基于双折减系数法的多滑面边坡稳定性分析方法研究

目前针对大型多滑面边坡的稳定性分析研究，运用较多的依然是传统强度折减法。传统强度折减法，即同步折减法，是对整个边坡岩土体的c、值进行同步折减，并没有考虑c、值在边坡失稳过程中抗剪切作用的差异性。本文运用FLAC3D的SSR自编程序，选取同一组安全系数上、下限值，对c、值进行单独折减，直到边坡发生破坏，可算得c、值的折减系数，计算结果显示两者的折减系数是不同的，证明c、值在边坡失稳破坏过程中的抗剪切作用存在差异性。由此，基于传统强度折减法和c、值抗剪切作用的差异性提出一种新的双折减系数法先同后异强度折减法。尝试将此方法应用到多滑面边坡稳定性分析，以同步折减法作为参照，对比分析两种方法的计算结果。经对比发现：同步折减法算得的水平位移偏大，偏不安全。而先同后异折减法所得结果与实际监测数据吻合较好。

STUDY ON THE STABILITY ANALYSIS OF MULTI-SLIP SIDE SLOPE BASED ON DOUBLE REDUCTION METHOD

At present, the traditional strength reduction method is still widely used in the stability analysis of large multi-slip slope. The traditional strength reduction method, known as synchronous reduction method, is to synchronously reduce the values of c and Pauline of the whole slope rock and soil mass, without considering the difference in anti-shear effect of c and Pauline values in the process of slope instability. In this paper, the numerical simulation software FLAC3D is used to simulate the slope instability. And then the SSR is programmed to calculate the reduction coefficient of c and ,selecting the same set of safety coefficients and the lower limit value, and making a separate reduction. The reduction coefficient of c and is different, which proves that the attenuation of c and is different in the process of slope failure. Based on this, a new double-fold subtraction method is proposed, which is called the synchrotron and post-asynchronous subtraction. The method is used to analyze multi-sliding surfaces slopes and the simultaneous reduction method is used as the reference for calculating method. The comparisons show that the result of synchronization reduction is larger, and more conservative than synchronous and asynchronous reduction. Numerical simulation results of synchronous and asynchronous reduction are in good agreement with the actual monitoring data.