Analysis Of Seepage Field And Slope Stability Of Earth Rock Dam Under Rainfall

Rainfall is a major cause of soil slope instability.The rainfall process will affect the seepage field and slope stability of earth rock dam slope.In order to explore the law of change,based on the theory of saturated unsaturated soil,the paper uses Geo-Studio finite element calculation software to calculate the volume water content The results of pore water pressure and permeability coefficient are calculated to reflect the whole variation law of seepage flow field,and then analyze the change law of safety coefficient;Combined with the actual project,the influence of slope slope,rainfall intensity,rainfall duration,rainfall type and boundary conditions on seepage field and slope stability of earth rock dam is analyzed,which provides reference for practical engineering.The main results are as follows:1.In seepage analysis,the permeability coefficient of soil is the direct reason for the change of seepage field.By comparing the permeability coefficient of soil layer and rainfall intensity at a certain time,the change trend of volume water content,pore water pressure and permeability coefficient in the next period of time can be predicted.2.The safety factor has a positive correlation with the shear stress of the base,the normal force and shear force of the left and right soil strips,and a negative correlation with the pore water pressure;the decreasing trend of the safety factor caused by rainfall infiltration is slow fast relatively stable;the increasing trend of the safety factor caused by rainfall dissipation is fast to slow.3.The influence depth of rainfall infiltration on the seepage field inside the dam body has a positive correlation with rainfall intensity and rainfall duration,and a negative correlation with slope gradient;the seepage characteristic parameters of peak rainfall condition have the maximum value in the interval at the end of the maximum rainfall.4.With the increase of rainfall intensity and duration,the time needed to reach the minimum value will also increase,and the smaller the value is;In the process of rainfall dissipation,with the increase of rainfall intensity and duration,the longer it takes for the safety factor to return to the initial state.5.The boundary of land climate interaction has a great influence on the topsoil,the influence depth is 0.5m,and the influence degree decreases with the deepening of the soil layer;The difference between the two boundary conditions is 0.07%;The difference of calculation results is 2.18%.