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

卷:

36卷

期数:

2019年06期

页码:

95-103

栏目:

出版日期:

2019-11-25

文章信息/Info

Title:

Deformation Characteristics of Underwater Excavation of Deep Foundation Pit and Optimization of Sub-warehouse at Foundation Pit Bottom

文章编号:

1673-2049(2019)06-0095-09

作者:

李 博¹,王贵和¹,吕高峰²,王运超³

(1. 中国地质大学(北京)工程技术学院,北京 100083; 2. 北京市轨道交通建设管理有限公司,北京 100068; 3. 河南省建筑设计研究院有限公司,河南 郑州 450014)

Author(s):

LI Bo¹, WANG Gui-he¹, LYU Gao-feng², WANG Yun-chao³

(1. School of Engineering and Technology, China University of Geosciences(Beijing), Beijing 100083, China; 2. Beijing Metro Construction Administration Corporation Ltd., Beijing 100068, China; 3. The Architectural Design and Research Institute of Henan Province Co., Ltd., Zhengzhou 450014, Henan, China)

关键词:

深基坑;  水下开挖;  数值模拟;  墙体变形;  分仓墙;  布置形式

Keywords:

deep foundation pit;  underwater excavation;  numerical simulation;  wall deformation;  sub-warehouse wall;  layout form

分类号:

TU470

DOI:

-

文献标志码:

A

摘要:

依托北京地铁8号线永定门外站深基坑工程,介绍了适用于水位高、厚度大、透水性强的富水砂卵石地层深基坑水下开挖工法。采用数值模拟方法构建基坑水下开挖数值模型,结合实测数据对模型进行了验证,并利用该模型分析了深基坑水下开挖过程中坑外地表沉降、墙体水平位移变形的特性。结果表明:对于富水砂卵石地层的基坑工程,采用水下开挖及坑底分仓工艺能够较好地控制基坑变形; 坑外地表沉降主要发生在干开挖及疏干开挖阶段,水下开挖阶段引起的地表沉降量只占总变形量的7%左右; 分仓墙的设置可有效限制坑底隆起及基坑中下部变形; 墙体变形在上部支撑及下部分仓墙作用下呈“弓”字形分布,墙体变形大多发生在干开挖及疏干开挖阶段,水下开挖引起的墙体变形只占总变形量的10%左右; 分仓数量及仓位布置形式影响墙体中下部变形,仓位增加至一定数量(20仓)后可明显控制墙体变形; 在满足抗浮要求的情况下,仓位可减少至12仓; 分仓数量一定的情况下,横向布置较纵向布置形式更有利于控制墙体变形。

Abstract:

Based on the deep foundation pit project of Yongding Gate Outside Station of Beijing Metro Line 8, the underwater excavation method of deep foundation pit in water-rich sandy pebble stratum with high water level, large thickness and strong permeability was introduced. By means of numerical simulation, the numerical model of underwater excavation of deep foundation pit was constructed. The model was validated by the measured data. Based on the model, the characteristics of surface settlement outside the pit, horizontal displacement and deformation of the wall in the process of underwater excavation of deep foundation pit were analyzed. The results show that for foundation pit engineering in water-rich sandy cobble stratum, the underwater excavation and sub-warehouse technology at the bottom of pit can effectively control the deformation of foundation pit. The surface settlement outside the pit mainly occurs in the stage of dry excavation and dredging excavation, and the surface settlement caused by underwater excavation only accounts for about 7% of the total deformation. The setting of sub-warehouse wall can effectively limit the uplift of the bottom of pit and the deformation of the middle and lower part of the foundation pit. The wall deformation is bow-shaped under the action of the upper support and the lower part of the sub-warehouse wall. Most of the wall deformation occurs in the stage of dry excavation and dredging excavation. The wall deformation caused by underwater excavation only accounts for about 10% of the total deformation. The number of warehouses and the layout of warehouses affect the deformation of the middle and lower part of the wall. When the number of warehouse increases to a certain number(20 warehouses), the wall deformation can be controlled obviously. The warehouse can be reduced to 12 warehouses when the requirements of anti-floating are satisfied. When the number of warehouses is fixed, the transverse layout is more advantageous to control the wall deformation than the longitudinal layout.

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备注/Memo

备注/Memo:

收稿日期:2018-12-09
基金项目:住房和城乡建设部科学技术计划项目(2016-K4-056)
作者简介:李 博(1990-),男,河北张家口人,工学博士研究生,E-mail:357428609@qq.com。

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更新日期/Last Update: 2019-11-26