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[1] ZHANG Runze, WANG Hongtao, WANG Lei, GONG Weiming, et al. Experimental study on the pile-tip resistance bearing characteristics of postgrouting at pile tip [J]. Journal of Southeast University (English Edition), 2025, 41 (3): 295-304. [doi:10.3969/j.issn.1003-7985.2025.03.005]
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Experimental study on the pile-tip resistance bearing characteristics of postgrouting at pile tip()
桩端压浆对桩端阻力承载性状的试验研究
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
41
Issue:
2025 3
Page:
295-304
Research Field:
Civil Engineering
Publishing date:
2025-09-11

Info

Title:
Experimental study on the pile-tip resistance bearing characteristics of postgrouting at pile tip
桩端压浆对桩端阻力承载性状的试验研究
Author(s):
ZHANG Runze1,4, WANG Hongtao2, WANG Lei3, GONG Weiming1, WAN Zhihui1,2
1.School of Civil Engineering, Southeast University, Nanjing 211189, China
2.College of Transportation Engineering, Nanjing Tech University, Nanjing 211816, China
3.Nanjing Dongtu Construction Technology Co., Ltd., Nanjing 211164, China
4.Railway Fifth Survey and Design Institute Group Co., Ltd., Beijing 102600, China
张润泽1,4, 王宏涛2, 王磊3, 龚维明1, 万志辉1,2
1.东南大学土木工程学院， 南京 211189
2.南京工业大学交通运输工程学院， 南京 211816
3.南京东土建设科技 有限公司， 南京 211164
4.中铁第五勘察设计院集团有限公司，北京 102600
Keywords:
postgrouting at pile tip;  pile-tip resistance;  pile-side resistance;  negative skin friction;  enhancement effect;  precompression effect
桩端压浆; 桩端阻力; 桩侧摩阻力; 负摩阻力; 增强效应; 预压作用
PACS:
TU473.1
DOI:
10.3969/j.issn.1003-7985.2025.03.005
Abstract:
Postgrouting at the pile tip enhances the performance of cast-in-place piles. To clarify the performance of tip and side resistances, this study analyzed static load test data from two test piles before and after grouting. Mechanisms underlying an improvement in tip resistance and the influence of postgrouting on side resistance were investigated via theoretical analysis. Finally, a design method for tip resistance control via settlement was proposed. Results indicate that the ultimate bearing capacity of piles increases after grouting compared to before, underscoring the importance of tip grouting in gravelly soils and its profound impact on load transmission in pile foundations. Postgrouting at the pile tip enhances the strength as well as initial stiffness of the bearing stratum, ultimately elevating the overall pile foundation-bearing capacity. Additionally, tip grouting helps in strengthening overall side resistance, especially around the pile tip. The grouting procedure has an impact on the soil’s arching effect at the pile tip; the extent of the arching effect and an increase in horizontal tension close to the pile tip are positively correlated with the effectiveness of grouting reinforcement. The design method for tip resistance control via settlement based on measured data statistics was validated using engineering examples, and the method has a practical reference value.
桩端后压浆可以有效改善灌注桩的承载性能。为了研究桩端后压浆桩端阻力和侧阻力的发挥，对压浆前后的2根试桩现场静载试验数据进行分析。通过理论分析研究了桩端阻力提高的机制以及桩端后压浆对侧阻力的作用。在此基础上，提出了一种以沉降控制桩端阻力的设计方法。研究结果表明，压浆后桩的极限承载力有所提高，这体现了砾石土中桩端注浆的有效性及其对桩基荷载传递能力的影响。桩端后压浆增强了持力层的强度和初始刚度，最终提高了桩基的整体承载力。此外，桩端压浆有助于增强桩身整体侧阻力，尤其是桩端附近。桩端后注浆对桩端土壤的成拱效应有影响，成拱效应的程度和桩端附近水平向应力的增加与注浆加固的有效性呈正相关。基于实测数据统计的沉降控制桩端阻力的设计方法已通过工程实例验证，具有实用参考价值。

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Memo

Memo:
Received 2024-11-26, Revised 2025-02-01.
Biographies: Zhang Runze (1984—), male, Ph.D. candidate;Wan Zhihui (corresponding author), male, doctor, associate professor, wanzhihui@njtech.edu.cn.
Foundation items:The National Natural Science Foundation of China (No. 52008100, 52178317), the Natural Science Foundation of Jiangsu Province (No. BK20200400), China Postdoctoral Science Foundation (No. 2022M723534), the Natural Science Foundation of Jiangsu Higher Education Institutions of China (No. 23KJA560005).
Citation:ZHANG Runze,WANG Hongtao,WANG Lei,et al.Experimental study on the pile-tip resistance bearing characteristics of postgrouting at pile tip[J].Journal of Southeast University (English Edition),2025,41(3):295-304.DOI:10.3969/j.issn.1003-7985.2025.03.005.DOI:10.3969/j.issn.1003-7985.2025.03.005
Last Update: 2025-09-20