静压桩沉桩过程中贯入机理理论研究进展

ADVANCES IN THEORETICAL RESEARCH ON PENETRATION CHARACTERISTICS OF JACKED PILES

在静压桩的理论研究中,分析静压桩沉桩过程中贯入特性所面临的首要难题是明确静压桩贯入机理。本文以分析静压桩沉桩过程中贯入机理为基础,对静压桩沉桩的3种理论分析方法——圆孔扩张理论、应变路径法和有限元分析分别进行了总结与分析,指出了目前研究静压桩贯入机理所存在的不足,并提出了对贯入机理研究的若干建议与认识。建议在传统的圆孔扩张理论基础上,结合应变路径法加以修正,基于土的非线性、桩与土的共同作用、空间特性等对静压桩的沉桩机理本质进行分析。对静压桩贯入机理理论研究的总结为估算静压桩的施工影响提供参考,从而为静压桩的设计和施工提供更多的借鉴,带来一定的经济效益。

In the theoretical research of jacked pile,the first problem to analyze the penetration characteristics of jacked pile in the process of pile jacking is to clarify the penetration mechanism of jacked pile.Based on the analysis of penetration mechanism in the process of pile jacking,this paper summarizes and analyzes three theoretical analysis methods of pile jacking.They are circular hole expansion theory,strain path method and finite element analysis.This paper points out the shortcomings of the current research on the penetration mechanism of jacked pile and puts forward some suggestions and understandings on the penetration mechanism.Based on the traditional theory of hole expansion and the strain path method,it is suggested to analyze the nature of pile sinking mechanism of static pile based on the nonlinearity of soil,the interaction between pile and soil and the spatial characteristics.The summary of the theoretical research on the penetration mechanism of jacked pile can be helpful to estimate the construction impact range of jacked pile,so as to provide better reference for the design and construction of jacked pile and bring good economic benefits.