基于有限元强度折减理论的边坡稳定分析方法探讨与改进

Discussion and Improvement for Slope Stability Analysis Method Based on Strength Reduction FEM

随着计算机技术的发展,强度折减法在边坡稳定分析中的应用越来越广泛。首先介绍其原理,推出DP1和DP3准则的转化公式;然后分析强度折减法的缺陷:c和φ在边坡发生滑动渐进过程中折减速度不同,强度折减法采用同一折减系数不能反映各自的实际安全储备。由此提出双折减法,对c、φ采用不同折减系数,分析边坡坡比及坡高变化对双折减系数的影响,同极限平衡法、强度折减法进行对比,得出一个更加可靠、合理的边坡稳定性分析评价体系。

With the development of computer technology,the strength reduction method has a wide application.Firstly,its principle is introduced,and the conversion formula between DP1 and DP3 is derived.Secondly,its defects are indicated as follows： When the slope slides gradually,the c and φ have different reduction speed.If the same strength reduction factor is adopted,the actual safety reserve could not be reflected.So the c and φ ought to be reduced in different factors.This is called dual reduction method.The influence on the dual reduction factors of different slope ratios and slope heights is analyzed in detail.Furthermore,the dual reduction method is compared with the limit equilibrium method and strength reduction FEM,so as to get a more reliable and reasonable analysis and evaluation system for slope stability.