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

卷:

39卷

期数:

2022年05期

页码:

251-261

栏目:

基础工程

出版日期:

2022-09-30

文章信息/Info

Title:

Study on Construction Mechanical Behavior of Ultra-deep Diaphragm Wall in Gravel Stratum Based on Discrete-continuous Coupling Method

文章编号:

1673-2049(2022)05-0251-11

作者:

申玉生¹,甘雨航¹,资晓鱼²,董 俊³,闵 鹏¹,张逸飞¹,王 进⁴

(1. 西南交通大学 交通隧道工程教育部重点实验室,四川 成都 610031; 2. 中国科学院光电技术研究所,四川 成都 610209; 3. 中铁第四勘察设计院集团有限公司,湖北 武汉 430063; 4. 中国中铁四局集团城市轨道交通工程分公司,安徽 合肥 230022)

Author(s):

SHEN Yu-sheng¹, GAN Yu-hang¹, ZI Xiao-yu², DONG Jun³, MIN Peng¹, ZHANG Yi-fei¹, WANG Jin⁴

(1. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, Sichuan, China; 3. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 4. Urban Rail Transit Engineering Branch Co., Ltd. of CTCE Group, Hefei 230022, Anhui, China)

关键词:

地铁工程;  施工力学行为;  离散-连续耦合方法;  地下连续墙;  圆砾地层

Keywords:

subway engineering;  construction mechanical behavior;  discrete-continuous coupling method;  diaphragm wall;  gravel stratum

分类号:

TU753

DOI:

10.19815/j.jace.2021.04093

文献标志码:

A

摘要:

依托昆明轨道交通4号线火车北站工程(三线换乘站),推导了离散元-有限差分耦合算法,并对圆砾地层中单幅超深(70 m)地下连续墙施工全过程的力学行为展开研究。结果表明:超深地下连续墙成槽施工阶段地层水平应力与竖向应力不同程度下降,槽壁向槽内卸荷变形,黏性土层在槽段拐角附近有土拱形成,区域内应力增加,圆砾地层土拱效应不明显; 成槽阶段槽壁累计水平变形由大到小依次为圆砾地层、下伏地层、上覆土体,水平最大位移约为15.8 mm,最大地表沉降约为9 mm; 在混凝土浇筑阶段,地层应力在混凝土压力挤压作用下均出现不同程度增长,槽壁向槽外反向内挤变形,地表向上隆起变形,并在混凝土硬化阶段逐渐收敛; 研究成果应用于实际工程取得了良好成槽效果,可为同类地下连续墙设计施工提供一定参考。

Abstract:

Based on the Kunming Rail Transit Line 4 north railway station engineering(three-line transfer), the coupling algorithm of discrete element method(DEM)and finite difference method(FDM)was derived, and the mechanical behavior of the whole construction process of a single ultra-deep(70 m)diaphragm wall in gravel stratum was studied. The results show that the horizontal and vertical stresses of the stratum decrease in different degrees during the groove formation stage of ultra deep diaphragm wall, and the groove wall is unloaded and deforms into the groove. In the cohesive soil layer, soil arch is formed near the corners of the trough section, the stress in the area increases, and the soil arching effect of the gravel stratum is not obvious. The cumulative horizontal deformation of the groove wall during the groove formation stage from large to small is gravel stratum, underlying stratum and overlying soil. The maximum horizontal displacement is about 15.8 mm and the maximum ground settlement is about 9 mm. During the concrete pouring stage, the stratum stress rises to various degrees under the action of the concrete pressure squeezing. The groove wall squeezes and deforms toward outside, the ground uplifts and deforms, and gradually converge in the concrete hardening stage.The research results have been applied to the actual engineering and achieved good groove formation effect, which can provide certain reference for the design and construction of similar diaphragm walls.

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备注/Memo

备注/Memo:

收稿日期:2021-04-21
基金项目:国家重点研发计划项目(2019YFC0605104); 国家自然科学基金项目(51778540)
作者简介:申玉生(1976-),男,山东临朐人,教授,博士研究生导师,工学博士,E-mail:sys1997@163.com。

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更新日期/Last Update: 2022-09-30