类土质岸坡渗流稳定性的修正传递系数法——以三峡库区凉水井滑坡为例

Revised Transfer Coefficient Method of Seepage Stability for Quasi Soil Bank Slope:a Case Study of Liangshuijing Landslide in Three Gorges Reservoir Area

【目的】提出考虑渗流驱动力作用下的岸坡稳定的修正传递系数法。【方法】分析《重庆市地质灾害防治工程设计规范》(DB50 5029-2004)(后简称《规范》)中三峡库区岸坡渗流驱动力计算方法的不足,建立类土质岸坡渗流驱动物理模型,提出岸坡渗流驱动力精细化计算方法,考虑渗流驱动力修正了类土质岸坡稳定性计算的传递系数法。【结果】三峡库区凉水井滑坡实例分析表明,《规范》中的方法和本文方法得到的稳定系数分别为1.061和1.074,《规范》中的方法关于渗流驱动力计算过于保守。【结论】考虑渗流驱动力精细化计算方法对于大型、特大型岸坡稳定性计算具有实际工程意义。

[Purposes]It aims to propose the revised transfer coefficient method of bank slope acted by seepage force.[Methods]It analyzed the deficiency of seepage force calculation of the quasi soil bank slope in＂Standard＂,and established the physical model of soil,and proposed the fine seepage force calculation method of the quasi soil bank slope,then revised the transfer coefficient method for the quasi soil bank slope thinking of the seepage force.[Findings]The case of Liangshuijing landslide analysis showed that stability coefficients by the＂Standard method＂and this paper＇s method respectively were 1.061 and 1.074;calculation about the seepage force by the＂Standard method＂was conservative.[Conclusions]Considering the fine seepage force calculation method has the practical engineering significance to lager-scale and super lager-scale bank slope stability calculation.