基于土塞效应的柱形孔扩张问题解析解

钢管桩和混凝土管桩在沉桩过程中会同时产生挤土效应和土塞效应,然而目前国内外学者对钢管桩的研究主要侧重于其土塞效应,对混凝土管桩的研究则主要集中在其挤土效应上。首先综述了国内外管桩挤土效应和土塞效应的研究现状,然后在考虑土塞效应的前提条件下,利用圆孔扩张理论对管桩的挤土效应进行了分析研究。通过合理的假设,得到了桩周土体在弹塑性阶段的应力场和位移场的解析解答,为综合研究管桩的挤土效应和土塞效应提供了一种新的思路。

ANALYTICAL SOLUTIONS OF CYLINDRICAL CAVITY EXPANSION PROBLEMS CONSIDERING PLUGGING EFFECTS

During the driving process of steel-pipe pile and concrete pipe pile,the squeezing effect and plugging effect will be generated.At present,the plugging effect is emphatically studied for steel pipe piles,and much attention is paid to the squeezing effect of concrete pipe pile.The state-of-art on squeezing effect and plugging effect of the pipe pile are firstly reviewed.Considering the plugging effect of the pipe pile,the cavity expansion theory is applied to studying the squeezing effect of pipe pile.Based on the reasonable assumptions,the elastoplastic analytical solutions for stress field and displacement field of the soil around the pile are presented.This new way can be employed to study the squeezing effect and the plugging effect synthetically.