Numerical Simulation Of Seepage And Slope Stability Of Soil Embankment Under The Combined Action Of Rainstorm And Water Level Change

In recent years,more and more torrential rains caused by extreme climates are a severe test for water conservancy projects.The earth embankment,in particular,needs to withstand multiple adverse effects such as the impact of heavy rain,infiltration and rapid changes in river flow.At present,the analysis of seepage and stability under the influence of water-level change combined with different rainfall is mainly aimed at earth-rock dams at home and abroad,and there are few such studies on embankments.Based on the existing research,this paper focuses on the core issue of soil bank slope stability under the combined action of river water level fluctuation and heavy rain,using numerical simulation method and Geo-Studio software,to "slope seepage stability theoretical analysis→ numerical value" Simulation calculation and analysis plan→soil embankment seepage analysis→soil embankment slope stability analysis" is the main research line,and the key factors affecting the stability of soil embankment slope are summarized.The main research contents are as follows:(1)Theoretical analysis of the seepage stability of the soil embankment slope is carried out.On the basis of clarifying saturated-unsaturated seepage,unsaturated soil strength and the limit equilibrium theory of slope stability,the theoretical basis for the influence of torrential rain and channel water level changes on soil embankment seepage stability is clarified,and the application of Geo-Studio software is proposed.The realization method and steps of numerical simulation calculation analysis.(2)Analyze the influence of rainstorm and river water level changes on the seepage of the embankment.Using the Van Genuchten permeability coefficient prediction model,according to the saturated permeability coefficient and saturated water content of each material,the permeability coefficient curves of different materials were obtained,and how rainfall and water level changes affected the seepage of the soil embankment were analyzed.By calculating the pore water pressure of four typical dangerous points in different parts of the embankment body under heavy rain and water level changes,the dynamic change law of the pore water pressure of the earth embankment under various working conditions is obtained,and the most dangerous working conditions and dangerous positions are clarified.(3)Analyze the influence of torrential rain and changes in river water level on the slope stability of the earth embankment.Three rainfall intensities of 50mm/d,100mm/d and 200mm/d,three water level change rates of 1m/d,2m/d and 2.5m/d,and four types of average,forward,center and rear Coupled calculation is carried out for the composite working conditions of rainfall types,and different combinations are selected for analysis in turn.The most dangerous working conditions and the key factors affecting the slope stability of the soil embankment are found out,and the mechanism and dynamic change law of the different factors affecting the slope stability are discussed.The anti-seepage scheme of the closed anti-seepage wall is proposed,and the safety factor of the original embankment model under different working conditions is compared and analyzed,which effectively improves the stability of the earth embankment slope under the combined action of rainstorm and water level.This paper preliminarily discusses the key factors affecting the seepage and stability of the embankment.The research results can provide a reference basis for the slope stability design of the earth embankment under the combined action of rainstorm and water level change.