Stability evaluation on widening of parallel tunnels

Myeong Han Lee, Sung Yil Koh, Bum Joo Kim, Yeon Soo Jang, Ji Nam Yun

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Widening of tunnels in urban areas, instead of building newtunnels,may become a viable solution for reducing traffic congestion. In the present study, a numerical investigation using FEM was conducted to examine the effect of tunnel widening on the stability. For the purpose, parallel tunnels were analyzed by considering four different widening types. For each case, stress and deformation behaviors of the tunnels were examined and the pillar stabilitywas evaluated.The results indicated that comparing between the tunnel widening cases with the same pillar width after widening, 5 to 20% higher crown settlement was occurred for the tunnels widened uni-laterally than those widened bi-laterally. As expected, the highest shotcrete stress was observed for the tunnels widened to have the narrowest pillar. For all four widening cases, however, the strength/stress ratios for pillar were found to have the values higher than 1.0.

Original languageEnglish
Title of host publicationGeotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 8th Int. Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014
PublisherTaylor and Francis - Balkema
Pages269-273
Number of pages5
ISBN (Print)9781138027008
DOIs
StatePublished - 2014
Event8th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014 - Seoul, Korea, Republic of
Duration: 25 Aug 201427 Aug 2014

Publication series

NameGeotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 8th Int. Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014

Conference

Conference8th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014
Country/TerritoryKorea, Republic of
CitySeoul
Period25/08/1427/08/14

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