饱和粘土中静压桩沉桩机理及挤土效应研究综述

Review of Penetration and Soil Compaction Effect of Pile Jacks in Saturated Clay

在分析饱和粘土中静压桩的贯入机理的基础上，对静压桩沉桩分析的圆孔扩张理论、应变路径法、有限元分析、滑移线理论和模型槽试验等五种方法逐一进行评述，并提出在传统的平面圆孔扩张理论基础上加以改进，采用准静态空间轴对称方程组对静压桩贯入过程进行模拟，从而得出土体位移、应力、初始超孔压的空间解析解，同时采用有限元分析。

Reviewed are five methods for the analysis of the penetration of jacked in piles,namely,cavity expansion method,strain path method finite element method,slip line method and calibration model test.After analysis,it is pointed out that it is more rational to adopt sub statical spatial axisy numerical formulas based on traditional plane strain cavity expansion method in the analysis.After spatial closed form solutions are obtained for soil movements,stresses and initial excessive pore pressures generated durihy pile penetration are found out.It is suggested that finite element analysis together with centrifugal model test be used in verifying the results.