Stability Analysis Of Reservoir Slopes Under The Condition Of Water Level Drawdown

In recent years,the study of slope stability has become a classic research topic in the field of geotechnical engineering,which has been concerned by many scholars.Because of the special geographical environment,the stability of the reservoir bank slope is easily affected by the change of the reservoir water level,resulting in geological disasters such as landslides and collapses.Therefore,it is of great significance to carry out the research on the stability of the reservoir bank slope under the condition of the reservoir water level falling.On the basis of previous studies,based on the principle of limit analysis kinematics,this paper studies the stability of soil and rock bank slope when the reservoir water level drops,and analyzes the impact of anti slide pile reinforcement on the slope stability,which provides a reference for the design and construction of bank slope.Finally,the slope reliability analysis is carried out to evaluate the slope stability comprehensively.The specific work is mainly carried out from the following aspects:(1)Using Boussinesq seepage equation to solve the water line equation in the bank slope when the water level of the reservoir drops,the uncertainty of the water level of the bank slope is solved.On this basis,the failure mechanism of bank slope rotation instability is constructed by using discrete upper limit mechanism.Then,the external force power and internal energy dissipation of soil(Mohr Coulomb criterion)and rock(Hoek Brown criterion)slopes are derived,and the calculation flow of safety factor is obtained and relevant programs are compiled.Based on the verification of the results,the parameters of the slope stability are analyzed,and the stability chart is drawn to fully consider the influence of the geometric properties,structure and rock mass properties of the slope.(2)The stability of the bank slope strengthened by anti slide piles is studied.The seepage equation of Boussinesq and the upper limit technique are also used to characterize and construct the saturation line and failure mechanism of the slope.The Ito formula is used to solve the distribution characteristics of pile-soil forces on the side of anti slide piles,the internal energy dissipation equation caused by pile-soil interaction is derived,the energy balance equation of slope is constructed,and the formula of safety factor is derived.For the reinforced soil slope and rock slope,the parameter analysis and stability chart are drawn respectively to fully consider the influence of each parameter on the slope stability,and compare the stability degree of the slope before and after reinforcement to evaluate the reinforcement effect of anti slide pile.(3)This paper expounds the basic concept and analysis method of reliability theory,combines the above-mentioned deterministic stability analysis results,uses the Monte Carlo method and the corresponding random variable sampling method,compiles the Monte Carlo analysis program,calculates and solves the reliability index of reservoir bank slope under the condition of reservoir water level falling,and makes further reliability research,and combines the stability research in the previous paper According to the results,the safety of reservoir bank slope is evaluated comprehensively.