Study On The Numerical Simulation Of Slope Shape Transformation And The Optimized Prevention Of The Debris Landslides

Debris landslide, which includes all of the soil layer landslides, the accumulation landslides in mountainous district, and the loose accumulation landslides caused by constructing, unloading and weathering takes place in the Quaternary System and recent loose accumulation distributed. It has the characteristics of the broad distribution, the big scale, the strong burst and the serious destructiveness. Therefore, it will have a profound theoretical significance and vast economic profit to carry out the scientific prediction and control of this kind of landslides.Supported by the projects of National Natural Science Foundation of China-"Responding Ratio Parameter to loading & unloading and Displacement Dynamic Prediction of the Debris Landslides"(Code No: 40672182) and"Dynamic Parameter to Displacement vector angle and Displacement Integrated forecast in polyphyletic information of the Debris Landslides"(Code No: 40872184), and based on the fieldwork for the Three Gorges region and the system analysis on the basic feature and the displacement dynamic features of Longwangmiao landslide, the numerical simulation is carried on the Longwangmiao landslide by the famous geotechnical engineering analysis software Midas/GTS and FLAC3D. This article mainly the following circumstances :(1)This article is currently not colluvial landslide enough attention to the face of rock slope stability of the status quo, through the coordination of the slope and the relationship between the bedrock surface and the "theory of positive and negative terrain," presented change the slope shape (ie slope shape transformation) to improve the slope stability of the slope treatment measures.(2) In this paper, modeling of relatively simple MIDAS / GTS simulation analysis software to Longwangmiao landslide as an example, the establishment of a landslide slope shape transformation model, the slope stability analysis using the most widely used and suitable for projects dealing with the problem of nonlinear large deformation simulation software FLAC^3D numerical simulation. Considering the course of the study slope gravity stress, hydrodynamic factors, and influencing factors such as construction of dynamic load.(3) In this paper, the optimal design of slope shape transformation process, has adopted the mechanical analogy and experience research and analysis function, and ultimately to determine the best shape and slope angle of slope design. Optimal shape design of the proposed slope took into account various factors, proposed the "constant volume" principle. And draw the best slope shape design applied to simulate the working conditions later in the design, simulation analysis is verified by slope shape transformation of governance measures on slope stability.(4) This slide is designed for Longwangmiao 5 different conditions of slope shape rehabilitation programs, and its simulation study, by analyzing the different options on the slope of the relationship between the stability of law, obtained a landslide Longwangmiao Optimal design of slope shape reconstruction. Finally, an example Huanglashi landslide was carried out verification, verify that the results of further accumulation of Debris landslide control can also be changed to achieve the shape of the slope, slope shape modification in Landslide Engineering has a very good prospect of application.