基于Mohr-Coulomb准则的隧道围岩工程边界估算  

Boundary Estimation of Tunnel Surrounding Rock Engineering Based on Mohr-Coulomb Criterion

作　　者：苏雅 苏永华[2] 杨仲轩[1] Su Ya;Su Yonghua;Yang Zhongxuan(Department of Civil Engineering,Zhejiang University,Hangzhou 310058,P.R.China;Department of Civil Engineering,Hunan University,Changsha 410082,P.R.China)

机构地区：[1]浙江大学土木工程学系,杭州310058 [2]湖南大学土木工程学院,长沙410082

出　　处：《地下空间与工程学报》2025年第1期52-60,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(52178330,52408449)。

摘　　要：在隧道数值模拟中,模型尺寸即代表隧道围岩工程边界范围,对隧道稳定性分析及设计具有重要意义。基于Mohr-Coulomb准则,以围岩应力扰动幅度为定量指标,提出了考虑围岩质量的隧道围岩工程边界估算方法。利用了4个不同质量等级隧道围岩案例进行验证对比。结果表明,估算方法可快速针对不同级别围岩的工程边界范围进行预估,其中Ⅲ和Ⅳ级围岩的估算结果与数值模拟结果非常接近。进一步分析侧压力系数和洞室几何形状对隧道围岩工程边界位置的影响。结果显示,侧压力系数的影响非常明显,而洞室几何形状的影响微乎其微。该方法可为保证地下隧道工程数值建模分析的准确度提供思路。In numerical modelling of tunnelling,the size of the numerical model,representing the range of engineering boundary for tunnel surrounding rock,is of great significance for tunnel stability analysis and design.Based on Mohr-Coulomb criterion,an estimation method was proposed for the engineering boundary range of tunnel surrounding rock considering rock mass quality,taking rock stress disturbance amplitude as a quantitative indicator.Rock masse of four quality levels were utilized to validate the estimation method.The results show that:The estimation method can be used to quickly predict the engineering boundary range for rock masses of different qualities,in which the estimation results for rock mass gradeⅢandⅣare highly closed to the numerical results.Furthermore,the impacts of lateral pressure coefficient and excavation shape on the engineering boundary range were investigated.The results indicate the lateral pressure coefficient has an obvious effect while the excavation shape has a negligible one.This proposed estimation method provides advice for the accuracy of the numerical modelling design and analysis in underground tunnels.

关 键 词：岩质隧道 隧道围岩 工程边界 MOHR-COULOMB准则 应力扰动幅度 

分 类 号：U451[建筑科学—桥梁与隧道工程]