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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年05期

页码:

174-182

栏目:

岩土工程

出版日期:

2023-09-15

文章信息/Info

Title:

Experimental study on influence of deep foundation pit excavation and inner support adjustment on adjacent open caisson

文章编号:

1673-2049(2023)05-0174-09

作者:

邓 彬¹,张 磊²,郑鹏鹏¹,陈保国²,邹顺清¹

(1. 中国水利水电第七工程局有限公司,四川 成都 610081; 2. 中国地质大学(武汉)工程学院,湖北 武汉 430074)

Author(s):

DENG Bin¹, ZHANG Lei², ZHENG Pengpeng¹, CHEN Baoguo², ZOU Shunqing¹

(1. Sinohydro Bureau 7 Co., Ltd, Chengdu 610081, Sichuan, China; 2. Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan 430074, Hubei, China)

关键词:

深基坑;  沉井;  可调节内支撑;  受力特性;  模型试验

Keywords:

deep foundation pit;  open caisson;  adjustable inner support;  stress characteristic;  model test

分类号:

TU470

DOI:

10.19815/j.jace.2022.01034

文献标志码:

A

摘要:

为了探明基坑开挖以及内支撑伸缩调控下基坑与邻近沉井受力特性变化规律,采用室内“基坑-沉井”模型试验,研究了沉井侧壁土压力、内力、周边地表沉降、墙背土压力等变化规律。结果表明:基坑开挖过程中,墙背土压力减小,沉井侧壁水平弯矩由正转负,最大弯矩值位置随开挖深度的增大逐渐下移,周边地表沉降呈三角形分布; 内支撑伸缩调节时,当前支撑深度附近墙背土压力受到的影响最明显,调节第3道支撑时局部土压力变化率最大,调节第4道支撑时局部土压力值达到最大值; 多道支撑同时调节综合影响范围大于单支撑调节; 支撑伸缩可能造成沉井发生一定转动,对靠近基坑侧沉井侧壁土压力影响大于远离基坑一侧; 伸长内支撑可以一定程度减小基坑围护结构和邻近沉井位移,但是会导致沉井局部弯矩和土压力急剧增大,工程中应加强土压力和结构变形监测。

Abstract:

In order to investigate the variation law of the stress characteristics of the foundation pit and the adjacent open caisson under the excavation of the foundation pit and the adjustment of the inner support, indoor model tests of foundation pit-open caisson were carried out to analyze the change law of the soil pressure on the sidewall of the open caisson, the internal force, the settlement of the surrounding surface, and the lateral earth pressure on the diaphragm wall back. The results show that the lateral earth pressure on the diaphragm wall back decreases, the horizontal bending moment of the sidewall of the open caisson changes from positive to negative, the position of the maximum bending moment gradually moves down with the increase of the excavation depth, and the surrounding surface settlement is triangularly distributed during the excavation of the foundation pit. When adjusting the expansion and contraction of the inner support, the soil pressure behind the diaphragm wall near the current support depth is most obviously affected, and the change rate of the local soil pressure is highest when the third support is adjusted, and the local soil pressure value reaches the maximum when the fourth support is adjusted. The combined effect of simultaneous adjustment of multiple supports is greater than that of single support adjustment. Inner support adjustment may cause the open caisson to rotate to a certain extent, and the effect on soil pressure at the sidewall of the open caisson near the foundation pit is greater than that on the opposite side. The extension of the inner support can reduce the displacement of the foundation pit enclosure and the adjacent open caisson to a certain extent, but it will lead to a sharp increase in the local bending moment and earth pressure of the open caisson, so the field monitoring of earth pressure and structural deformation should be increased in the project.

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相似文献/References:

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　SUN Chao,GUO Hao-tian.Present Situation and Prospect of New Technology for Deep Foundation Pit Support[J].Journal of Architecture and Civil Engineering,2018,35(05):104.
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备注/Memo

备注/Memo:

收稿日期:2022-01-11
基金项目:国家自然科学基金项目(52178370); 中国电建集团铁路建设有限公司科技项目[ZJSP-KY-001(YN)]
作者简介:邓 彬(1982-),男,工程师,E-mail:34003113@qq.com。

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更新日期/Last Update: 2023-09-01