STABILITY OF LANDSLIDE ON THREE-GORGES DAM RESERVIOR WITH PHYSICAL SIMULATI ON MODEL

After construction of the Three-Gorges Dam, many geo-hazards happened on its Reservoir, The landslides are an outstanding issue. In order to take precautions against natural calamities effectively, adoption of the right technique methods to discuss the stability of landslides is essentially. This paper uses the setting of No.1 landslide at Tangjiaocun village as an example. A full prototype model is constructed in laboratory on the basis of the geology, groups of water and soil testing. Thus, in line with the similarity theory and the optimized similar materials for the landslide, the geological environment simulation test device is used to form a two dimensional geological mechanics model in laboratory. The polyethylene films and geomembrane are used to simulate the landslide soil. Rain and surface water can make the groundwater level change of landslide, to cause the shear strength reduction of landslide soil. So, they can change its stability. Two realistic simulation operations are designed. The model test uses inductance frequency modulation response device, ng notes machine without papers, and monitors the change of displacement and pore-water pressure and soil pressure of this landslide model continuously. The test results show that after rainfall(intensity is 220mmd-1,lasting 3d),while reservoir water level drops to 169m, the instability of landslide is at the leading edge. The deformation stages of the landslide curve of displacement with time can be divided to account the toe part of this landslide transferring from the static deformation stage into the accelerating creep stage directly.