强度折减法进行公路隧道边仰坡稳定性分析

隧道洞口段边仰坡的破坏经常是引起洞口坍塌、构筑物开裂破坏的主要原因,因此隧道洞口段边坡的稳定性是隧道设计和施工时必须认真对待的问题.针对隧道洞口处不同边仰坡形式,运用有限元强度折减法,通过对边仰坡非线性有限元模型进行强度折减,使边坡达到不稳定状态时有限元静力分析不再收敛,得到边坡的稳定性系数,同时得到边仰坡破坏的滑动面及破坏过程.通过数值模拟结果和实际工程结果的对比,证明有限元强度折减法在隧道边仰坡稳定性分析中有重要意义.

Application of Strength Reduction FEM in the Stability Analysis of Highway Tunnel Slope

The collapse of slope in the tunnel entrance section is frequently the main reason to cause the struc- tures fracture destroy or even collapse of the portal,so the stability of the tunnel access slope is a question that must be seriously considered in the time of design and operation of the tunnel.For different slope form of tunnel entrance, this paper uses the Strength Reduction Finite Element Method,and reduces the strength of the side slope's non-lin- ear finite element model,till the FEM program is no longer at the steady state,then we can get the slope stability co- efficient,the sliding line and the process of the destruction.Comparing the results of the Strength Reduction FEM with the particular project,the feasibility of the Strength Reduction FEM was confirmed in the stability analysis of a slope in a real tunnel project.