湘江阶地粉质粘土边坡失稳分析与治理

利用边坡监测结果和室内试验,对湘江阶地上的粉质粘土边坡失稳机理进行全面的研究。研究结果表明,土体开挖成坡后,边坡中出现了由应力重分布引起的应力集中和张应力带;而大量的水进入土体后,一方面降低了土的粘聚力和内摩擦角,并使土的粒间吸力丧失,另一方面增加了土的容重,产生了不利于边坡稳定的静水和动水压力。张应力和水的共同作用,是导致了边坡失稳的直接原因。

Instability Analysis and Control of a Silty Clay Slope

By use of the results of slope survey and indoor test of soil,the instability mechanism of a silty clay slope which locates on XiangJiang River bank terrace is studied.The study indicates that there is stress centralization area and tensile stress area in the slope due to the stress redistributing after the slope forming by excavation.Alarg amount of water seeping into the slope,on the one hand decreases the cohesion and friction angle of soil,and makes the suction between grains lose,on the other hand,increases the density of soil,and produces hydrostatic stress and dynamic stress which are harmful to the slope stability.The combined effect of the tensile stress and seeped water is the direct cause of dilapidation of this silty clay slope.