水泥土搅拌桩长芯复合地基桩土应力比计算研究  

Study on calculation of pile-soil stress ratio of cement-soil mixed pile with long core composite foundation

作　　者：付颖 王先亚 曾玉昆 易凯 肖尊群[2] FU Ying;WANG Xianya;ZENG Yukun;YI Kai;XIAO Zunqun(Hubei Communications Investment Construction Group Co.,Ltd.,Wuhan 430058,Hubei,China;School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan 430074,Hubei,China)

机构地区：[1]湖北交投建设集团有限公司,湖北武汉430058 [2]武汉工程大学资源与安全工程学院,湖北武汉430074

出　　处：《工程建设》2024年第10期21-30,共10页Engineering Construction

基　　金：国家自然科学基金资助项目(51308424)。

摘　　要：桩土应力比是复合地基的重要设计参数,加芯搅拌桩复合地基桩土应力比的计算是一个工程技术难题。针对长芯搅拌桩,采用“截面法”将其划分上部等芯桩和下部刚性桩:前者采用考虑柔性性荷载作用下的侧阻分段非线性分布模式,后者采用线性侧阻分布模式;采用叠加原理计算长芯搅拌桩的桩土应力比。研究表明:高填方路堤柔性荷载作用下,侧阻分段非线性分布模式提高了桩的竖向荷载的分担比。桩径越大、桩长越长,桩土应力比越大。桩长对桩土应力比的影响幅度大于桩径。本文结果可为相关研究提供参考。The pile-soil stress ratio is an important design parameter of composite foundation, and the calculation of the pile-soil stress ratio of composite foundation with mixed core pile is a difficult engineering problem.For long core mixing pile, the section method is used to divide the upper equal core pile and the lower rigid pile.The former adopts the sectional nonlinear distribution model of lateral resistance under flexible load, while the latter adopts the linear lateral resistance distribution model and adopts the superposition principle to calculate the pile-soil stress ratio of long-core stirred pile.The results show that the lateral resistance segment nonlinear distribution model increases the vertical load sharing ratio of pile under the flexible load of high fill embankment.The larger the pile diameter and the longer the pile length, the greater the pile-soil stress ratio.The influence of pile length on pile soil stress ratio is greater than that of pile diameter.The results can provide references for similar study.

关 键 词：长芯水泥土搅拌桩 桩侧摩阻力 复合地基 桩-土应力比 截面法 

分 类 号：TU470[建筑科学—结构工程]