Research On The Menchanism Of Reservoir Landslides And The Effect Of Water In The Imporment Hydropower Engineering Regions

In the reservoir areas, one of the emphases of geological disasters control is landslides. Comparing to ordinary landslides, the outstanding feature of reservoir landslides is greatly effected by water. So in the region of hydropower engineering, how to research the mechanism of reservoir landslides got water effect, that is difficult problem needing to solve imminently. Based on comprehensive collection and analysis about the research status and achievements at home and abroad, this thesis studied the mechanism of reservoir landslides effected by water. Applying the theories and methods of investigation, experiment analysis, numerical simulation, theoretical knowledge and so on, the typical reservoir landslides were studied in the regions of large-scale hydropower engineering. The main research results include:(1) This article summarized the types and characteristics of reservoir landslides, according to the effect of rainfall, reservoir water and ground water. First consult plentiful documents, then put to use the theoretical knowledge of geological engineering, landslides, rock mass mechanics and ground water dynamics and so on. The characteristics of slope structure and the main models of deformation failure were in-depth analysis, combining water effect. Advance 9 kinds of slope structures and 17 kinds of models of deformation failure on reservoir landslides.(2) As the effect of water in various degree might be, reservoir landslides was divided into four types:rainfall driven, reservoir water driven, ground water driven and mulriple driven, in the formative period of landslides.(3) Currently, when the reservoir level was changing, the ground water seepage should be the linear unsteady flow in the slope. This thesis put forward the analytic solution of ground water phreatic line, applying the second linearization method of Boussinesq equation. Then Dupuit eauqtion and Boussinesq equation were deduced, when the confining underlying bed was gradient. But if the variation range of reservoir level was big and fast, or the slope was porous, the hydraulic gradient would be larger in the reservoir slope. The Reynolds number might be larger than 3～10, during the ground water seepage. This seepage should be non-linear flow, and did not follow the Darcy's Law. When the reservoir level got down, this article advanced the analytic solution of ground water phreatic line using traveling wave method, according to Forchheimer equation.(4) Making use of ground water table monitor data in the reservoir slope, establish the nonlinear combined prediction mode of ground water table, based on time series method and speed analysis method.(5) Applying the theories and methods of geomechanics analysis, landslide monitor, experiment analysis, numerical simulation and so on, the mechanism, main driven factor of water, deformation characteristics and the development trend of different kinds of reservoir landslides were studied.Clarily the determination and methods of main driven factor of water, during the formation period of reservoir landslides.