Effectiveness of anti-sliding piles for Wulidui landslide under rainfall condition

Abstract

Rainfall is one of the important factors which make slope unstable. After the piles are used to strengthen the landslide, the landslide seepage field will be influenced especially under rainfall condition. The landslide stress field will change with the seepage field, which will affect the landslide stability. In order to design anti-sliding piles reasonably, the effectiveness of anti-sliding piles under rainfall condition should be studied. Wulidui landslide in Three Gorges reservoir area was taken as an example and its engineering geology was introduced. By choosing reasonable and practical soil-water characteristic curve and permeability function, the mechanic model was obtained under two typical conditions: (a) 175 m water level; (b) 3-day rainfall with intensity of 150 mm/day. With GEOSTUDIO software package, the stress field and strain field at different time without and with anti-sliding piles were simulated in SIGMA code by incorporating the seepage field obtained in SEEP code. Based on all these analyses, the landslide stability with and without anti-sliding piles before and after rainfall was evaluated. © Springer-Verlag Berlin Heidelberg 2013.