微型桩加固浅基础的离心模型试验研究

doi:10.11779/CJGE2021S2013

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摘要微型桩被广泛应用于建筑物加固等工程领域。进行了微型桩加固浅基础与不加固情况的加载离心模型试验,观测并对比了加固和不加固条件下基础和地基的变形响应,分析了微型桩加固浅基础的规律。结果表明微型桩将荷载传导至持力层,承担的荷载占比在75%以上。微型桩显著减小了浅基础的沉降量且使得地基变形更均匀。微型桩对地基沉降的影响范围主要在浅基础宽度的1.5倍范围内。与未加固方案相比,微型桩加固方案的荷载影响区域深度偏小。研究得出的规律为微型桩在现实工程中的应用提供参考。

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	李子曦
	罗方悦
	张嘎

关键词 ：离心模型试验, 微型桩, 浅基础, 加固, 承载力, 变形

Abstract：Micro-piles are widely used in geotechnical projects such as foundation reinforcement. The centrifugal model tests are conducted on the micro-pile-reinforced and unreinforced shallow foundations during vertical loading. The deformations of the foundation and soil base are observed and compared for the micro-pile reinforcement effect. The test results show that the micro-piles transfer the vertical loads to the bearing stratum. The micro-piles bear the loads with a proportion of more than 75%. The micro-piles significantly decrease the settlement of shallow foundation and cause the soil deformation to a more uniform distribution. The micro-piles influence the soil deformation within a zone with a 1.5 times the width of the shallow foundation. The depth of the load influence zone decreases if the micro-piles are used. The new findings may provide references for the applications of micro-piles in practice.

Key words： centrifugal model test micro-pile shallow foundation reinforcement bearing capacity deformation

收稿日期: 2021-08-15

ZTFLH:

TU43

基金资助:清华大学自主科研计划课题; 国家自然科学基金重点项目（52039005）

通讯作者: *（E-mail: zhangga@tsinghua.edu.cn）

作者简介: 李子曦(2001—),男,本科生,主要从事基础工程方面的研究。E-mail: lizixi20@mails.tsinghua.edu.cn。

引用本文:

李子曦, 罗方悦, 张嘎. 微型桩加固浅基础的离心模型试验研究[J]. 岩土工程学报, 2021, 43(zk2): 56-59. LI Zi-xi, LUO Fang-yue, ZHANG Ga. Centrifugal model tests on micro-pile-reinforced shallow foundation. Chinese J. Geot. Eng., 2021, 43(zk2): 56-59.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE2021S2013 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2021/V43/Izk2/56

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