| There are a large number of geological hazards lying on the valley of three gorges reservoir because of the complex geological conditions. They will threat the reservoir efficiency. And about60%slopes destabilized with water level lowering, according to Statistics. Therefore, the stability study on the landslides lies on the Yangzi river valley is very important to Three Gorges reservoir.Liangshuijing landslide is taken as an example in this paper. Firstly, characteristics of the landslide were studied, such as rocks and soils, deformation, effecting factors, mechanism etc. And then seeping and stability under different lowering speeds of the reservoir level was studied with intensity inducing method and unsaturation intensity theory. The main results ware list as follows:Geological environment was studied in this paper, including landform, geological tectonics, characteristics of soils and rocks, hydrographic conditions ect.Then characteristics such as boundary, scale, constitution of the landslide were clarified. And basing on the monitoring data and analyzing on influence factors, deforming mechanism was studied.Basing on the analyzing of Saturation line, pore pressure with SEEP/W, distribution regularity of seepage field in the landslide was studied. It indicated that when the reservoir level lowering from175m elevation to145m elevation, flowing pressure directed slope outward, and then effecting stress increasing.With reservoir level lowering, groundwater level in the landslide lowered also, but lagging with reservoir level. Flowing pressure distributes by front of the landslide. And there is the maximum hydraulic head in toe of the landslide. The simulation also indicated negative pressure generally appeared upper upon the saturation line, but the positive pressure under the saturation line.Basing on seeping analyzing, landslide stability under different lowering speeds of the reservoir level was studied with intensity inducing method and unsaturation intensity theory. |
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