无衬砌浅埋隧洞松散压力的数值分析法  

Numerical Analysis of Surrounding Rock Pressure on Shallow Buried Tunnel

作　　者：向钰周[1] 王成[2] 郑颖人[3] 吴胜番[2] 

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆交通大学土木建筑学院,重庆400074 [3]后勤工程学院重庆市地质灾害研究中心,重庆400041

出　　处：《重庆交通大学学报（自然科学版）》2012年第3期380-384,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家"973"重点基础研究发展规划基金项目(2010CB732106);重庆市自然科学基金项目(2009BC0002)

摘　　要：将极限平衡理论和弹塑性理论相结合,利用ANSYS和FLAC3D数值分析软件来计算浅埋隧道松散压力。计算时先将土体强度参数进行折减,隧道开挖后不做衬砌,在拱顶施加与重力方向相反的节点力,通过调整施加的反力大小使隧道处于破坏极限状态,即极限平衡状态;通过软件是否收敛来判断隧道是否破坏。该方法考虑了土体材料的特殊性,有严格的力学依据,计算结果与实际情况更加接近,为求解浅埋隧道松散压力提供了一种新的方法。Based on the limiting equilibrium theory and elastic-plastic theory,surrounding rock pressure on shallow buried tunnel was calculated by the numerical analysis software ANSYS and FLAC3D.The soil strength parameters should be reduced before calculation,then nodal force was applied in the opposite direction of the gravity on the vault after excavation of tunnel with no-lining;then the nodal force was adjusted to get the limit state of the tunnel destruction,that was,the limit equilibrium.In the calculation,the convergence reflected whether the tunnel was destroyed.The method not only takes into account the speciality of soil material,but also has strict mechanics basis.The calculating result is more coincident with the reality,and this method offers a new way to calculate the surrounding rock pressure on shallow buried tunnel.

关 键 词：极限平衡理论 弹塑性理论 折减 数值分析 松散压力 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]