Study on Atabiklity of Cuanzhumal Landlide fo the Three Gorgers Regovier
|School||Chengdu University of Technology|
|Keywords||Landslide Unsteady seepage DRAWDOWN Stability Analysis Stress field Displacement field|
Run after the Three Gorges Reservoir, the reservoir level each year in the 145m ~ 175m cyclical fluctuations, the reservoir water level luffing up to 30m. Soak to soften role of reservoir water, groundwater level fluctuations caused by rainfall and reservoir water level fluctuation will reduce the the reservoir banks geotechnical shear strength, stability, and affect existing landslide might otherwise stable slope landslide such a serious threat to the safety of life and property of the normal operation of the Three Gorges reservoir area and the coastal people. Therefore landslide stability and its changing trends of the reservoir operation process to become an important issue. Reservoir running trend of landslide stability not yet a unified understanding, and in research and practical projects, there are entirely dependent on the numerical simulation software or generalization based on experience, so that the subjectivity of the outcomes is relatively large. In this paper, on the basis of summing up the results of previous studies, select Yunyang County, Sichuan main temple landslide as the research object to study the stability of the landslide in the decline in the water level and rainfall under adverse conditions, the major research content and results are as follows: a pair Sichuan The natural geography, topography, lithology, geological structure of the main temple area geological environment conditions for the elaboration and analysis. b. elaborate on the basic characteristics of the main temple Sichuan landslide hydrological conditions and the deformation and failure characteristics on deformation monitoring data were analyzed with a further analysis of the mechanism of landslide damage. c. In this paper, a small amount of test data according to the mathematical model of seepage function fitting; physical and mechanical parameters of the landslide is the use of test engineering analogy and inversion analysis of three methods to determine. d. expounded the basic principles of unsaturated flow, and the use of two-dimensional seepage analysis software landslide the rate of decline in the water level in different water level decline in working conditions and rainfall coupled seepage field changes, draw mode in different moments infiltration lines, pore water pressure, total head contour map, and its analysis, and this on the basis of the seepage field numerical calculation introduced based on unsaturated soil shear strength theory, the use of ordinary law, Morgenstern- the Price Law on Janbu Law and Bishop Law stability calculation of the main temple in Sichuan, derived various conditions Chuan main temple landslide stability coefficient of variation, and the results were analyzed to explore the parameters change of slope stability impact. e. use of the FLAC3D three-dimensional software to analyze the overall stability of the landslide in the natural state and a stable water level conditions, comparative analysis of the two conditions of stress field, displacement field. The analysis results show that the main temple Sichuan landslide in the course of normal operation of the reservoir as a whole is basically stable, not the overall instability of decline, only the local surface and weathering boundaries at a certain degree of deformation and failure may occur.