基于有限元强度折减法确定某隧道的安全系数

有限元强度折减法在确定边坡安全系数中得到了广泛应用，其基本原理为：同时折减土体材料强度参数c、φ值，找到边坡濒临破坏时的折减系数，此折减系数即为安全系数。对于隧道结构可采用类似的方法：折减土体的材料强度，将隧道濒临破坏时的折减系数定义为隧道的安全系数。通过有限元强度折减法计算得到算例隧道的安全系数。

Determination of Tunnel Safety Coefficient Based on Finite Element Strength Reduction Method

The finite element strength reduction method is extensively applied for determination of the safety coefficient of side slope. The fundamental principle of this method is： reducing the values of strength parameters and φ of soil materials simultaneously to find out the reduction coefficient, i.e. the safety coefficient of side slope, on the verge of damage. For tunnel structure the similar method can be used, in which the material strength of soil is reduced and then the reduction coefficient of the tunnel on the verge of damage is defined as the safety coefficient of tunnel. This paper obtains the safety coefficient of exampled tunnel by means of finite element strength reduction method.