Deformation characteristics of tunnel bottom after construction under geological conditions of long-term deformation
- Title
- Deformation characteristics of tunnel bottom after construction under geological conditions of long-term deformation
- Author
- 박두희
- Keywords
- tunnel bottom; long-term deformation; tunnel construction
- Issue Date
- 2020-02
- Publisher
- TECHNO-PRESS
- Citation
- GEOMECHANICS AND ENGINEERING, v. 21, no. 2, page. 171-178
- Abstract
- Mountainous areas cover more than 70% of Korea. With the rapid increase in tunnel construction, tunnel-collapse incidents and excessive deformation are occurring more frequently. In addition, longer tunnel structures are being constructed, and geologically weaker ground conditions are increasingly being encountered during the construction process. Tunnels constructed under weak ground conditions exhibit long-term deformation behavior that leads to tunnel instability. This study analyzes the behavior of the bottom region of tunnels under geological conditions of long-term deformation. Long-term deformation causes various types of damage, such as cracks and ridges in the packing part of tunnels, as well as cracks and upheavals in the pavement of tunnels. We observed rapid tunnel over-displacement due to the squeezing of a fault rupture zone after the inflow of a large amount of groundwater. Excessive increments in the support member strength resulted in damage to the support and tunnel bottom. In addition, upward infiltration pressure on the tunnel road was found to cause severe pavement damage. Furthermore, smectite (a highly expandable mineral), chlorite, illite, and hematite, were also observed. Soil samples and rock samples containing clay minerals were found to have greater expansibility than general soil samples. Considering these findings, countermeasures against the deformation of tunnel bottoms are required.
- URI
- http://www.techno-press.org/content/?page=article&journal=gae&volume=21&num=2&ordernum=9https://repository.hanyang.ac.kr/handle/20.500.11754/161147
- ISSN
- 2005-307X; 2092-6219
- DOI
- 10.12989/gae.2020.21.2.171
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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