水泥土搅拌桩单桩载荷试验数值模拟分析  

NUMERICAL SIMULATION ANALYSIS OF SINGLE PILE LOAD TEST OF CEMENT-SOIL MIXING PILES

作　　者：安芃芃 杨有海[2] 付清华[1] 王运周 李铁根 周贺 AN Pengpeng;YANG Youhai;FU Qinghua;WANG Yunzhou;LI Tiegen;ZHOU He(Gansu Vocational and Technical College of Communications,Lanzhou 730070,China;Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]甘肃交通职业技术学院,兰州730070 [2]兰州交通大学,兰州730070

出　　处：《低温建筑技术》2023年第2期113-116,共4页Low Temperature Architecture Technology

基　　金：甘肃省教育厅2023年高校教师创新基金项目“新工科背景下高职院校铁道工程专业人才培养模式创新与实践研究”(2023B-349);中国铁路总公司科研项目“水泥土搅拌桩复合地基加固不同等级铁路饱和黄土地基研究”(2013G009-N);甘肃交通职业技术学院2021年学院教学改革工程项目“基于超星平台的《道路工程识图与绘图》课程混合式教学模式探索”;甘肃交通职业技术学院2021年学院教学改革工程项目“活页式讲义《隧道工程试验检测技术》”。

摘　　要：针对兰州西至中川机场城际铁路沿线分布着大量饱和黄土,由于天然承载力低,无法满足工程建设要求这一问题.依据复合地基理论,提出用水泥土搅拌桩加固饱和黄土地基.通过FLAC3D软件建立,进行承载特性分析.根据数值模拟结果,分析各级荷载作用下桩顶沉降量,绘制荷载—沉降曲线,确定单桩竖向极限承载力为210kN及承载力特征值为105kN,并与现场试验段实测值进行对比,曲线较为接近,即数值模拟能够较好的反映现场真实情况.同时,分析了桩身轴应力、桩侧摩阻力在桩顶各级荷载作用下沿深度的变化情况;最后,分析了桩端阻力和桩侧摩阻力对上部荷载的分担比例.数值模拟的结论,为类似工程的设计研究有一定借鉴作用.A large amount of saturated loess is distributed along the Lanzhou West to Zhongchuan Airport Intercity railway,in which the natural carrying capacity is low and cannot meet the requirements of engineering construction.Based on the theory of composite foundation,the soil-cement pile is proposed for strengthening the saturated loess foundation.FLAC3D software is employed to analyze the bearing characteristics.According to the numerical simula-tion results,pile top settlement under different levels of loads is analyzed,in which,we obtain the load-settlement curve;the vertical ultimate bearing capacity of single pile is determined to be 210kN and the characteristic value of bearing capacity is 105kN.Compared with the measured value in the field test section,the results from numerical simulation could better reflect the real situation on site.At the same time,the changes of pile axial stress and pile lat-eral friction along the depth under the load of pile top are analyzed.Finally,the proportion of pile tip resistance and pile side friction to the upper load is analyzed.The conclusion of numerical simulation may provide the reference in the design and research of similar engineering projects.

关 键 词：水泥土搅拌桩 FLAC3D 数值模拟 载荷试验 

分 类 号：TU473.1[建筑科学—结构工程]