Rainfall infiltration is an important factor that causes instability of inland waterway bank.In the current numerical analysis of slope stability under rainfall infiltration conditions

the distribution of saturation degree and pore water pressure at the vertical section is mainly studied for different rainfall patterns

but rainfall intensity

rainfall duration and permeability coefficient of saturated soil also significantly affect the distribution of saturation degree and pore water pressure along the depth

thus affecting the slope stability condition.Many of the rainfall-induced slope instability events occurred sometime after the rainfall had stopped

currently there are few numerical simulations to study the stability of bank slopes after rainfall stops.When the rainfall intensity is close to the saturation permeability coefficient of slope soil

the stability of the bank slope is the most unfavorable.The current study does not consider the effect of rainfall intensity on the slope stability due to the change of saturated soil permeability coefficient.In view of the above problems

this paper analyzes the rainfall effect on the slope stability

pore water pressure

slope deformation and safety factor through the establishment of ABAQUS finite element numerical model.The results show that the infiltration of rainfall will cause the saturation and pore water pressure of the shallow soil in the bank slope to rise sharply.The seepage of the rainwater and the matric suction will deform the bank soil

and severe rainfall will cause serious plastic damage of the shallow soil.When the rainfall intensity is constant

with the increase of rainfall duration

the stability of the bank decreases

and when the soil permeability coefficient is small

the minimum safety factor of the bank appears at a certain moment after the rainfall ends;The effect of soil permeability coefficient on bank stability needs to be considered in combination with rainfall intensity.