Study On The Influence Of Sudden Change Of Reservoir Water Level To Stability Of High Rock Bank Slope

Water resources in Southwest China are rich, however, in the development of water resources always encountered the representative high rock slope problems. High rock slope is a kind of important geological environments and engineering object in mountainous area construction, the high rock slope in the southwest area always has the characteristics of high and steep, complex shape, high stress and complex deformation evolution history. Water rock interaction is always the main cause of slope failure in water resources and hydropower engineering involving with high rock slope.This paper firstly get theory derivation formulas of equivalent elastic modulus through single fracture rock mass model, and verify the correctness by finite element calculation,at the same time, compared the results with the standard. Furthermore, this paper get the law of the change of equivalent modulus under the affect of boundary tensile stress and seepage force through numerical analysis.Considering pore water pressure as hydrostatic pressure,seepage force and excess pore water pressure as three parts, discuss the influence of pore water pressure on the strength of rock mass. Furthermore, get the hydrostatic pressure strength reduction formulas in case of compression shear and tensile shear. Take the influence on rock strength of excess pore water pressure as the development of fracture,the increase of excess pore water pressure and the seepage force of crack tip, and get the strength reduction formulas of these three parts.What’s more, this paper apply the theory results to the numerical analysis of engineering and discuss the seepage effect to slope stability by the results of the coupling of seepage field and stress.