基于统一强度理论的有压巷道覆盖岩层厚度计算  

Overlying Rock Thickness Calculation of Roadway with Pressure Based on Unified Strength Theory

作　　者：李天华[1] 魏雪英[1] 赵均海[1] 孔巍[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2010年第1期78-83,共6页Journal of Architecture and Civil Engineering

基　　金：教育部高等学校博士学科点专项科研基金项目(20040710001);陕西省自然科学基础研究计划项目(SJ08E204)

摘　　要：基于统一强度理论对有压巷道围岩应力进行了弹塑性分析,通过控制塑性区半径,推导出有压巷道覆盖岩层最小厚度的计算公式,当考虑不同中间主应力的影响时,用该公式可计算出一系列的覆盖岩层厚度;在实际工程中可以根据岩石性质试验确定中间主应力参数,得出合理的覆盖岩层最小厚度,从而合理地设计巷道。分析结果表明:该公式考虑了拉压强度差效应和中间主应力的影响,可以退化为其他围岩条件或其他强度理论条件下的覆盖岩层厚度的计算公式,具有较强的实用价值。The elasto-plastie analysis for the stress of surrounding rock of roadway with pressure was carried out based on unified strength theory. By controlling the radius of plastic zone, the formula of the minimum overlying rock thickness was deduced. The effect of the intermediate principal stress on the material strength and the effect of strength difference in tension and compression were considered in the obtained formula. A series of overlying rock thicknesses could he obtained by defining the coefficient of intermediate principal stress. In practical engineering, the proper coefficient of intermediate principal stress could be obtained according to the experiment results of rock, and the minimum overlying rock thickness could be reasonably determined, furthermore, the roadway could be designed reasonably. The analytical results show that the formula considers the strength difference in tension and compression and intermediate principal stress, and the formula can be degenerated into the formula under other surrounding rock conditions or other strength theories. It has a good practicality.

关 键 词：巷道围岩 覆盖岩层厚度 弹塑性分析 统一强度理论 中间主应力 

分 类 号：TU452[建筑科学—岩土工程]