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浙江大学学报(工学版)
浙江大学学报(工学版)  2023, Vol. 57 Issue (7): 1374-1381    DOI: 10.3785/j.issn.1008-973X.2023.07.012
土木工程     
方桩-水泥土接触面摩擦特性试验研究
任建飞1,2(),周佳锦1,2,*(),龚晓南1,2,俞建霖1,2
1. 浙江大学 滨海与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
Experimental study on frictional capacity of square pile-cemented soil interface
Jian-fei REN1,2(),Jia-jin ZHOU1,2,*(),Xiao-nan GONG1,2,Jian-lin YU1,2
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. Engineering Research Center of Urban Underground Space Development of Zhejiang Province, Hangzhou 310058, China
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摘要：

通过一系列三维桩土接触面剪切试验，研究方桩–水泥土接触面的摩擦特性，主要研究方桩边长、水泥土龄期对接触面摩擦特性的影响. 研究结果表明，方桩–水泥土接触面最大桩顶荷载随着方桩边长的增加而呈现先增大后减小的趋势，方桩–水泥土接触面最大桩顶荷载随着养护时间的增加而增加. 方桩–水泥土接触面的最大侧摩阻力随着方桩边长的增加而减小. 方桩边长的增加，即水泥土厚度的减小，使得方桩–水泥土接触面的破坏模式由渐进破坏转变为脆性破坏. 方桩–水泥土接触面最大侧摩阻力随着养护时间的增加而增加，即最大侧摩阻力随着水泥土强度的增加而增大. 在剪切试验过程中，方桩角点处出现应力集中，不利于方桩–水泥土接触面摩擦特性的发挥.
关键词： 静钻根植桩;  方桩–水泥土接触面;  三维剪切试验;  方桩边长;  龄期    
Abstract:

A series of three-dimensional pile-soil interface shear tests were conducted to analyze the frictional capacity of square pile-cemented soil interface. The effects of side length of square pile and curing time on frictional capacity of interface were mainly analyzed. The test results show that the maximum load of square pile-cemented soil interface increased first and then decreased with the increase of side length of square pile. The maximum load of square pile-cemented soil interface increased with curing time. The maximum skin friction of square pile-cemented soil interface decreased with the increase of side length of square pile. The increase of the side length of square pile (i.e. the thickness of cemented soil) made the failure mode of square pile-cemented soil interface change from progressive failure to brittle failure. The maximum skin friction of square pile-cemented soil interface increased with curing time, as the maximum skin friction increased with the increase of cemented soil strength. The stress concentration occurred at the corners of the square pile during the shear tests, which hampered the frictional capacity of square pile-cemented soil interface.
Key words: pre-bored grouted planted pile    square pile-cemented soil interface    three-dimensional interface shear test    side length of square pile    curing time
收稿日期: 2022-08-12 出版日期: 2023-07-17
CLC:  TU 473  
基金资助: 国家自然科学基金资助项目（52108350; 51978610; 52078457）；中央高校基本科研业务费资助项目（2021QNA402）
通讯作者: 周佳锦     E-mail: 22012008@zju.edu.cn;zhoujiajin@zju.edu.cn
作者简介: 任建飞（1998—），男，硕士生，从事静钻根植桩的研究. orcid.org/0000-0002-8831-7306. E-mail： 22012008@zju.edu.cn
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引用本文:

任建飞,周佳锦,龚晓南,俞建霖. 方桩-水泥土接触面摩擦特性试验研究[J]. 浙江大学学报(工学版), 2023, 57(7): 1374-1381.

Jian-fei REN,Jia-jin ZHOU,Xiao-nan GONG,Jian-lin YU. Experimental study on frictional capacity of square pile-cemented soil interface. Journal of ZheJiang University (Engineering Science), 2023, 57(7): 1374-1381.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2023.07.012    或    https://www.zjujournals.com/eng/CN/Y2023/V57/I7/1374

图 1  剪切试验的示意图
图 2  不同边长方桩的照片
图 3  方桩–水泥土接触面试样的照片
图 4  荷载-位移曲线（养护时间：3 d）
图 5  边长为36 mm的方桩剪切试验后的照片
图 6  边长为45.5 mm的方桩剪切试验后的照片
图 7  荷载-位移曲线（养护时间：7 d）
图 8  荷载-位移曲线（养护时间：14 d）
图 9  侧摩阻力-相对位移曲线（养护时间：3 d）
图 10  侧摩阻力-相对位移曲线（养护时间：7 d）
图 11  侧摩阻力-相对位移曲线（养护时间：14 d）
图 12  极限侧摩阻力-边长的关系曲线
图 13  归一化最大侧摩阻力-水泥土强度的关系
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