Review on the buoyancy effect of the multi purpose double-deck tunnels during operation

Ho-jong Kim; Hyeon-ah Kim; Eun-jung Joo; Jong-ho Shin

doi:10.9711/KTAJ.2015.17.6.623

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2015 Vol.17, Issue 6 Preview Page Next Page

Review on the buoyancy effect of the multi purpose double-deck tunnels during operation 운영중 다목적 복층터널의 부력영향 검토

30 November 2015. pp. 623-635

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Abstract

Double-deck tunnels beneath the groundwater table have relatively large volume and commonly constructed as watertight tunnels. In this case, it requires to secure stability of the tunnels for buoyant force. Generally the contact force between lining and ground is sufficient to resist the buoyant force. However in the long-term the contact force could be reduced because of structural deterioration. In this study the effect of long-term buoyant force acting on the double-deck tunnel is investigated. The results has shown that the buoyant force has increased invert deformation and stress. It is indicated that the contact resilience between lining and ground needs to be kept during tunnel operation.

Keywords

Double-deck tunnel

Lining

Buoyant force

Stress-pore pressure coupled analysis

Ground stiffness

지하수위 아래에 건설되는 복층터널은 비교적 대단면이며 비배수 터널로 건설되는 특징을 가지고 있다. 지하수위 하부에 위치하는 터널은 지하수로 인해 발생하는 부력으로부터 터널의 안정성 확보방안이 필요하다. 일반적으로 터널 라이닝과 지반사이의 경계면에서의 결합력은 부력에 대해 충분한 안정성을 발휘한다. 그러나 장기적인 시간이 경과하면 구조물의 열화로 인하여 결합력이 감소할 수 있다. 본 연구에서는 장기적인 관점에서 부력으로 인한 복층터널의 영향을 조사하였다. 그 결과 부력으로 인해 터널 하단부분에서 변형과 라이닝에 작용하는 응력이 증가하였다. 본 연구로부터 운영중 터널의 라이닝과 지반사이의 결합력을 유지시킬 수 있는 방안이 필요함을 알 수 있다.

키워드

복층터널

라이닝

부력

응력-간극수압 연계해석

지반강성

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 17
No :6
Pages :623-635
Received Date : 2015-10-20
Revised Date : 2015-10-10
Accepted Date : 2015-10-24
DOI :https://doi.org/10.9711/KTAJ.2015.17.6.623

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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