| QingShi landslides located at ShenNv river’s right bank which is branch of the Yangtze river of ChongQing WuShan, is apart from the Yangtze river ZhuHangDao2.1km. The landslide occurred in October2009the Yangtze river three gorges reservoir175m water storage during commissioning, for the Yangtze river since the impoundment of the three gorges reservoir induced in a typical of landslide, with large scale and harm, the outstanding characteristic of deformation. A direct threat landslide area113homes in354people to the lives and property of the security, once the landslide down, may jam up prostitutes way, destroy state-level scenic natural landscape, the threat of navigation channels, upstream and downstream boating safety and flooded prostitutes in3km upstream of the peak power net altar, form the waves will influence the safety of the Yangtze estuary ZhuHangDao. The competent departments will be recognized as the orange QingShi landslide warning level, and prostitutes FengHang stream channel.This papers to the QingShi landslide for typical examples, the use of QingShi landslide exploration and professional monitoring data, and the basic characteristics of landslide, failure mode, stability, waves of prediction on the in-depth study of the system. Research in the landslide exploration work, and on the basis of the survey, taken of surveying and mapping drilling, groove, geophysical exploration and agent in situ test, indoor soil test technology means, make full use of exploration and professional monitoring data, the QingShi the basic characteristics of the landslide, failure mode, stability, waves of basic problems forecast is studied, the landslide failure mode analysis, the limit equilibrium method to the conditions of the landslide stability make system analysis and evaluation, the party.(1) QingShi landslide plane appears irregular shape vessel, the average width of about600m, ZongChang average about825m, the landslide main sliding30direction, average thickness of about80m, distribution area of495000m2, the volume of about40million m3, belong to large with deep drawing type of earthiness landslides. Landslide deformation area in front of the strong plane calms shape, the average width of about325m, ZongChang average about225m, strong deformation area26°sliding direction, average thickness50m, distribution area of73100m2, the volume is3.75million m3.(2) the deformation and failure of the old landslide slope deformation, through large-scale slipping, filling the front and rear edge depressions river erosion cutting three stages. The three gorges reservoir water after175m, due to higher water erosion caused rivers and ground water raise datum, the front of landslide geotechnical produce float "function, softening action, erosion, water levels in the sliding down the body produces infiltration pressure, lower landslide stability, lead to old landslide rise again. Landslide front constantly instability and failure, lead to the landslide sliding resistance is reduced, form traction type sliding failure.(3) exploration results and professional monitoring data shows, the landslide front deformation area after strong deformation, collapse, slipping, collapsed in the process of debris back pressure and stress have been released, is still in uniform deformation, rainfall weather front slump happens, strong deformation area in basic stability to owe stable state. Landslide currently deformation, whole smaller speed slow, in basic stable state.(4) in this paper, the QingShi landslide strong deformation area after damage can be generated high waves predicted, the library water level from175m down to145m under the condition of high initial waves biggest, different sliding mode possible initial ocean surges height11.76～18.19m, slippery body movement speed5.48～8.65m/s, waves occur from20.7to28.8m in to the10km place gradually attenuation of0.7～0.9m. |
PDF Full Text Request