Field test study on uplift bearing characteristics of rock socketed piles in sandstone stratum

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2025-03-12 DOI:10.1016/j.sandf.2025.101598

Yang Bai , Qin Chao , Yang Yuan-hao , Cheng Feng , Zhao Shan-shan

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Abstract

Based on the field ultimate load test, the uplift bearing characteristics of reinforced cement concrete (RCC) bored piles in clay and sandstone strata were analyzed, and semi empirical methods for calculating the ultimate uplift capacity of rock socketed pile were proposed. This method was compared with the design codes of pile foundations in China and Europe, and its reliability was verified by engineering case analysis. The results show that the relationship curves between pile top displacement and uplift load are of steep deformation type. In the field test, the ultimate uplift capacity increases with the increase of rock socketed depth or pile diameter. The failure mode of uplift pile is the relative sliding failure of pile body and surrounding rock and soil. In this technical report, the relationship between ultimate side resistance

f_{r}

and unconfined compressive strength

σ_{c}

of sandstone is proposed,

f_{r} = 0.18 σ_{c}^{0.5}

(MPa). And the calculation method of ultimate uplift capacity of the pile in clay and sandstone strata is proposed. The calculated results are in good agreement with the test results, with an error of −11.4 % to 9.5 %, which is smaller than that of the design codes of pile foundations in China and Europe. This calculated method has a certain reference for the design of uplift piles in similar strata.

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砂岩地层中嵌岩桩抗拔承载特性的现场试验研究

在现场极限荷载试验的基础上，分析了粘土和砂岩地层中钢筋水泥混凝土钻孔灌注桩的抗拔承载力特性，提出了嵌岩桩抗拔承载力的半经验计算方法。将该方法与中国和欧洲桩基设计规范进行了比较，并通过工程实例分析验证了该方法的可靠性。结果表明：桩顶位移与拔荷载的关系曲线为陡变形型；在现场试验中，随着嵌岩深度和桩径的增加，抗拔能力逐渐增大。拔桩的破坏模式为桩身与围岩的相对滑动破坏。提出了砂岩极限侧阻力fr与无侧限抗压强度σc的关系，fr=0.18σc0.5 （MPa）。提出了粘土和砂岩地层中桩的极限抗拔能力的计算方法。计算结果与试验结果吻合较好，误差在- 11.4% ~ 9.5%之间，小于中国和欧洲桩基设计规范。该计算方法对类似地层中抗拔桩的设计具有一定的参考意义。

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.