某超深圆形基坑受力变形的尺寸效应分析
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1.华东交通大学江西省岩土工程基础设施安全与控制重点实验室;2.中铁上海设计院集团有限公司;3.南昌轨道交通集团有限公司

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TU94

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Analysis of the size effect of a super-deep circular foundation pit under stress and deformation
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    摘要:

    以佛山市某超深工作井基坑为依托,采用数值模拟方法,分析不同基坑尺寸对地下连续墙水平位移、弯矩、墙后地表沉降、坑底隆起的影响,并通过现场监测结果验证了数值分析的可靠度。基于此,进一步研究了尺寸效应对圆形基坑拱效应特点的影响。研究表明:地下连续墙水平位移、弯矩、墙后地表沉降、坑底隆起均表现随基坑尺寸增大而增大的整体趋势,当基坑直径小于65.9m时,对各参数影响较大,反之较小。且当基坑直径约为0.6~0.9倍基坑开挖深度时,围护结构环向应力大于径向应力,具有较好的“拱效应”;当基坑直径超出该范围,环向应力小于径向应力,“拱效应”减弱。通过对某超深圆形基坑尺寸的研究,以期为相关工程提供参考。

    Abstract:

    Relying on the foundation pit of an ultra-deep working well in Foshan City, numerical simulation methods are used to analyze the influence of different foundation pit sizes on the horizontal displacement, bending moment, surface settlement behind the wall, and pit bottom uplift of the diaphragm wall, and the on-site monitoring results verify the reliability of numerical analysis is improved. Based on this, the influence of the size effect on the arch effect characteristics of the circular foundation pit is further studied. The research shows that the horizontal displacement, bending moment, surface settlement behind the wall, and pit bottom uplift of the diaphragm wall show an overall trend of increasing with the increase of the size of the foundation pit. When the diameter of the foundation pit is less than 65.9m, it has a greater impact on various parameters. And when the diameter of the foundation pit is about 0.6~0.9 times of the excavation depth of the foundation pit, the circumferential stress of the retaining structure is greater than the radial stress, which has a good "arch effect"; when the diameter of the foundation pit exceeds in this range, the hoop stress is smaller than the radial stress, and the "arch effect" is weakened. Through the study of the size of an ultra-deep circular foundation pit, it is expected to provide reference for related projects.

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  • 收稿日期:2021-05-15
  • 最后修改日期:2021-05-28
  • 录用日期:2021-05-31
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