Influence of trees and shrubs on the stability of landslides induced by typhoon rainstorm

Under the condition of rainfall, trees and shrubs’ leaves can reduce the slope being washed and anchoring the slope by their roots, which had a positive effect on the slope stability. However, in typhoon rainstorm season, typhoon cracks the ground through swaying vegetation, strengthens the effect of rainfall infiltration, and further reduces the matrix suction and cohesion of soil, to reduce the stability of slope. In order to explore whether trees and shrubs have a positive or negative effect on slope during typhoon rainstorm season, this paper conducted quantitative analysis through indoor model experiment and numerical simulation, comparing the influence of no typhoon, typhoon and typhoon with different intensity on slope stability. It was found that the abrupt change time of pore water pressure curve and water content curve was advanced with the typhoon developing from nothing and becoming stronger from weak. At the same time, the effect of landslide with typhoon coupled rainstorm compared the simple rainfall, the area and volume of landslide damage were larger, and the stronger the typhoon grade was, the larger the area and volume of landslide damage were.Compared the stability coefficient of simulated slope by Geo-Studio numerical simulation software verifying, the initial stability coefficient was the largest and the decline speed was the slowest under the effect of no typhoon, the typhoon was bad and under the strong typhoon condition was the worst.