地下连续墙桩组合地基在垂直和水平荷载作用下的承载性能

IF 0.9 4区 工程技术 Q3 ENGINEERING, MULTIDISCIPLINARY Journal of Engineering Research Pub Date : 2024-09-01 DOI:10.1016/j.jer.2023.09.003
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引用次数: 0

摘要

随着地基基础工程的发展,寻找具有更高承载力和稳定性的新型地基已成为一个重要的研究方向。本文利用地下连续墙和桩基础的优点,提出了一种由地下连续墙和桩群组成的新型组合地基。本文使用有限元软件建立了地下连续墙高度从 1 米到 4 米不等的组合地基模型,并进行了模型试验以验证有限元结果的可靠性。随后,研究了四种不同高度组合的组合地基在垂直荷载作用下的沉降、轴力和水平轴力分布。与桩基础相比,组合地基能显著提高地基的极限承载力。在两个结构的连接处,桩和地下连续墙的轴力都会突然减小。地下连续墙可承受更大的垂直荷载,在桩群之间 1 米高的地下连续墙上会产生拉力,而在更高处则会产生压缩力。此外,通过分析组合地基的水平位移、桩和地下连续墙的弯矩以及地下连续墙的水平轴力,研究了组合地基的水平承载力。组合地基的水平承载力比桩基高出 26%。1 米高的地下连续墙为桩顶提供了约束,减少了水平位移。随着地下连续墙高度的增加,约束作用减弱,4 米高处的水平承载力主要依靠桩身下部。
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Bearing performance of diaphragm wall pile combination foundation under vertical and horizontal loads
With the development of foundation engineering, finding new types of foundations with higher bearing capacity and stability has become an important research direction. In this paper, a new type of combined foundation consisting of diaphragm walls and pile groups is proposed, taking advantage of the benefits of both diaphragm walls and pile foundations. Finite element software is used to establish combined foundation models with diaphragm walls ranging from 1 m to 4 m in height, and model tests are conducted to validate the reliability of the finite element results. Subsequently, the settlement, axial force, and distribution of the horizontal axial force of the combined foundations under vertical loading are investigated for four different height combinations. Compared to pile foundations, combined foundations can significantly improve the ultimate bearing capacity of the foundation. The axial forces in both the piles and diaphragm walls decrease abruptly at the connection between the two structures. The diaphragm walls can bear larger vertical loads, and a tensile force is generated in the 1 m high diaphragm wall between the pile groups, while compressive forces are generated at higher heights. Additionally, the horizontal bearing capacity of the combined foundation is examined by analyzing its horizontal displacement, bending moment of the piles and diaphragm walls, and horizontal axial force of the diaphragm walls. The horizontal bearing capacity of the combined foundation is 26% higher than that of the pile foundation. The 1 m high diaphragm wall provides constraint to the pile top, reducing the horizontal displacement. As the height of the diaphragm wall increases, the constraint effect weakens, and the horizontal bearing capacity at a height of 4 m mainly relies on the lower part of the pile body.
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来源期刊
Journal of Engineering Research
Journal of Engineering Research ENGINEERING, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
10.00%
发文量
181
审稿时长
20 weeks
期刊介绍: Journal of Engineering Research (JER) is a international, peer reviewed journal which publishes full length original research papers, reviews, case studies related to all areas of Engineering such as: Civil, Mechanical, Industrial, Electrical, Computer, Chemical, Petroleum, Aerospace, Architectural, Biomedical, Coastal, Environmental, Marine & Ocean, Metallurgical & Materials, software, Surveying, Systems and Manufacturing Engineering. In particular, JER focuses on innovative approaches and methods that contribute to solving the environmental and manufacturing problems, which exist primarily in the Arabian Gulf region and the Middle East countries. Kuwait University used to publish the Journal "Kuwait Journal of Science and Engineering" (ISSN: 1024-8684), which included Science and Engineering articles since 1974. In 2011 the decision was taken to split KJSE into two independent Journals - "Journal of Engineering Research "(JER) and "Kuwait Journal of Science" (KJS).
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