A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Analysis of the Deformation Characteristics of the Surrounding Rock Mass of a Deep Tunnel During Excavation Through a Fracture Zone
Abstract Aiming at geological disasters triggered by fracture zones in the surrounding rock mass during the excavation of deep railway tunnels, deformation and failure of the surrounding rock mass triggered by sudden changes of rock quality encountered in a tunnel excavation project were investigated. This research conducted an analysis of a field case: the Daliang Tunnel on the Gansu–Qinghai section of the Lanzhou–Urumuqi second double-track railway in China. The deformation profiles of the surrounding rock mass at different distances from the fracture zone was evaluated. The deformation of the surrounding rock mass in and around the fracture zone was explored by combining in-situ measurement, theoretical research, and numerical simulation. Furthermore, relationships of deformation of the surrounding rock mass in the section of the fracture zone with the materials and length of advanced support as well as the excavation advance rate behind the fracture zone were elucidated. Analysis of the results indicated that there is an inflection point on the deformation curves of the surrounding rock mass far ahead of the fracture zone; however, it is difficult to observe the inflection point on deformation curves of the surrounding rock mass in engineering practice as the rocks have undergone substantial deformation before being exposed. A combination of material properties and length of advanced support is conducive to controlling the deformation of the surrounding rock mass in the fracture zone.
Highlights Deformation curves of surrounding rocks exposed ahead of a fracture zone have an inflection point.The efficiency is optimal when the length of advanced support is twice the width of the fracture zone.Fitted lines of deformation of support for surrounding rocks in the fracture zone pass through the origin.
Analysis of the Deformation Characteristics of the Surrounding Rock Mass of a Deep Tunnel During Excavation Through a Fracture Zone
Abstract Aiming at geological disasters triggered by fracture zones in the surrounding rock mass during the excavation of deep railway tunnels, deformation and failure of the surrounding rock mass triggered by sudden changes of rock quality encountered in a tunnel excavation project were investigated. This research conducted an analysis of a field case: the Daliang Tunnel on the Gansu–Qinghai section of the Lanzhou–Urumuqi second double-track railway in China. The deformation profiles of the surrounding rock mass at different distances from the fracture zone was evaluated. The deformation of the surrounding rock mass in and around the fracture zone was explored by combining in-situ measurement, theoretical research, and numerical simulation. Furthermore, relationships of deformation of the surrounding rock mass in the section of the fracture zone with the materials and length of advanced support as well as the excavation advance rate behind the fracture zone were elucidated. Analysis of the results indicated that there is an inflection point on the deformation curves of the surrounding rock mass far ahead of the fracture zone; however, it is difficult to observe the inflection point on deformation curves of the surrounding rock mass in engineering practice as the rocks have undergone substantial deformation before being exposed. A combination of material properties and length of advanced support is conducive to controlling the deformation of the surrounding rock mass in the fracture zone.
Highlights Deformation curves of surrounding rocks exposed ahead of a fracture zone have an inflection point.The efficiency is optimal when the length of advanced support is twice the width of the fracture zone.Fitted lines of deformation of support for surrounding rocks in the fracture zone pass through the origin.
Analysis of the Deformation Characteristics of the Surrounding Rock Mass of a Deep Tunnel During Excavation Through a Fracture Zone
Huang, Junhong (author) / Wei, Xiaoqing (author) / Luo, Yi (author) / Gong, Hangli (author) / Liu, Tingting (author) / Li, Xinping (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Analysis model for the excavation damage zone in surrounding rock mass of circular tunnel
| Online Contents | 2013
Analysis model for the excavation damage zone in surrounding rock mass of circular tunnel
| British Library Online Contents | 2013
Failure responses of rock tunnel faces during excavation through the fault-fracture zone
| DOAJ | 2023
Failure responses of rock tunnel faces during excavation through the fault-fracture zone
| Elsevier | 2023