Study On The Slope Stability Of Binary Mixed Embankment Under Seepage Flow

Embankment,as a water retaining structure for rivers and lakes,plays a self-evident role in preventing floods.Research on stability of mass dike slope under seepage involves cross-disciplinary knowledge of hydraulics and soil mechanics.It is of great practical value for engineering to explore unstable seepage under different descending speeds and consider the influence of coupling analysis of seepage field and stress field on the stability of dike slopeIn this paper,theoretical analysis,sand tank model experiment and numerical simulation are mainly combined to study the change rule of unstable seepage field and its influence on the stability of embankment slope,and the deformation of embankment slope under the coupling effect of seepage field and stress field is considered.Firstly,the basic theory of seepage is discussed.On this basis,the physical change process of unstable seepage and the deformation of the bank slope of sandy soil and clay materials when the water level drops are accurately obtained through scale relation and sand tank model experiment.The stability of the bank slope due to unstable seepage in the process of sudden drop is mainly studiedBased on the sand tank model test results and the limit equilibrium method adopted by the numerical simulation software Geo-Studio,the variation law of safety factor of binary mixed soil embankment slope under the action of water level drop was studied,and the influence of fluid-solid coupling on the stability of embankment slope and the displacement occurred were further explored.At the same time,the finite element software COMSOL Multiphysics is used to explore the displacement,plastic through zone and reduced safety factor of the embankment slope under the condition of sudden drawdown of water level by finite element strength reduction method,thus comparing and analyzing the slope stability with the limit equilibrium methodAccording to the topography measured by the topographic survey system,the law of topographic change under different descending speeds is analyzed,and the descending speed has a great influence on the topography of the dike slope.The numerical simulation shows that the seepage force is a sliding force that is not conducive to the stability of the dike slope Considering the fluid-solid coupling effect,the sand-clay interface is prone to contact erosion and seepage damage under the action of water level drop.The analysis shows that different drop rates have different degrees of influence on the stability of the dike slope,and the greater the drop rate,the greater the influence on the dike slope.In this paper,the results of sand tank model test and numerical simulation are compared and analyzed,and the similar and effective laws are obtained to prove the reliability of the research.