Ito塑性变形理论的抗滑桩临界桩间距分析

Analysis of Critical Spacing of Anti-sliding Piles Based on Soil Arching Effect

日本学者Ito与Matsui(1975)提出的塑性变形理论,在抗滑桩加固边坡分析中得到了广泛的应用.该理论不但考虑了桩径和桩间距,而且很好地考虑了滑坡中桩-土的相互作用,但是对临界桩间距没有明确的界定.实际情况表明滑坡推力是通过桩间土拱向桩传递的,桩间成拱效应又受桩间距的影响,因此研究抗滑桩在支挡边坡工程中的土拱效应和临界桩间距有其理论与现实意义,本文将结合此理论桩间的破坏形式,对临界桩间距进行分析,给出合理的临界桩间距以指导抗滑桩加固边坡设计.

Ito＇s plasticity theory that was put forward by Japanese scholars Ito and Matsui,which considered not only the diameter and spacing between piles but also the interactional effect between piles and soils.This theory does not confine the critical spacing between piles,but in practical,the lateral force acting on the piles transfers by soil arch between piles,the soil arch affected by the spacing between piles,so it is significant in practice and on theory to study the soil arching effect and critical spacing between piles in the slope engineering that reinforced by anti-sliding piles.In order to make it more applicable to the slope engineering that reinforced by anti-slide piles,this paper studied the critical spacing between piles and considering the yield form of Ito＇s plasticity theory at the same time.