This paper focuses on exploring the sliding mechanism of expansive soil navigation slope.The study building on the navigation slope of Hongweiqiao to Xiaba navigation lock in Gaoli section of Wushen line as the engineering background involves numerically calculating the slope stability by using hydro-mechanical coupling theory and strength reduction method with the on-site observation data,explo-ring the causes of the slope instability,and proposing the corresponding engineering countermeasures.The results indicate that for the water-loss shrinkage of the surface expansive soil after water-absorption expan-sion,the decrease of the interface shear strength leads to shallow sliding of the slope,as which is not the main cause.The rainfall significantly reduces the safety factor of the slope to 1.089;the shear strength of the 3-2-1 clay layer softened by water in the slope decreases rapidly,and the formed weak structural plane as the dominant sliding surface can make the slope slide along the deep layer of the weak sliding surface only with the safety factor by 0.98.Based on the cause of slope instability,this sliding mode is consistent with the actual situation observed on site,and the micro-steel pipe pile will be employed to strengthen the slope in the subsequent construction.
维普
万方数据