成层地基微型桩加固浅基础的离心模型试验研究  

Centrifugal model tests on micro-pile-reinforced shallow foundation in layered soils

作　　者：周玮宁 李子曦 张嘎[1] ZHOU Weining;LI Zixi;ZHANG Ga(Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《岩土工程学报》2024年第S01期81-85,共5页Chinese Journal of Geotechnical Engineering

摘　　要：对比了成层地基微型桩加固浅基础与不加固情况的离心模型试验,分析地基土和基础的变形破坏响应,阐明复杂地层条件下微型桩的加固机理。结果表明微型桩显著减小了浅基础的沉降量。微型桩加固的主要范围在淤泥质粉质黏土层深度4 m上方。微型桩加固下,地基的沉降更为规律均匀,粉质黏土层与淤泥质粉质黏土层的分界层附近位移变化更缓和。微型桩加固下,荷载影响区域深度减小,粉质黏土层影响区域宽度的减小幅度大于淤泥质粉质黏土层。微型桩抑制荷载向下层地层的传导,约束了下层地基的水平位移,提高地基承载力。研究得出的规律为微型桩在现实工程中的应用提供参考。The centrifugal model tests are conducted on the micro-pile-reinforced and unreinforced shallow foundations buried in complex formation during vertical loading.The deformations of soil base and the foundation are observed and compared for the micro-pile reinforcement effects.The results show that the micro-piles significantly reduce the settlement of shallow foundations.The main scope of the micro-pile reinforcement is above a depth of 4 m in the silty clay layer.Under the reinforcement of the micro-piles,the settlement of the foundation is more regular and uniform,and the displacement change near the boundary layer between the clay layer and the silty clay layer is more gentle.The depth of the load influence zone decreases if the micro-piles are used,and the width of the influence area of the clay layer is reduced by a greater extent than that of the silty clay layer.The micro-piles suppress the transmission of loads to the lower strata and constrain the horizontal displacement of the soils,thus increase the bearing capacity of shallow foundation.The rules obtained from this study may provide reference for the application of micro-piles in practice.

关 键 词：离心模型试验 复杂地层 微型桩 承载力 

分 类 号：TU470[建筑科学—结构工程]