Minimum pile spacing between stabilizing piles in 3D composite multilayer landslide
LIU Tao1，ZHANG Haikuang1，ZHANG You1，LI Changdong1，2
(1. Faculty of Engineering，China University of Geosciences(Wuhan)，Wuhan，Hubei 430074，China；2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu，Sichuan 610059，China)
Abstract：The current researches on the pile spacing of stabilizing piles mainly focus on the two-dimensional landslide model with a single homogeneous layer. However，substantial evidence indicates that a large number of landslides in the actual engineering practice have the characteristics of multi-layer structure. A three-dimensional multi-layer landslide model was developed to analyze the formation of the soil arching behind the piles and the four-stage process of soil arching. Furthermore，an improved strip method was presented based upon the presented three-dimensional multi-layer landslide model. The most dangerous sliding body can be obtained via the improved strip method accordingly. The distribution function of the driving force and the distribution function of soil resistance in landslide mass were introduced to accurately describe the stress distribution in the soil arching. In view of the balance condition of arching in the most dangerous sliding body，the strength condition of the unified strength theory and conditions for soil behind pile to play a role，two methods of calculating the minimum pile spacing and correspondingly two layout schemes for stabilizing piles were put forward. The calculation results of the Houba landslide and the Bazimen landslide show that two optimized layout schemes of stabilizing piles reduce the stabilizing pile ratio at least 12% than the conventional layout scheme of stabilizing piles.
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2018, Vol. 37 
