开孔管桩真空固结提高承载力模型试验

doi:10.3785/j.issn.1008-973X.2022.07.007

浙江大学学报(工学版)

2022, Vol. 56

Issue (7): 1320-1327 DOI: 10.3785/j.issn.1008-973X.2022.07.007

土木工程、水利工程、交通工程

开孔管桩真空固结提高承载力模型试验

唐晓武1,2(

),邹渊1,2,林维康1,2,赵文芳1,2,王天琦1,2

1. 浙江大学滨海和城市岩土工程研究中心，浙江杭州 310058
2. 浙江省城市地下空间开发工程技术研究中心，浙江杭州 310058

Model experiment on improving bearing capacity of perforated pipe piles by vacuum consolidation

Xiao-wu TANG1,2(

),Yuan ZOU1,2,Wei-kang LIN1,2,Wen-fang ZHAO1,2,Tian-qi WANG1,2

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou 310058, China

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摘要：

为了研究桩基承载力的增长程度、桩周土的抗剪强度和含水率变化规律、桩周土排水量，开展真空固结模型试验，得到模型桩的Q-s曲线、桩周土的十字板强度和含水率的分布规律、排水量随时间的增长曲线. 结果表明，在该试验条件下，开孔管桩真空固结技术可以使桩基承载力提高2.7倍，使桩周形成厚4.5 cm、较高抗剪强度、较低含水率的致密层. 研究桩身开孔布置的影响，得出桩基承载力的增长程度受开孔层间距的影响较大，受孔径的影响很小.

关键词： 开孔管桩; 真空固结; 承载力; 黏土

Abstract:

Vacuum consolidation model tests were conducted in order to analyze the growth degree in bearing capacity of pile foundation, the variation of shear strength and water content of soil around the pile, as well as the water discharge of surrounding soil. The Q-s curves of model piles and the distributions of vane shear strength and water content of soil around piles, and curves of water drainage with time were obtained. Results show that the vacuum consolidation technology can increase the bearing capacity of pile foundation by 2.7 times under the conditions of the tests, and form a dense layer around the pile, which is 4.5 cm thick with relatively high shear strength and relatively low water content. The influence of holes layout was analyzed. The bearing capacity of pile foundation was greatly affected by the spacing of hole layers, but little affected by dimension of holes.

Key words: perforated pipe pile vacuum consolidation bearing capacity clay

收稿日期: 2021-07-06 出版日期: 2022-07-26

CLC:

TU 473

基金资助: 国家自然科学基金资助项目(51779218)；浙江省水利科技计划资助项目(RB2027)

作者简介: 唐晓武（1966—），男，教授，博导，从事软土地基处理、土工合成材料及土遗址保护的研究. orcid.org/0000-0002-0916-8761. E-mail： tangxiaowu@zju.edu.cn

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引用本文:

唐晓武,邹渊,林维康,赵文芳,王天琦. 开孔管桩真空固结提高承载力模型试验[J]. 浙江大学学报(工学版), 2022, 56(7): 1320-1327.

Xiao-wu TANG,Yuan ZOU,Wei-kang LIN,Wen-fang ZHAO,Tian-qi WANG. Model experiment on improving bearing capacity of perforated pipe piles by vacuum consolidation. Journal of ZheJiang University (Engineering Science), 2022, 56(7): 1320-1327.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.07.007 或 https://www.zjujournals.com/eng/CN/Y2022/V56/I7/1320

图 1 真空固结装置的示意图

图 2 真空固结装置的实物图

表 1 模型桩的开孔参数

图 3 模型桩（试验组Ⅰ）

表 2 土样的基本物理参数

图 4 土样的e-p曲线

图 5 模型桩P1排水量随抽真空时间的变化曲线

图 6 单桩静荷载试验的加载阶段

图 7 十字板强度和含水率的测点布置

图 8 试验组Ⅰ模型桩的Q-s曲线

图 9 试验组Ⅱ和Ⅲ各模型桩的Q-s曲线

图 10 模型桩P1桩周土不同位置的十字板强度

图 11 试验组Ⅱ和Ⅲ中E列测点的十字板强度

图 12 模型桩P1桩周土不同位置含水率

图 13 试验组Ⅱ和Ⅲ中F列测点的含水率

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