Control of Rainfall Infiltration Characteristics of Loess Slope by Vertical Fissure
In order to study the influence of vertical crack infiltration on loess slopes under rainfall conditions,a loess slope model with vertical cracks is established by using the Seep/W module in the finite element software Geosdtudio,based on geological data from the northwest China,the vertical fissures in the loess side slope under rainfall conditions are numerically analyzed.The results show that cracks have a significant impact on the seepage field and displacement field of the loess slope.Cracks serve as preferential channels for rainwater infiltration,al-lowing rainwater to quickly permeate through the bottom and sidewalls of the cracks into the surrounding soil and spread outwards.The position of the vertical crack results in differences in the volumetric water content of the soil at different locations.Specifically,the soil volume moisture content on the left side of the fissure 1 m away from the fissure is 2%higher than that on the right side,and the soil in the upper part of the crack has 1%higher vol-umetric water content compared to the lower part.Due to the soil gravity and fracture angle,the fracture has a more significant influence in the y-direction,and the existence of the fracture will lead to the redistribution of stress in the soil,resulting in the landslide deformation of the loess slope.