粉质黏土中包裹式散体材料桩复合地基承载特性  

Bearing Characteristics of Composite Ground of Pulverized Clay-geosynthetic Encased Stone Columns

作　　者：杨榕 张建经[2] 王志佳[3] 黎洪磊 李良勇 YANG Rong;ZHANG Jian-jing;WANG Zhi-jia;LI Hong-lei;LI Liang-yong(China Construction Road and Bridge Group Co.,Ltd,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;College of Civil Engineering and Architecture,Hainan University,Haikou 570228,China)

机构地区：[1]中建路桥集团有限公司,成都610031 [2]西南交通大学土木工程学院,成都610031 [3]海南大学土木建筑工程学院,海口570228

出　　处：《科学技术与工程》2023年第19期8358-8369,共12页Science Technology and Engineering

基　　金：国家自然科学基金(51708163)。

摘　　要：为探究包裹式散体材料桩在粉质黏土地基中的应用和包裹式散体材料桩复合地基的承载特性。根据实际路基工程的特点,采用室内模型静载试验方法,研究了粉质黏土中包裹式散体材料桩复合地基的承载特性、应力传递规律和孔隙水压力变化规律,试验结果表明:包裹式散体材料桩复合地基的承载能力和变形特征主要受包裹的长度和包裹材料的强度的影响。随着包裹材料的强度的提高,包裹式散体材料桩复合地基的承载能力也随之增加;包裹式散体材料桩复合地基的超静孔隙水压力随散体材料桩的包裹材料的强度和包裹长度的增大而减小,不同加固形式下复合地基的超静孔隙水压力随着应力的增加而非线性增长,加载初期,增长较快,随着加载地进行,后期的增长变缓,并会趋于稳定;最后根据现行的建筑地基设计规范和已有包裹式散体材料桩复合地基的设计方法的研究资料,对粉质土包裹式散体材料桩复合地基的设计计算方法进行了总结归纳,并与试验结果进行了对比,计算结果与试验结果较为一致。In order to explore the application of wrapped bulk material pile in silty clay foundation and the bearing characteristics of wrapped bulk material pile composite foundation.According to the characteristics of the actual subgrade engineering,the indoor model static load test method was used to study the bearing characteristics,stress transfer law and pore water pressure change law of the wrapped bulk material pile composite foundation in silty clay.The test results show that the bearing capacity and deformation characteristics of the wrapped bulk material pile composite foundation are mainly affected by the length and strength of the wrapped material.With the improvement of the strength of the wrapped material,the bearing capacity of the wrapped granular material pile composite foundation also increases.The excess pore water pressure of the composite foundation with wrapped bulk material pile decreases with the increase of the strength and length of the wrapped material of the bulk material pile.The excess pore water pressure of the composite foundation under different reinforcement forms increases nonlinearly with the increase of the stress.At the initial stage of loading,the increase is faster,and with the loading,the growth in the later stage slows down and tends to be stable;Finally,according to the current building foundation design code and the existing research data on the design method of wrapped bulk material pile composite foundation,the design and calculation method of silty soil wrapped bulk material pile composite foundation is summarized and compared with the test results,and the calculation results are relatively consistent with the test results.

关 键 词：粉质黏土地基 包裹式散体材料桩复合地基 室内试验 超静孔隙水压力 

分 类 号：TU473.1[建筑科学—结构工程]