基于有限元强度折减法对某边坡支护的优化探讨

Discussion on Optimized Supporting Design for a Slope Using FEM Strength Reduction Method

目前有限元强度折减法已经在边坡稳定性分析中得到了广泛的应用,但是锚索支护后边坡安全系数的还没有有效的定量计算方法,应用有限元强度折减法进行边坡支护设计的工作还未全面展开。通过折减土体及衬砌材料强度对某边坡的开挖前后及支护后的稳定性进行了评价,得到了各种情况下的破坏模式和安全系数。提出了一种计算边坡合理支护参数的新方法:将所有材料强度折减至规范规定的安全系数,再不断地减弱支护参数,使边坡达到濒临破坏的极限状态,此时的支护参数是能满足规范要求的最优的支护参数。本文的研究方法对类似边坡工程的设计具有一定的参考意义。

At present,FEM strength reduction method is widely used in stability analysis of slopes.However,there is still no effective way to calculate the safety factors of cable supporting slopes,and the FEM strength reduction method is still not applied to determining optimal support parameter extensively.The stability of the slope before and after excavating and after supporting is evaluated by reducing both soil and supporting structure strength indexes.In addition,failure modes and safety factors have been got as well.A new method on calculating the reasonable support parameters has been proposed that the strength parameter of all materials should be reduced to the safety factor that code stipulates,then to decrease the support parameter until the slope state is close to destroy,and the corresponding support parameter is an optimized design one that meets the requirement of the code.The research method shown in the paper can serve as reference for similar slopes.