|Table of Contents|

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(PDF)

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

Issue:
2025年第03期
Page:
356-370
Research Field:
黄河流域生态保护和高质量发展专刊(上)
Publishing date:

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
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)
Keywords:
metro tunnel;  concealed excavation;  ground fissure;  model test;  ground settlement;  surrounding rock;  stress;  numerical simulation
PACS:
P642.13+1; U45
DOI:
10.19814/j.jese.2024.09008
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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Last Update: 2025-06-20