固化土-微型桩复合地基桩-土应力比分析  

Analysis of Pile-Soil Stress Ratio of Composite Foundation Reinforced by Solidified Soil-Micro Piles

作　　者：张帅 王瑞春 朱绍东 郑媛媛 曹玉鹏 ZHANG Shuai;WANG Ruichun;ZHU Shaodong;ZHENG Yuanyuan;CAO Yupeng(Guangzhou Municipal Engineering Design&Research Institute Co Ltd,Guangzhou 510095,China;The Fourth Prospecting of Shandong Coal Geology Bureau,Weifang 261061,China;School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,China;College of Civil and Transportation Engineering,Weifang University,Weifang 261061,China)

机构地区：[1]广州市市政工程设计研究总院有限公司,广东广州510095 [2]山东省煤田地质局第四勘探队,山东潍坊261061 [3]中山大学土木工程学院,广东珠海519082 [4]潍坊学院土木与交通学院,山东潍坊261061

出　　处：《土木工程与管理学报》2025年第1期27-33,共7页Journal of Civil Engineering and Management

基　　金：山东省自然科学基金(ZR2021ME068);广东省住建厅科技创新计划(2022-K4-094918)。

摘　　要：固化土褥垫层与微型桩复合地基连用,对小净高条件下软土地基处理有着较强的适用性。为研究固化层对微型桩复合地基桩-土应力比的影响,分析了路堤填土荷载作用下微型桩复合地基的受力和变形。将侧摩阻力简化为两段折线式,同时考虑了桩体的向上刺入和向下变形,推导了微型桩中性面(等沉面)深度,分别计算了中性面上下沉降,根据固化土层-桩-桩间土协调变形关系,采用迭代法求解了中性面位置,进而得到了固化土-微型桩桩土应力比,并基于某道路,将计算结果与实测结果进行了对比分析。结果表明:固化土层的设置可以有效提高微型桩复合地基的承载特性;微型桩桩长较长时,采用分段函数对侧摩阻力进行修正,可以较好地反应长桩的变形和承载特性。The combination of solidified soil layer and micro-pile composite foundation has strong applicability to the treatment of soft soil foundation under the condition of subclear height.In order to study the effect of solidified layer on the pile-soil stress ratio of micro pile composite foundation,the stress and deformation of micro pile composite foundation under the load of embankment are analyzed.The lateral friction resistance is simplified into a two-section broken line.The upward penetration and downward deformation of the pile body are also considered.The depth of neutral surface(equal settling surface)of micro pile is deduced.The upper and lower settlements on the neutral plane are calculated,respectively.The pile-soil stress ratio of solidified soil-micro pile is solved according to the coordinated deformation relationship of solidified soil layer-pile-pile soil.The results show that the setting of solidified soil layer can effectively improve the bearing characteristics of micro pile composite foundation.When the length of the micro pile is long,using a piecewise function to correct the lateral friction resistance can better reflect the deformation and bearing characteristics of the long pile.

关 键 词：复合地基 固化土 微型桩 桩-土应力比 

分 类 号：U416[交通运输工程—道路与铁道工程]