基于局部强度折减法的多层级滑坡稳定性分析

Stability analysis of complex soil slope with several shear outlets based on limit equilibrium method

为了实现对多层级非均质复杂型边坡稳定性的全面研究和评判,提出了一种主动岩层组合式局部强度折减法.利用有限元软件,对三层边坡进行局部强度折减和全局折减分析,分析结果表明,全局折减往往减小了稳定性系数,而某些非主动岩层其抗剪强度参数变化很小,不能应用于强度折减分析计算中.通过采用局部强度折减法,依次对主动岩层进行组合分析计算,分析结果表明,对上覆残积坡层开挖卸荷后,对砂泥岩夹黏土层与强风化玄武岩之间的接触带利用端锚加固处理分析,加固后坡体稳定性明显提高,支护作用明显.该方法对于对于多层级复杂型边坡的稳定性分析是有效的,对于实际工程可灵活运用.

In order to realize the comprehensive research and evaluation for the stability of multilayer heterogeneous com-plex slope, a new method of active rock composite local strength reduction is proposed. The three - layer slope are analyzedby local strength reduction and global reduction. The results show that stability coefficient is reduced by global reductionmethod. Because of the variation of non - active rock shear strength parament is small. It can not be used in global strengthreduction analysis. The active rock composite are analyzed by local strength reduction method. The results show that afterthe unloading of the overlying residual slope. The contact zone between the clay mudstone and the weathered basalt are trea-ted by the end anchor. The stability of slope is heightened obviously. The effect of support is obvious. The method is effec-tive for the stability for the stability analysis of the muff - layer complex slope. It can he flexible used in practice.