摘要
依托深圳某棚户区改造项目,对超高层建筑的两根超长大直径钻孔灌注桩进行了大吨位静载试验,同时结合室内剪切试验和数值模拟,研究了组合压浆对风化岩层灌注桩承载性状的影响。结果表明,组合压浆通过改善桩周土体弹性模量,可以有效控制桩基沉降并增强桩基的侧阻和端阻,组合压浆后试桩极限承载力最大增幅达127%。组合压浆可以增强风化岩桩-土界面的抗剪强度并提升剪切强度的发挥速度。最后,基于双曲线函数构建了荷载传递子程序模型,该模型能有效地模拟出压浆前后风化岩大直径钻孔灌注桩的竖向承载特性。研究成果可对深化组合压浆大直径嵌岩桩承载特性的认识提供理论依据。
Based on the renovation project of a shantytown in Shenzhen, the large tonnage static load test of two ultra-long and large diameter bored piles was carried out. At the same time, combined with indoor shear test and numerical simulation, the influence of combined grouting on the bearing behavior of bored piles in weathered rock was studied. The results show that the combined grouting can effectively control the settlement of the pile foundation and enhance the side resistance and end resistance of the pile foundation by improving the elastic modulus of the soil around the pile. The maximum increase of the ultimate bearing capacity of the test pile after the combined grouting is 127%. Combined grouting can enhance the shear strength of weathered rock pile-soil interface and improve the speed of shear strength. The calculation model established by the load transfer curve proposed in this paper effectively simulate the vertical bearing characteristics of large-diameter bored piles in weathered rock before and after grouting. The research results can help to deepen the understanding of bearing characteristics of composite grouting large diameter rock-socketed piles.
作者
罗志聪
胡涛
万志辉
饶少华
陈飞
刘鹏远
戴国亮
LUO Zhicong;HU Tao;WAN Zhihui;RAO Shaohua;CHEN Fei;LIU Pengyuan;DAI Guoliang(Shenzhen Talents Housing Group Co.,Ltd.,Shenzhen 518000,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;Shenzhen Luohu Talent Housing Co.,Ltd.,Shenzhen 518001,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期2207-2212,共6页
Building Structure
关键词
风化岩层
大直径钻孔灌注桩
大型剪切试验
组合压浆
数值模拟
weathered rock
large diameter bored pile
large shear test
combined grouting
numerical simulation
作者简介
第一作者:罗志聪,学士,工程师,主要从事桩基工程理论研究,Email:luozc@szrcaj.com;通信作者:胡涛,博士研究生,主要从事后压浆理论与工程实践,Email:hutao_mail@seu.edu.cn。
