Test technology of large-diameter pile foundation of reaction device of underground composite structure

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Apr.2025, Vol.48 No.4: 549-554

DOI: 10.3969/j.issn.1003-5060.2025.04.019

Authors

YIN Yonggao $ ^{1,2} $, ZHENG Shiwen $ ^{3} $, LI Mengchen $ ^{1} $, ZHENG Xin $ ^{1} $, XI Banglu $ ^{1} $

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Anhui Transportation Holding Group Co., Ltd., Hefei 230088, China; 3. Anhui Expressway Engineering Test and Research Center Co., Ltd., Hefei 230061, China)

Abstract and Keywords

Abstract: A new pile foundation detection technology is proposed based on the principle of self-balancing combined with the static load detection technology. The finite difference software FLAC3D was used to simulate the reaction device in order to analyze the bearing characteristics of the reaction device and the uplift bearing characteristics of root-caisson. The results show that the reaction device of the underground composite structure realizes the bearing capacity detection of large-diameter piles by static load test, which improves and effectively ensures the accuracy of large-diameter pile bearing capacity detection. Stacking concentrated surface areas have greater safety and convenience. Increasing the root bond arrangement has a significant effect on improving the uplift bearing capacity of the caisson, and the use of root-caisson as a reaction device to provide bearing capacity is superior. The ultimate uplift bearing capacity of root-caisson in the pressurized state is greater than the sum of the ultimate bearing capacity of the root-caisson and the applied load in the non-pressurized state, which has a good effect and greatly plays the role of the surrounding soil.

Keywords: pile foundation detection; self-balancing; numerical analysis; ultimate bearing capacity calculation

作者信息

殷永高 $ ^{1,2} $，郑诗文 $ ^{3} $，李梦晨 $ ^{1} $，郑鑫 $ ^{1} $，奚邦禄 $ ^{1} $

（1. 合肥工业大学土木与水利工程学院，安徽合肥 230009；2. 安徽省交通控股集团有限公司，安徽合肥 230088；3. 安徽省高速公路试验检测科研中心有限公司，安徽合肥 230061）

摘要和关键词

摘要: 文章利用自平衡原理,结合静载检测技术提出一种新的桩基检测技术。利用有限差分软件FLAC3D对反力装置进行数值模拟,通过数值模拟探讨反力装置的承载特性,分析根式沉井抗拔承载特性。研究结果表明:地下组合结构反力装置以静载试验的方式实现了大直径桩的承载力检测,提高并有效确保大直径桩承载力检测的准确性。堆载集中地表区域,具有更高的安全性和便捷性。增加根键布置对于提升沉井抗拔承载力具有显著效果,利用根式沉井作为反力装置提供承载力具有优越性。处在受压状态下的根式沉井的极限抗拔承载力大于非受压状态下根式沉井极限承载力与所施加的荷载之和,其装置起到良好的效果,极大发挥了周围土体的作用。

关键词: 桩基检测；自平衡；数值分析；极限承载力计算

Funding

国家自然科学基金资助项目（52209127）；安徽省交通控股集团有限公司科技资助项目（JKKJ-2020-31）

合肥工业大学学报(自然科学版)

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