A new method to calculate lateral force acting on stabilizing piles based on multi-wedge translation mechanism

LUO Yu(罗渝)^{1, 2, 3}, XU Qiang(许强)³, HE Si-ming(何思明)^{1, 2}, LI Xin-po(李新坡)^{1, 2}, HE Jin-chuan(何尽川)⁴, WU Yong(吴永)^{1, 2, 3}

(1. Key Laboratory of Mountain Hazards and Surface Process, Chinese Academy of Sciences, Chengdu 610041, China;
2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection
(Chengdu University of Technoloy), Chengdu 610059, China;
4. Southwest Municipal Engineering Design & Research Institute of China, Chengdu 610081, China)

Abstract:A new method based on the multi-wedge translation mechanism is presented to calculate the lateral force acting on the stabilizing piles. At first, there is no assumption for the shape of potential sliding surface, it is just considered that the potential sliding surface is a composite of a number of straight lines. And then, the potential sliding mass is divided into a number of triangular wedges take with these straight lines as its base. The kinematic theorem of limit analysis is adopted to calculate the rate of external work and the rate of energy dissipation for each triangular wedge, respectively. Furthermore, the multivariate functions are established to calculate the lateral force acting on the stabilizing piles. The lateral force and the corresponding potential sliding surfaces can be obtained by an optimizational technique. At last, an example is taken to illustrate the method. The effect of soil strength parameters, slope angle and pile roughness on the lateral force and the corresponding potential sliding surface are analyzed. The result are compared with those obtained using other methods.

Key words:pile; sliding surface; limit analysis; multi-wedge mechanism