基于有限元强度折减法分析主应力方向对隧道稳定性的影响  

Influence of Principal Stress Orientation on Tunnel Stability Based on the Finite-Element Strength Reduction Method

作　　者：周磊 朱哲明 李元鑫 

机构地区：[1]四川大学建筑与环境学院,能源工程安全与灾害力学教育部重点实验室,成都610065

出　　处：《现代隧道技术》2017年第2期61-67,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金项目(11672194);四川省科技计划项目(2014JY0002);油气藏地质及开发工程国家重点实验室资助项目(PLN1505)

摘　　要：以有限元强度折减法为基础,文章采用物理模型试验和数值模拟相结合的方法研究了主应力方向对砂岩隧道稳定性的影响规律;数值模拟采用ABAQUS软件计算了直墙拱形隧道在不同主应力方向下的稳定系数和积分点上的塑性应变,计算结果与模型试验结果吻合较好。研究结果表明:有限元强度折减法能够很好地应用于隧道的稳定性分析;主应力方向对隧道的稳定性具有很大的影响;如果仅考虑主应力方向这单一因素对隧道整体稳定性的影响,当主应力方向与隧道断面夹角为45°时,隧道模型的整体抗压强度最低,稳定系数Fs最小,此时隧道稳定性最差。Based on the finite-element strength reduction technique, the effects of principal stress orientation on tunnel stability were studied by experimental and numerical methods. In the numerical simulation, ABAQUS code was adopted to calculate the safety factor and the equivalent plastic strain on the integral point of the arched tunnel with a vertical wall under different orientations of principal stresses, and the results agree well with the experimental results. The study results show that the finite-element strength reduction method can be well applied to the analysis of tunnel stability; the orientations of principal stresses affect tunnel stability significantly; if only the factor of principal stress orientation is considered, when the angle between the major principal stress and tunnel vertical axis is 45°, the tunnel model＇s compressive strength is the lowest, the safety factor is the smallest, and the corresponding tunnel stability is the worst.

关 键 词：强度折减法 主应力方向 围岩稳定性 ABAQUS 

分 类 号：U541.2[交通运输工程]