—矿井建设]