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

卷:

42卷

期数:

2025年01期

页码:

179-190

栏目:

岩土工程

出版日期:

2025-01-20

文章信息/Info

Title:

Research on influence of different bottom reinforcement forms on deformation of pipe gallery excavation

文章编号:

1673-2049(2025)01-0179-12

作者:

宋许根^1,2,甄 洁²,朱孟君¹,王志勇¹,衣 凡²,雷华阳²,郑 刚²,程雪松²

(1. 中铁第四勘察设计院集团有限公司,湖北 武汉 430063; 2. 天津大学 土木工程系,天津 300072)

Author(s):

SONG Xugen^1,2, ZHEN Jie², ZHU Mengjun¹, WANG Zhiyong¹, YI Fan², LEI Huayang², ZHENG Gang², CHENG Xuesong²

(1. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 2. Department of Civil Engineering, Tianjin University, Tianjin 300072, China)

关键词:

软土区;  管廊基坑;  有限元模拟;  坑底加固形式;  基坑变形

Keywords:

soft soil area;  pipe gallery excavation;  finite element simulation;  bottom reinforcement form;  excavation deformation

分类号:

TU433

DOI:

10.19815/j.jace.2022.09033

文献标志码:

A

摘要:

基于PLAXIS 3D有限元软件,针对广州南沙某管廊基坑工程,系统分析了抽条加固、格栅状加固、裙边加固与满堂加固的面积置换率、加固宽度d、加固深度h等加固参数对基坑变形(围护结构侧移、地表沉降和坑底隆起)的影响,得到了加固参数的限值。结果表明:不同加固形式和加固参数对基坑变形的控制效果不同; 4种加固方式均存在加固深度限值,抽条加固的加固深度限值为0.8H(H为基坑开挖深度),格栅状加固与满堂加固控制围护结构变形与地表沉降的加固深度限值为0.6H,控制坑底隆起的加固深度限值为0.8H,裙边加固深度大于0.6H时,控制效果显著; 抽条加固、裙边加固不存在加固宽度限值,抽条加固宽度对基坑变形无影响,裙边加固增大加固宽度,对围护结构侧移与地表沉降的控制效果呈线性增加,加固宽度大于0.39B(B为基坑宽度)后对坑底隆起的控制效果显著,但裙边加固会使坑底中央隆起凸出,且加固宽度一般不超过0.3B,因此不建议在软土基坑工程中使用裙边加固; 抽条加固、格栅状加固存在加固面积置换率限值,抽条加固控制基坑各项变形的面积置换率限值为66.67%,格栅状加固纵向面积置换率为64.29%时,中轴线存在加固区,隆起曲线呈“M”形,加固效果较好; 加固面积相同时,加固效果从大到小依次为抽条加固、格栅状加固、裙边加固,加固体积相同时,加固效果从大到小依次为满堂加固、抽条加固、格栅状加固。

Abstract:

Based on PLAXIS 3D finite element software, aiming at a pipe gallery excavation project in Nansha, Guangzhou, the influence of reinforcement parameters such as area replacement rate, reinforcement width d and reinforcement depth h of strip reinforcement, grid reinforcement, skirt reinforcement and full house reinforcement on the deformation of foundation pit(lateral displacement of retaining structure, surface settlement and basal heave)was systematically analyzed, and the limit values of reinforcement parameters were obtained. The results show that different reinforcement forms and reinforcement parameters have different control effects on excavation deformation. There are reinforcement depth limits in the four reinforcement forms. The reinforcement depth limit of strip reinforcement is 0.8H(H is excavation depth). The reinforcement depth limit of grid reinforcement and full house reinforcement to control the deformation of retaining structure and surface settlement is 0.6H, the reinforcement depth limit to control the basal heave of excavation is 0.8H, and the control effect is remarkable when the reinforcement depth of skirt reinforcement is greater than 0.6H. There is no reinforcement width limit for strip reinforcement and skirt reinforcement. The width of the strip reinforcement has no effect on the deformation of the excavation. Increasing the width of the skirt reinforcement, the control effect of the lateral displacement of the retaining structure and the surface settlement increases linearly. When the reinforcement width is greater than 0.39B(B is excavation width), the control effect of the basal heave is significant. However, the skirt reinforcement will make the central heave of the bottom bulge, and the reinforcement width generally does not exceed 0.3B.Therefore, it is not recommended to use the skirt reinforcement in the soft soil excavation project. There is a limit value of reinforcement area replacement rate for strip reinforcement and grid reinforcement. The area replacement rate limit of strip reinforcement to control the various deformation is 66.67%. When the longitudinal area replacement rate of grid reinforcement is 64.29%, there is a reinforcement area in the central axis, and the shape of the basal heave curve is “M” type, and the reinforcement effect is better. When the reinforcement area is the same, the reinforcement effect from large to small is strip reinforcement, grid reinforcement and skirt reinforcement. When the reinforcement volume is the same, the reinforcement effect from large to small is full reinforcement, strip reinforcement and grid reinforcement.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2023-09-05
基金项目:国家自然科学基金项目(52178343); 中铁第四勘察设计院集团有限公司重点科研课题(2020k118); 住房和城乡建设部支撑产业转型升级重点研发项目(2020k155)
作者简介:宋许根(1992-),男,工程师,E-mail:songxugen@qq.com。
通信作者:程雪松(1985-),男,工学博士,教授,博士生导师,E-mail:cheng_xuesong@163.com。Author resumes: SONG Xugen(1992-), male, engineer, E-mail: songxugen@qq.com; CHENG Xuesong(1985-), male, PhD, professor, E-mail: cheng_xuesong@163.com.

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更新日期/Last Update: 2025-01-20