【摘要】 金坪子滑坡Ⅱ区为一巨型蠕滑滑坡,为了研究该滑坡在诱发因素影响下的强度变化规律,以滑坡Ⅱ区滑带土为研究对象,通过不同剪切速率、不同含水率和正应力下的环剪试验,研究了其强度特性,结果表明:滑带土应变软化现象明显,已达到稳定残余状态的滑带土随着剪切速率的改变其抗剪强度出现增大的现象,并且正应力越大,强度恢复的幅度越大,其原因可能是剪切速率的改变使其剪切模式发生了变化;峰值强度参数中黏聚力、内摩擦角均随含水率的增大而线性减小,但黏聚力的变化幅度比内摩擦角的大,残余黏聚力与含水率成负相关关系,残余内摩擦角变化很小。更多还原

【Abstract】 The Jinpingzi landslide is an old landslide to the arch dam of Wudongde Hydropower Station in the downstream direction on the right bank of Jinsha River. The displacement monitoring data shows that the landslide zone II presents an overall creep slip with a non-constant rate. In order to study the rule of strength change of landslide slip zone, its active zone Ⅱwas studied. A series of ring shear tests under different shear rates, moisture content and normal pressure was employed. Its strength characteristics were studied. It could provide reference for the protection and management of similar landslides. It is found that the phenomenon of sliding soil strain softening is obvious. The strength of the sliding zone increases with the change of shear rate and the greater the positive stress, the greater the magnitude of strength recovery. The reason may be that the shear rate changes its shear mode. The cohesion and internal friction angle of the peak strength parameters decrease linearly with the increase of moisture content and the change range of cohesion is greater than the internal friction angle. Residual cohesion is negatively correlated with moisture content and the residual internal friction angle has little change.更多还原