Study On Slope Stability And Early Warning Analysis Of Reservoir Water Level Lifting

With a reservoir landside as an example, on the basis of investigation and study of the geological environment, using Geo-Studio software analysis the wide distribution the strongly weathered argillaceous sandstone and marl type of slope in the reservoir water level lifting, its seepage characteristics, water-rock interaction, stability and prediction and forewarning criterion. Using SEEP/W and SIGMA/W module study the changing rule of the seepage, the changing rule of the stress field and displacement field under the reservoir water level lifting effects, and based on the results of seepage computation and stress and strain results for landslide stability analysis and comprehensive evaluation under the Finite Element Method and the Limit Equilibrium Method.The first chapter carry the detailed elaboration on the domestic and foreign research present situation, collect and collate the saturated-unsaturated seepage situation, the fluid-structure coupling interaction situation, the slope stability analysis situation and the prediction and forewarning research situation.The second chapter illustrate and derivate the theory of the seepage, the theory of the fluid-structure coupling interaction and the theory of slope stability analysis; describes and analyzes the analysis method and formulas involved in the numerical simulation software in the paper.The third chapter take the uncoupled analysis by the unsaturated soil seepage analysis SEEP/W software, take a comprehensive simulation of seepape analysis under the reservoir water level lifting. With a engineering example, analyzing the change characteristics of pore water pressure and the seepage velocity dynamic change rule of the slope, providing the seepage results for the use of the coupled seepage and deformation analysis in SEEP/W and SIGMA/W module.The fourth chapter take the fluid-structure coupled interaction by SEEP/W and SIGMA/W module under the water level lifting, use the coupling analysis theory of seepage field and stress field, study the changing rule of stress field and displacement field of the strongly weathered argillaceous sandstone and marl of the dominated reservoir slope under the change of the reservoir water level. It analyzes the change rules and results of the displacement field and the stress field by the finite element method.The fifth chapter analyze the mechanics effect of the landslide rock mass under the reservoir water lifting, take the landslide stability analysis and the comprehensive evaluation by the finite element method and the limit equilibrium method based on the results of the seepage calculation and stress calculation results.The sisth chapter analyze the prediction and forewarning of reservoir slope, put forward the landslide displacement, the stability coefficient and the macroscopic phenomena as landside prediction and forewarning criterion based on the above research results of the seepage field, stress field and displacement field. It takes the sensitivity analysis of slope soil shear strength parameters, internal friction angle and cohesion.