Forensic study on tunnel collapse in deep and fractured rock

K. H. Kim, J. H. Jeong, J. H. Shin, S. H. Kim, S. S. Jeong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A tunnel collapse occurred in a deep fractured rock. The cover depth of the tunnel was over 70m, and its height and width were 7.7m and 11.6m, respectively. The length of tunnel collapse was 14m and total volume of rock fragments flowed into the tunnel was about 600m3. To identify the failure mechanism, detailed investigation including additional rock drilling, theoretical review and numerical back analysis were performed. Vertical and horizontal drilling revealed that the rock was severely fractured with faults, and the area of rock fall developed to the distance of 14.4m from the tunnel crown. It was revealed that the blast excavation disturbed the rock mass and triggered raveling of rock fragments, and finally caused mass rock fall. Measures reinforcing the ground around the tunnel and further excavation method and procedure were proposed.

Original languageEnglish
Title of host publicationTunnels and Underground Cities
Subtitle of host publicationEngineering and Innovation meet Archaeology, Architecture and Art- Proceedings of the WTC 2019 ITA-AITES World Tunnel Congress
EditorsDaniele Peila, Giulia Viggiani, Giulia Viggiani, Tarcisio Celestino
PublisherCRC Press/Balkema
Pages909-917
Number of pages9
ISBN (Print)9781138388659
DOIs
Publication statusPublished - 2019 Jan 1
EventWorld Tunnel Congress, WTC 2019 and the 45th General Assembly of the International Tunnelling and Underground Space Association, ITA-AITES 2019 - Naples, Italy
Duration: 2019 May 32019 May 9

Publication series

NameTunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art- Proceedings of the WTC 2019 ITA-AITES World Tunnel Congress

Conference

ConferenceWorld Tunnel Congress, WTC 2019 and the 45th General Assembly of the International Tunnelling and Underground Space Association, ITA-AITES 2019
CountryItaly
CityNaples
Period19/5/319/5/9

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All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Building and Construction

Cite this

Kim, K. H., Jeong, J. H., Shin, J. H., Kim, S. H., & Jeong, S. S. (2019). Forensic study on tunnel collapse in deep and fractured rock. In D. Peila, G. Viggiani, G. Viggiani, & T. Celestino (Eds.), Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art- Proceedings of the WTC 2019 ITA-AITES World Tunnel Congress (pp. 909-917). (Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art- Proceedings of the WTC 2019 ITA-AITES World Tunnel Congress). CRC Press/Balkema. https://doi.org/10.1201/9780429424441-97