可回收自平衡法检测装置研发及力学特性分析

董建华; 杨博; 田文通; 苏世林; 连博; 李建军

doi:10.11779/CJGE2023S10002

可回收自平衡法检测装置研发及力学特性分析 English Version

董建华^{1, 2,},
杨博^{1, 2},
田文通^{1, 2, 3},
苏世林^{1, 2},
连博^{1, 2},
李建军⁴

1.
兰州理工大学甘肃省土木工程防灾减灾重点实验室，甘肃兰州 730050
2.
兰州理工大学西部土木工程防灾减灾教育部工程研究中心，甘肃兰州 730050
3.
中国地震局兰州地震研究所中国地震局（甘肃省）黄土地震工程重点实验室，甘肃兰州 730000
4.
中交一公局集团有限公司，北京 100024

基金项目:

国家自然科学基金项目 52178335

中央引导地方科技发展资金项目 YDZX20216200001739

甘肃省基础研究创新群体项目 20JR10RA205

陇原青年创新创业人才（团队项目） 2020RCXM120

甘肃省优秀博士生项目 22JR5RA237

甘肃省优秀博士生项目 22JR5RA243

甘肃省教育厅优秀研究生“创新之星”项目 2022CXZX-453

甘肃省教育厅优秀研究生“创新之星”项目 2022CXZX-447

详细信息

作者简介:
董建华(1980—)，男，博士，教授，主要从事柔性边坡支挡结构静动力分析设计与岩土工程方面的研究工作。E-mail: djhua512@163.com

中图分类号: TU473.1
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- 文章访问数: 115
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出版历程
- 收稿日期: 2023-07-04
- 网络出版日期: 2023-11-23
- 刊出日期: 2023-10-31

Development and mechanical characteristics of a recyclable self-balancing detection device

DONG Jianhua^{1, 2,},
YANG Bo^{1, 2},
TIAN Wentong^{1, 2, 3},
SU Shilin^{1, 2},
LIAN Bo^{1, 2},
LI Jianjun⁴

1.
Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China
2.
Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China
3.
Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China
4.
China Communications First Highway Engineering Group Co., Ltd., Beijing 100024, China

摘要

摘要: 针对传统桩基静载试验中存在的主要问题，研发了一种可回收自平衡法桩基承载力检测装置，建立了新型可回收检测结构作用下的试桩荷载传递模型，推导出层状地基中桩身的荷载传递矩阵，并通过实际工程三维有限元计算结果，验证了理论解析方法的可靠性。结合现场实测获取的荷载-位移、桩身轴力等数据，探究了该结构的工作机理。结果表明：①该新型结构装配化程度高，测试周期短，能耗低，试验空间要求小，具备推广价值。②理论解析模型得出的桩身轴力、荷载位移曲线与实测结果吻合较好，均在误差允许范围内。③相对于传统荷载箱测试结构，该新型结构测得承载力精度提高3.5%。因此，该理论模型与新型结构在实际工程中具备很大的适用性与推广价值。
- 桩基础 /
- 自平衡法 /
- 层状地基 /
- 荷载传递模型
Abstract: Aiming at the main problems existing in the static load tests on pile foundations, a recyclable self-balancing detection device for the bearing capacity of the pile foundations is developed. The load transfer model for the test piles under the action of a new recyclable detection structure is established, and the load transfer matrix of pile body in a layered foundation is derived. The reliability of theoretical analysis is verified by the results of three-dimensional finite element calculation in practical engineering. The working mechanism of the structure is studied based on the data of load-displacement and pile axial force obtained from the field measurements. The results show that: (1) The new structure has high assembly degree, short test period, low energy consumption and small test space requirements, and is worth popularizing. (2) The axial load-displacement curves of the pile obtained from the theoretical analytical model are in agreement with the measured results, both of which are within the allowable error range compared with those of the load box test structure. (3) The accuracy of the bearing capacity measured by the new structure is improved by 3.5%. Therefore, the theoretical model and the new structure are of great applicability and popularization value in practical engineering.
- pile foundation /
- self-balancing method /
- layered foundation /
- load transfer model

HTML全文

图 1 新型检测结构

Figure 1. New detection structure

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图 2 荷载传递模型

Figure 2. Load transfer model

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图 3 数值分析模型

Figure 3. Numerical model

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图 4 试桩Q-S曲线

Figure 4. Q-S curves of test piles

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图 5 各级加载下试桩轴力分布

Figure 5. Distribution of axial force of test piles under different loads

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图 6 试桩等效荷载曲线

Figure 6. Equivalent load curves of test piles

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