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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05期

页码:

11-20

栏目:

出版日期:

2019-09-23

文章信息/Info

Title:

Influence of Excavation of Zhengzhou Silt Foundation Pit on Underlying Subway Tunnel

文章编号:

1673-2049(2019)05-0011-10

作者:

郭院成^1,2,詹景元¹,杜浩鸣³,李明宇^1,2,靳军伟^1,2,孟 潮¹

(1. 郑州大学 土木工程学院,河南 郑州 450001; 2. 郑州大学 地下工程安全与质量控制河南省工程实验室,河南 郑州 450001; 3. 河南省交通规划设计研究院股份有限公司,河南 郑州 450052)

Author(s):

GUO Yuan-cheng^1,2, ZHAN Jing-yuan¹, DU Hao-ming³, LI Ming-yu^1,2, JIN Jun-wei^1,2, MENG Chao¹

(1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China; 2. Laboratory of Underground Engineering Safety and Quality Control of Henan Province, Zhengzhou University, Zhengzhou 450001, Henan, China; 3. Henan Provincial Communications Planning & Design Institute Co., Ltd., Zhengzhou 450052, Henan, China)

关键词:

地铁隧道;  变形;  粉土;  基坑开挖;  竖向位移;  数值分析

Keywords:

subway tunnel;  deformation;  silt soil;  excavation of foundation pit;  vertical displacement;  numerical analysis

分类号:

TU473

DOI:

-

文献标志码:

A

摘要:

针对基坑开挖导致正在服役的下卧地铁隧道产生隆起变形而影响地铁运营安全的问题,以郑州东区粉土土质情况下邻近地铁的基坑工程为案例进行研究。通过室内土工试验得到了郑州粉土的相关具体力学参数取值,并建立了基坑开挖对下卧服役地铁隧道影响的三维数值分析模型,分析了基坑开挖对下卧地铁隧道的位移影响。结果表明:基坑开挖对下卧地铁隧道竖向位移的影响远大于对水平位移的影响; 郑州东区粉土土质条件下的基坑开挖对下卧隧道竖向位移的影响要远小于上海黏土土质在经历相同基坑开挖工况下产生的对隧道竖向位移的影响; 使用常规分层开挖方法进行基坑开挖引起的隧道竖向最大位移值超过了郑州地铁保护标准; 采用提出的施作抗拔桩并分块开挖及时堆载的方案能大幅度减小基坑开挖对下卧服役地铁隧道竖向上浮量的影响; 研究成果对郑州粉土地区基坑开挖条件下的下卧服役地铁隧道保护具有指导意义。

Abstract:

The excavation of foundation pit could cause the uplift deformation of underlying subway tunnel in service, which would affect the operation safety of subway. Taking the foundation pit near subway as specific engineering case under the condition of silt soil in Zhengzhou East District, the specific mechanical parameters of Zhengzhou silt were obtained through indoor geotechnical experiments, and a three-dimensional numerical analysis model for the influence of foundation pit excavation on underlying subway tunnel was established. Then the influence of foundation pit excavation on the displacement of underlying subway tunnel was analyzed. The results show that the influence of foundation pit excavation on the vertical displacement of underlying subway tunnel is much greater than the impact on horizontal displacement. Compared with the condition of Shanghai soft soil, at the same excavation conditions, the vertical displacement of underlying subway tunnel which is caused by excavation of foundation pit under the condition of Zhengzhou silt soil is much less. The vertical maximum displacement of tunnel caused by pit excavation using conventional layered excavation method exceeds the subway protection standard of Zhengzhou. The foundation pit excavation using the scheme proposed through the methods of combining construction of uplift piles, block excavation and timely loading can greatly reduce the influence on the vertical displacement of underlying subway tunnel in service. The research results have guiding significance for the protection of underlying subway tunnel under the conditions of foundation pit excavation in Zhengzhou silt district.

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备注/Memo

备注/Memo:

收稿日期:2018-12-06 基金项目:国家自然科学基金项目(51508520) 作者简介:郭院成(1965-),男,河南辉县人,教授,博士研究生导师,工学博士,E-mail:guoyuancheng@163.com。

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更新日期/Last Update: 2019-09-29