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岩溶洞穴上桩基的竖向承载性能研究。

Study on the vertical bearing performances of piles on karst cave.

机构信息

School of Architecture and Civil Engineering, Xihua University, Chengdu, 610039, China.

School of Highway, Chang'an University, Xi'an, 710064, China.

出版信息

Sci Rep. 2023 Mar 27;13(1):4944. doi: 10.1038/s41598-023-31458-2.

DOI:10.1038/s41598-023-31458-2
PMID:36973357
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10042825/
Abstract

Caves affected the load transfer mechanism of bridge pile foundation, and then the safety of the bridge was threatened. This study was to investigate the effect of karst cave under bridge pile foundations on the vertical bearing characteristics of bridge pile foundations by static load test, finite element analysis and mechanical model. The settlement of the pile was measured by displacement meter, and the axial force were measured by stress gauges in the test. The load-settlement, the axial force, the unit skin friction and the ratios of side and tip resistances were compared with the result of the simulation. Then sixteen conditions were selected in finite element analysis, one of them was a conventional pile not on cave. The others were about five kinds of height, five kinds of span and six kinds roof's thickness of the cave. The simply supported and fixed wide beam were established to calculate the allowance roof thickness. The results reveal that when the cave span is greater than 9 m × 9 m or the roof thickness is less than 2 D (pile diameter), the stress and deformation of piles are significantly affected.

摘要

溶洞会影响桥梁桩基的荷载传递机制，从而威胁到桥梁的安全。本研究通过静载试验、有限元分析和力学模型，研究了溶洞对桥梁桩基竖向承载特性的影响。通过位移计测量桩的沉降，通过应变计测量试验中的轴向力。将荷载-沉降、轴向力、单位侧摩阻力和侧阻与端阻的比值与模拟结果进行比较。然后在有限元分析中选择了十六种情况，其中一种是常规桩，不在溶洞上。其余的是关于溶洞的五种高度、五种跨度和六种顶板厚度。建立了简支和固定宽梁来计算允许的顶板厚度。结果表明，当溶洞跨度大于 9m×9m 或顶板厚度小于 2D（桩径）时，桩的应力和变形会受到显著影响。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/8af4fa12562e/41598_2023_31458_Fig16_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/8af4fa12562e/41598_2023_31458_Fig16_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/afed21b6b864/41598_2023_31458_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/525fdb94881d/41598_2023_31458_Fig5_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/5f92f1bca2aa/41598_2023_31458_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/196bd0227549/41598_2023_31458_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/f1531bd259bf/41598_2023_31458_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/0d754f989df1/41598_2023_31458_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/16c026fb0972/41598_2023_31458_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/8a5bf193e7c6/41598_2023_31458_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/086d96c63156/41598_2023_31458_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/4214b89e6eea/41598_2023_31458_Fig14_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/5d1991f610df/41598_2023_31458_Fig15_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7aff/10042825/8af4fa12562e/41598_2023_31458_Fig16_HTML.jpg

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引用本文的文献

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本文引用的文献

1
Study on the vertical bearing performance of pile across cave and sensitivity of three parameters.跨孔桩竖向承载性能及三参数敏感性研究
Sci Rep. 2021 Aug 30;11(1):17342. doi: 10.1038/s41598-021-96883-7.