关键词: 物理模型试验, 倾斜加载, 局部应力场变化, 水库型滑坡

Abstract: Usually a physical model can be built to simulate the failure process of slope and study the instability mechanism of slope, while inclined model is a typical loading method to simulate the failure process. As a loading method, the controllability of loading mode and similarity of stress field during inclining process are significant points that can influence the application of the method. In order to study the controllability of test, taking bulk slip mass for example, the influences of inclined model and centrifugal loading methods on anti-sliding safety factor of slip mass are analyzed. The results show that anti-sliding safety factor decreases persistently with the inclination angle increasing in the inclined loading mode. But the anti-sliding safety factors of centrifugal loading test are influenced obviously when the acceleration is in the range of 1g-10g(where g is acceleration of gravity). In order to compare the similarities of stress field in the model before and after inclining, a numerical model of physical slope is built to simulate stress fields with different inclination angles. The results show that the stress state in the middle of slope keep steady; the stress state in the front part of slope changes greatly when the inclination angle is larger; variation of local stress field is propitious to simulate the failure process of reservoir landslide. In order to verify the application effect of the inclined model to landslide failure process, a slope model test is taken based on the prototype of Qianjiangping landslide; the failure process of landslide is obtained. Comparing with the results simulated by discontinuous deformation analysis (DDA) method, the failure form obtained from inclined model test is closer to the real condition of landslide.

Key words: physical model test, inclined loading, local stress field changes, reservoir landslide