宁波软土区旋喷桩-微型钢管桩组合体竖向传力机制研究  

Study on Vertical Force Transfer Mechanism of Chemical Churning Pile-mini Steel Pipe Pile Compound Foundation in Ningbo Soft Clay

作　　者：毛志鹏 王小军 周晓宇[3] MAO Zhipeng;WANG Xiaojun;ZHOU Xiaoyu(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil and Architectural Engineering,Ningbo Institute of Technology,Zhejiang University,Ningbo 315100,Zhejiang,China;Hongrun Construction Group Co.,Ltd.,Shanghai 200235,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]浙江大学宁波理工学院土木建筑工程学院,浙江宁波315100 [3]宏润建设集团股份有限公司,上海200235

出　　处：《路基工程》2020年第2期23-28,共6页Subgrade Engineering

基　　金：宁波市科技惠民项目：宁波复杂软土地质条件下微型钢管桩的承载特性及工程应用研究（２０１７Ｃ５００２１）

摘　　要：软土区旋喷桩-微型钢管桩组合体由旋喷桩和微型钢管桩两部分组成。在组合体顶部加载的数值模拟分析中,按设置、未设置旋喷桩-桩周土界面两种状态进行计算后发现旋喷桩-桩周土之间存在界面效应,设置旋喷桩-桩周土界面的有限元模型计算得到的荷载-沉降曲线与现场实测结果较为拟合。因此,采用该模型对旋喷桩-微型钢管桩组合体的应力分担比、侧摩阻力和轴力分布规律进行计算分析和研究。The chemical churning pile-mini steel pipe pile compound foundation is composed of chemical churning pile and mini steel pipe pile. In the numerical simulation analysis of loading on the top of the compound foundation, the interface effect between chemical churning pile and the soil around it is found after calculating according to the two states of setting and not setting the interface. The load-settlement curve obtained by setting the finite element model of the interface between the chemical churning pile and the soil around it is more in line with the actual field measurement results. Therefore, the model is used to analyze and study the stress sharing ratio, side frictional resistance and axial force distribution law of chemical churning pile-mini steel pipe pile compound foundation.

关 键 词：软土 旋喷桩 微型钢管桩 组合体 荷载传递机制 

分 类 号：TU473.1[建筑科学—结构工程]