考虑盾构掘进速度的隧道掘进面稳定性分析  

Face stability analysis of tunnel considering shield advance velocity

作　　者：高健[1] 张义同[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《岩土力学》2010年第7期2232-2237,2240,共7页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973计划)(No.2007CB714001)

摘　　要：隧道在低渗透性土壤中掘进,盾构掘进速度的改变将引起作用在掘进面上支护压力的显著变化。考虑盾构掘进速度以及土体的渗透系数的影响,通过伽辽金有限元法推导三维稳态渗流有限元方程,使用FORTRAN代码编制数值分析程序计算稳态地下水流条件下隧道掘进面附近水头分布。维持掘进面稳定极限支护压力由有效支护压力和渗透力共同构成,前者基于土体稳定的极限平衡理论计算结果,后者通过隧道掘进面附近水头分布推导得出。结果发现,低渗透性土层中进行隧道掘进,盾构掘进速度的改变对隧道掘进面附近水头分布产生很大影响,掘进速度的增加将引起作用在隧道掘进面上支护力的显著增加。理论分析结果与实验数据取得较好的一致,验证了该理论与方法的合理性和有效性。During shield-tunneling under soil with poorly permeable parameters, it has been observed that higher are the advance velocities, higher support pressure is needed to keep stability of the tunnel face. the governing equations for head distribution with shield advance velocity and permeable parameters involved are deduced by residual-Galerkin method; a finite element program with Fortran codes is developed and used to solve the governing equations numerically. The minimum support pressure to keep stability of tunnel face is equal to the sum of the seepage pressure acting on the face and the effective support pressure, which is obtained by using limit theorem and limit equilibrium analysis. It is found that the shield advance velocities have significantly effect on head distribution around tunnel face in poorly permeable ground; the increase of advance velocities leads to the obvious variation of the support pressure; and the analytical results are consistent with the measured data in engineering.

关 键 词：盾构掘进速度 掘进面稳定 极限平衡 渗透力 

分 类 号：U451.5[建筑科学—桥梁与隧道工程]