复杂渠坡稳定性分析方法比较

目前边坡稳定性分析方法主要有刚体极限平衡法、有限元极限平衡法以及有限元强度折减法3种.为了分析这3种方法以及不同屈服准则在边坡稳定计算中的差异性，以南水北调工程中某典型复杂渠坡为例进行比较计算.结果分析表明，3种计算方法所得渠坡稳定安全系数相近，其中强度折减法中不同的屈服准则对计算结果影响较大.鉴于M-C准则在应力空间中屈服面棱角会对数值计算稳定性产生影响，建议优先采用与M-C准则相匹配的D-P3或D-P4作为强度折减法的屈服准则，由此计算得到的边坡稳定安全系数合理，且参数折减时能保持计算过程具有良好的稳定性.

Comparison of different channel slope stability analysis methods

At present， three methods can be used in channel slope stability analysis， which are the rigid limit equilibrium method， the finite element limit equilibrium method and the finite element strength reduction method. In order to compare these three methods and different yield criteria in the slope stability analysis， the stability of a typical and complex channel slope in the South-to-North Water Transfer Project is calculated. The calculated results show that these three methods can get a similar safety factor， while the yield criterion is a great impact factor in a strength reduction method. As the edges and corners of Mohr-Coulomb(M-C) yield criterion can affect the stability of numerical calculation， the third or the forth Drucker-Prager(D-P) criterion which is used to match M-C criterion can take place of M-C criterion in the channel slope stability analysis. In this way， the safety factor would be reasonable and the calculation process would be stable in the finite element strength reduction method.