类土质边坡工程特性及稳定性明显区别于一般的均质土边坡和岩质边坡,实际生产项目中,工程技术人员多将其视为一般的均质土边坡进行勘察、设计,造成了设计浪费或设计失败,因此对类土质边坡变形的地质力学模式及失稳机理的研究具有实用价值。以重庆市合川区狮滩镇洞堂湾边坡为地质原型,在对边坡赋存的地质环境条件、边坡的坡体结构特征、变形破裂特征分析的基础上,得出该类边坡变形的地质力学模型为渐进后退式蠕滑-拉裂;边坡失稳机理分析结果表明该边坡多发生在暴雨或持续降雨期间,有一定的滞后特征,边坡失稳多受坡体中倾外的缓倾结构面及陡倾的裂隙面控制。最后采用平面滑动法对该边坡进行稳定性分析和评价,计算结果与边坡的变形破裂特征基本相互吻合。

The engineering properties and stability of soil-like slope obviously differ from those of homogeneous soil slope and rock slope. In actual construction projects, soil-like slopes are regarded as general homogeneous soil slope and rock slope, resulting in inadequate reliability, or conservative support. Research on the geomechanical model and instability mechanism of soil-like slope is of practical significance. In this paper, Dongtangwan slope in Hechuan district of Chongqing is taken as a geological prototype to analyze the geological conditions, structural features, and deformation behaviors of the slope. Results reveal that the geomechanical model is progressive backwards creep slide-tension fracture; instability analysis shows that the failure of soil-like slope usually happens in storm or continuous rainfall, with some lag in time, and the instability is mainly controlled by the gently-inclined structural planes and steep-inclined fissure planes. Furthermore, the slope stability is analyzed and evaluated based on plane sliding mode. The calculation results are consistent with the deformation characteristics of the slope.