Study On Optimization Method Of Stability Analysis Of Bank Bank Slope Based On Double Parameter Reduction Method

In this paper,the shortcomings of traditional stress reduction method and the existing limitation of FLAC3 D software in the analysis of unsaturated seepage flow are optimized.By double parameter strength reduction method and self-made pore pressure field conversion procedure(seep/w To flac3d),the seepage field and the stability variation law of the bank slope under the reservoir water level are obtained(Consider the impact of reservo ir water level change rate),which provides a reference for the future analysis,evaluation and prevention of wading slope.The development and application of FLAC3 D software in unsaturated seepage analysis has been further explored,and it has positive practical significance.The main achievements of this paper are as follows:(1)Based on the theoretical analysis,the formula of double parameter strength reduction is considered,which is more in line with the actual failure mechanism of slope rock and soil,which provides a reference for more accurate evaluation of slope stability.The determination of residual strength always has some uncertainties.The decay order interval coefficient an obtained in this paper also provides a theoretical basis for explaining the residual cohesion and residual internal friction angle.(2)In this paper,GeoStudio,a two-dimensional seepage calculation software,is used to analyze a landslide case,and the seepage field and stability of the bank slope under different water seepage are obtained.The results show that the safety factor of the slope decreases first and then increases,and the most dangerous water level exists in the reservoir water level rise stage.The safety factor of the slope decreases gradually.The results show that the safety factor of bank slope stability increases and decreases when the rise rate of reservoir water increases or decreases during the rise of reservoir water level.During the period of decrease of reservoir water level,the bank water level decreases When the decrease rate of reservoir water increases or decreases,the safety factor of bank slope stability decreases and increases respectively.(3)In this paper,GeoStudio and FLAC3 D are used to study the computational model and theory of GeoStudio and FLAC3 D.Based on the fish parameterized language,the seep field conversion program(seep/w to flac3d)is compiled.This program adopts the operation mode of neighborhood interpolation and node traversal.The problem of reanalysis of seepage field of the same kind of slope is realized,which provides the possibility for the verification of the idea.(4)The stability of a landslide case considering the effect of two-parameter reduction and unsaturated seepage flow is analyzed and calculated in FLAC3 D.The same stability curve is obtained by using Morgenstern-Price method in GeoStudio(slope/w).An analysis method for analyzing the stability of wading bank slope is proposed to solve the limitation of FLAC3 D on unsaturated seepage problem.