基于局部稳定场系数法的含水率变化诱发滑坡稳定性分析

为准确评价由降雨及泄洪雾化导致的岩土体含水率上升所诱发的滑坡的稳定性,引入局部稳定场系数法,并对其相关的基础理论及求解过程进行了说明。最后基于此法对具体实例开展了稳定性分析,并与基于滑动面假定的刚体极限平衡法所得结果进行了比较。结论如下:对同一滑坡开展稳定性分析,采用局部稳定场系数法所求结果与现场调查及传统的刚体极限平衡法所得结果吻合;结合Geostudio-Seep/W-Sigma/W、Excel VBA、Surfer等程序可实现局部稳定场系数法,该法无需指定滑动面,且充分考虑斜坡体应力环境,适于评价由降雨及泄洪雾化引起的斜坡失稳问题。

Local factor of stable field method-based stability analysis on water content change induced landslide

In order to accurately evaluate the stability of the landslide induce by rise of water content in soil-rock mass caused by rainfall and atomization from flood discharge，the local factor of stable field method is introduced herein，while its related basic theory and solving process are illustrated as well. Based on this method，the relevant stability analysis is finally made on a specific case，and then the result is compared with that from the sliding plane assumption-based rigid limit equilibrium method. It is concluded that for the stability analyses made on a same landslide body，the result got from the local factor of safety method is coincided with that from the conventional rigid limit equilibriun method. In combination with the programs such as Geostudio-Seep/W-Sigma/W，ExcelVBA，Surfe，etc.，the local factor of stable field method can be realized. No any sliding planes are necessary to be specified for this method，and that the stress enviroment of slope-body is fully considered by the method，thus it suitable for evaluating the instability of slope-body induced by rainfall and atomization from flood discharge.