广西右江沿岸粘土三轴渗流剪切强度试验研究

Experimental research on triaxial shear strength with seepage of saturated clay in the coastal region of Youjiang river in Guangxi

水位骤降是影响边坡失稳的重要因素之一。渗透性较差的粘性土质边坡在水位骤降时坡体内形成的渗流力要远大于渗透性较好的边坡坡内产生的渗流力,所以更容易发生边坡变形、失稳。文章通过室内三轴试验,研究广西右江沿岸饱和粘土渗流特性和渗流作用下的抗剪强度变化规律。根据试验结果,得出了在不同围压状态下,该地区饱和粘土比降—渗流速度、渗透压力—粘聚力、渗透压力—内摩擦角间的关系及变化规律,同时对其关系曲线进行了拟合,得到了相应的拟合函数。

Rapid drawdown is one of the key factors that lead to slope deformation and failure,and clay slope is easy deformed or unstable with rapid drawdown that usually has due to its poor permeability.In this paper,the investigations on the seepage character and the regularity for change of shear strength with seepage of saturated clay were carried out using the triaxial shear penetration tester in the conditions of three different confining pressures in the coastal region of Youjiang river in Guangxi.The relationship between gradient and seepage velocity,the relationship between seepage pressure and cohesion,as well as the relationship between seepage and friction angle were obtained.Then the fit curve and function were created.