Influence of mud cake and mud penetration layer on vertical bearing capacity of bored pile

doi:10.3785/j.issn.1008-973X.2026.06.004

Journal of ZheJiang University (Engineering Science)

2026, Vol. 60

Issue (6): 1176-1184 DOI: 10.3785/j.issn.1008-973X.2026.06.004

Influence of mud cake and mud penetration layer on vertical bearing capacity of bored pile

Zhengzhen WANG1(

),Zelong YANG1,Guoliang DAI2,Tianzhong MA1,*(

),Fei GAO3,Yousheng DENG4

1. School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2. School of Civil Engineering, Southeast University, Nanjing 210096, China
3. China Railway 21st Bureau Group Limited Company, Lanzhou 730050, China
4. School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

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Abstract

The laboratory model test was conducted to analyze the influence of mud circulation time on the vertical bearing characteristic of bored pile in order to analyze the impact of mud cake and mud penetration layer on the vertical bearing characteristic of bored pile. A calculation formula for single pile settlement considering the mud cake and mud penetration layer was derived based on the principle of the shear displacement method, and the validity of the theory was verified through model test and numerical simulation. The influencing factor of mud penetration on bored pile was discussed. Results showed that the water mass fraction of the soil around the pile increased with the extension of mud circulation time. The pile top settlement, pile shaft axial force and pile end resistance of the test pile gradually increased as the mud circulation time increased under the premise of the same pile top load, while the pile shaft side friction resistance gradually decreased. The results of theoretical calculation accorded well with those of model test and numerical simulation, which confirmed the correctness of the theoretical formula. The pile top settlement and bearing capacity are negatively correlated with the plastic shear modulus of the mud cake and the mud penetration layer.

Key words： bored pile mud circulation time mud cake mud penetration layer bearing characteristic

Received: 27 June 2025 Published: 06 May 2026

CLC:

TU 473

Fund: 国家自然科学基金资助项目（52068048）；甘肃省联合科研基金资助项目（24JRRA871）；兰州理工大学红柳优秀青年人才支持计划资助项目.

Corresponding Authors: Tianzhong MA E-mail: wangzz@lut.edu.cn;matz0914@163.com

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	Yousheng DENG

Cite this article:

Zhengzhen WANG,Zelong YANG,Guoliang DAI,Tianzhong MA,Fei GAO,Yousheng DENG. Influence of mud cake and mud penetration layer on vertical bearing capacity of bored pile. Journal of ZheJiang University (Engineering Science), 2026, 60(6): 1176-1184.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2026.06.004 OR https://www.zjujournals.com/eng/Y2026/V60/I6/1176

泥皮和泥浆渗透层对灌注桩竖向承载力的影响

为了研究泥皮和泥浆渗透层对灌注桩竖向承载特性的影响，通过室内模型试验，分析泥浆循环时间对灌注桩竖向承载特性的影响. 基于剪切位移法原理，推导考虑泥皮及泥浆渗透层的单桩沉降计算公式，通过模型试验和数值模拟验证了理论的正确性. 探讨泥浆渗透灌注桩的影响因素. 结果表明，桩周土的水质量分数随着泥浆循环时间的增大而增大. 随着泥浆循环时间的增大，且在桩顶荷载相同的前提下，试桩的桩顶沉降、桩身轴力和桩端阻力会逐渐变大，但桩身侧摩阻力会逐渐减小. 理论计算结果与模型试验和数值模拟的结果比较吻合，说明了理论公式的正确性. 桩顶沉降和承载力与泥皮和泥浆渗透层的塑性切变模量呈负相关关系.

关键词： 灌注桩, 泥浆循环时间, 泥皮, 泥浆渗透层, 承载特性

Fig.1 Layout drawing of model pile and model test equipment

Fig.2 Arrangement of reinforcement cage and strain gauge

Tab.1 Performance parameter of mud

Fig.3 Mud performance test and model test equipment

Tab.2 Design parameter of model pile

Fig.4 Variation curve of moisture mass fraction of soil around pile

Fig.5 P-S curve of test pile

Fig.6 Distribution curve of average lateral friction resistance of test pile shaft

Fig.7 Shear deformation diagram of soil around pile

Fig.8 Force analysis diagram of pile

Tab.3 Material parameter of numerical simulation

Fig.9 Mesh generation for each component in numerical simulation

Fig.10 Comparison diagram of calculation result for P-S curve of slurry-supported bored pile

Fig.11 Effect of mud plastic shear modulus variation on pile top settlement

Fig.12 Effect of mud penetration layer plastic shear modulus variation on pile top settlement


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