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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第47卷

期数:

2025年第03期

页码:

356-370

栏目:

黄河流域生态保护和高质量发展专刊(上)

出版日期:

2025-05-15

文章信息/Info

Title:

Response Law of Surrounding Rock of Metro Tunnel Concealed Excavation Crossing Ground Fissure Zone—Taking Xi'an Metro Line 6 in Shaanxi, China as an Example

文章编号:

1672-6561(2025)03-0356-15

作者:

郭哲昊¹; 黄强兵¹; 2; 3*; 苟玉轩¹; 郭治宇¹; 李晨阳⁴

(1.长安大学 地质工程与测绘学院,陕西 西安 710054; 2.自然资源部地裂缝地质灾害重点实验室,江苏 南京 210049; 3.长安大学 西部矿产资源与地质工程教育部重点实验室,陕西 西安 710054; 4.中水北方勘察设计研究有限公司,天津 300222)

Author(s):

GUO Zhe-hao¹;  HUANG Qiang-bing¹; 2; 3*;  GOU Yu-xuan¹;  GUO Zhi-yu¹;  LI Chen-yang⁴

(1.School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,Shaanxi,China; 2.Key Laboratory of Earth Fissures Geological Disaster of Ministry of Natural Resources,Nanjing 210049,Jiangsu,China; 3.Key Laboratory of Western China's Mineral Resources and Geological Engineering of Ministry of Education,Chang'an University,Xi'an 710054,Shaanxi,China; 4.China Water Resources Beifang Investigation,Design and Research Co.,Ltd.,Tianjin 300222,China)

关键词:

地铁隧道;  暗挖;  地裂缝;  模型试验;  地表沉降;  围岩;  应力;  数值模拟

Keywords:

metro tunnel;  concealed excavation;  ground fissure;  model test;  ground settlement;  surrounding rock;  stress;  numerical simulation

分类号:

P642.13⁺1; U45

DOI:

10.19814/j.jese.2024.09008

文献标志码:

A

摘要:

地裂缝是一种特殊的城市地质灾害,对西安地铁工程施工安全与长期运营构造成了威胁。为了揭示地裂缝场地地铁隧道施工围岩扰动影响规律,以西安地铁6号线穿越地裂缝带为工程背景,采用几何比例尺为1:20的物理模型试验,并结合数值模拟技术,研究了隧道穿越地裂缝带暗挖施工过程中的围岩响应特征。结果表明:地表沉降与围岩应力变化随开挖步长呈反“S”型,其发展大致分为微变形、急剧变形和稳定变形3个阶段; 施工过程中,地表沉降与围岩应力的峰值均出现在地裂缝处,且随着与地裂缝距离的增大而减小,受地裂缝影响的范围为上盘20.1 m、下盘18.6 m; 开挖方向决定了围岩应力与变形的大小,从地裂缝下盘至上盘开挖方式引起的地表沉降与围岩应力均要略小于从地裂缝上盘至下盘开挖方式; 开挖过程中围岩在地裂缝处出现应力松弛,围岩应力增加最大值可达3.05 kPa(对应原型值为61 kPa)。

Abstract:

Ground fissure is a special kind of urban geological disaster, which threatens the construction safety and long-term operation of Xi'an metro engineering. In order to reveal the disturbance effect of metro tunnel construction on surrounding rock in ground fissure site, Xi'an Metro Line 6 crossing the ground fissure zone was taken as the engineering background; through the physical model test with a geometric scale of 1:20, combined with numerical simulation, the response of surrounding rock in concealed excavation construction of metro tunnel in ground fissure site was studied. The results show that the ground settlement and the surrounding rock stress show an anti-“S” deformation law with the increase of excavation step size, which can be roughly divided into three stages, including small deformation, rapid deformation, and stable deformation; during the construction process, the peak values of ground settlement and surrounding rock stress both occur at the ground fissures, and the ground settlement and surrounding rock stress decrease with increasing distance from the ground fissures; the range affected by the ground fissures is 20.1 m in the hanging wall and 18.6 m in the footwall; the excavation direction determines the magnitude of stress and deformation in the surrounding rock, and the ground settlement and surrounding rock stress caused by the excavation from the footwall to the hanging wall of the ground fissure are slightly smaller than those caused by the excavation from the hanging wall to the footwall of the ground fissure; during the excavation process, the stress relaxation phenomenon of the surrounding rock of the tunnel appears at the ground fissure zone, the maximum increase of surrounding rock stress can reach 3.05 kPa(the corresponding prototype value is 61 kPa).

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相似文献/References:

[1]门玉明,张结红,刘洪佳,等.西安地铁隧道穿越地裂缝带的计算模型探讨[J].地球科学与环境学报,2011,33(01):95.
　MEN Yu-ming,ZHANG Jie-hong,LIU Hong-jia,et al.Discussion on the Computing Model for Xi'an Metro Tunnel Passing Through the Ground Fissure Zone[J].Journal of Earth Sciences and Environment,2011,33(03):95.
[2]黄强兵,彭 博,苟玉轩,等.西安地铁盾构隧道穿越地裂缝带的适应性与应对措施[J].地球科学与环境学报,2023,45(03):445.[doi:10.19814/j.jese.2022.12018]
　HUANG Qiang-bing,PENG Bo,GOU Yu-xuan,et al.Adaptability and Countermeasures of Metro Shield Tunnels Crossing Ground Fissure Zones in Xi'an, China[J].Journal of Earth Sciences and Environment,2023,45(03):445.[doi:10.19814/j.jese.2022.12018]

备注/Memo

备注/Memo:

收稿日期:2024-09-06; 修回日期:2025-01-03
基金项目:陕西省重点研发计划项目(2024SF2-GJHX-72); 国家自然科学基金项目(42041006); 自然资源部地裂缝地质灾害重点实验室开放基金项目(EFGD20240609,EFGD20240610)
*通信作者:黄强兵(1972-),男,湖南安化人,长安大学教授,博士研究生导师,工学博士,E-mail:hqb@chd.edu.cn。

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