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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2023, Vol. 57 Issue (7): 1374-1381    DOI: 10.3785/j.issn.1008-973X.2023.07.012
    
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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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     
Received: 12 August 2022      Published: 17 July 2023
CLC:  TU 473  
Fund:  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）
Corresponding Authors: Jia-jin ZHOU     E-mail: 22012008@zju.edu.cn;zhoujiajin@zju.edu.cn
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Jian-fei REN
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Cite this article:

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.

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


方桩-水泥土接触面摩擦特性试验研究

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 
Fig.1 Schematic of pile–soil interface shear test
Fig.2 Photograph of square piles with different side length
Fig.3 Photograph of square piles-cemented soil interface specimen
Fig.4 Load-displacement curve (curing time: 3 days)
Fig.5 Photograph of 36 mm square pile after shear test
Fig.6 Photograph of 45.5 mm square pile after shear test
Fig.7 Load – displacement curve (curing time: 7 days)
Fig.8 Load-displacement curve (curing time: 14 days)
Fig.9 Skin friction-relative displacement curve (curing time: 3 days)
Fig.10 Skin friction-relative displacement curve (curing time: 7 days)
Fig.11 Skin friction-relative displacement curve (curing time: 14 days)
Fig.12 Relationship curve between maximum skin friction and side length of square pile
Fig.13 Relationship between normalized maximum skin friction and cemented soil strength
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