The Reservoir Hank Roadbed Slope Stability Analysis Based On FLAC3D

This paper，combined with domestic and foreign research present situation, basedon the analysis of engineering geological characteristics of landslide in reservoir area ofLengqing highway landslide,collected geotechnical investigation report of Lengqinghighway, analysed the distribution and characteristics of bank slope of reservoir areaof Lengqing highway. Take any before and after50meters of highway k10ordinatedirection as the research object，building numerical calculation model of reservoir bankslope of Lengqing highway under the operating condition，and analyzing the variationtrends of stability of the reservoir bank slope under variation of water level, earthquake，combined action of earthquake and water level and rainfall conditions，in the process ofreservoir operation. Main research work and results in this paper include the followingaspects:1) Through a systematic analysis of the traditional method and the finite elementstrength subtraction of slope stability of bank slope subgrade reservoir. points out the ofsuperiority that finite element strength subtraction used in the analysis of reservoir banksubgrade slope of complex geological environment.2) According to the geotechnical investigation report, the paper analyzes type,distribution and characteristics of bank slope in the reservoir area of the Lengqinghighway. On the basis of the analysis above, built three-dimensional model according tothe actual situation of side slope. based on the elastic constitutive model and Moore-coulomb yield criterion, conduct numerical modeling of the side slope with finitedifference method.then take a calculation analysis of the slope stability with FLAC3Dunder variation of water level; figure out safety coefficient under different water levelsat the same time, find out the worst water level of side slope and the relationship ofslope stability and variation of water level in bank slope of reservoir.3) On the basis of the above model, first of all, conduct dynamic calculation andanalysis of the model without considering the water level, then, take calculating andanalysis of slope stability of bank slope in reservoir under geological process inearthquake magnitude：6or7, find out inconsistency influence that the earthquakeimpact each part of side slope. Then, selecting the normal water level, and consideringthe earthquake action, taking analytical calculation of slope stability, coming to someregularity of coupling action of the slope. 4) On the basis of the above model, after the maximum rainfall in a fixed day，analyzing roadbed slope stability of bank slope in reservoir under the continuous rainfor1hour,2hours,6hours,12hours, finding out some regularity of influencing thatrainfall impact on slope stability.