基于统一强度理论的巷道围岩抗力系数研究  

Investigation of rock resistant coefficient in rocks around tunnel based on unified strength theory

作　　者：马青[1] 赵均海[1] 魏雪英[1] 

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《岩土力学》2009年第11期3393-3398,共6页Rock and Soil Mechanics

基　　金：教育部博士点基金资助项目(No.20040710001);陕西省自然科学基金项目(No.SJ08E204)

摘　　要：在岩土工程中,岩石抗力系数K反映了岩石抗力的大小,是设计环节中需要确定的一个极为重要的基础计算参数。基于统一强度理论,将巷道围岩视为多孔介质,考虑地下水渗流作用的影响,推导出了巷道围岩抗力系数计算统一公式,改变公式中的参数可以退化为其他围岩条件或者其他强度理论条件下的围岩抗力系数计算公式。研究结果表明,反映中间主应力对材料屈服影响的参数b、材料的黏聚力c、内摩擦角φ、孔隙水压力、地应力、衬砌压力均对围岩抗力系数K有一定影响。The rock resistant coefficient K is an important parameter and it reflects the resistance of the rock around the tunnel in the geotechnical engineering. A formula of rock resistant coefficient is derived based on unified strength theory, which can be adopted to obtain rock resistant coefficient in other situations or strength thoeries simplified by assuming the parameter value in the formula. The strength differential effect, intermediate principal stress effect and the ground water permeation effect are considered in the formula. The results indicate that the coefficient b, cohesion C ,friction angle φ, the pore water pressure ,the in-situ stress and the lining pressure all have significant influences on the rock resistant coefficient K.

关 键 词：岩土工程 统一强度理论 围岩抗力系数 渗透作用 中间主应力效应 

分 类 号：TU43[建筑科学—岩土工程]