A study on drainage system of the room-and-pillar underground structure considering groundwater conditions

Chulho Lee; Younghwan Hyun; Jedon Hwang; Soo-Ho Chang

doi:10.9711/KTAJ.2015.17.6.675

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2015 Vol.17, Issue 6 Preview Page Next Page

A study on drainage system of the room-and-pillar underground structure considering groundwater conditions 지하수 유출수 조건을 고려한 주방식 지하구조의 배수시스템 연구

30 November 2015. pp. 675-683

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Abstract

The room-and-pillar construction method for underground space is adopted from the room-and-pillar mining method which is one of the most popular underground mining method in the world. Drainage system in the room-and-pillar underground construction method can be similar with the concept of single shell in tunnel because additional reinforcement except the TSL (thin spray-on liner) is not applied in the room-and-pillar construction method. That is, to decrease groundwater level and maintain safety in tunnel, the drainage pin hole inside lining (shotcrete) can be used. However, if total amount of outflow in the underground structure is relatively small or groundwater is not detected, such drainage system will not be useful and cause additional construction cost. In this study, outflow of conventional tunnels in South Korea was investigated and the criteria to determine whether the drainage pin hole is effective was suggested. And the guided drainage system was suggested when drainage pin hole was not applied in the room-and-pillar construction method.

Keywords

Room-and-pillar underground structure

Drainage system

Shotcrete

Tunnel

주방식 지하구조물은 주방식 채광법의 개념을 이용한 지하구조물 건설 방법이다. 주방식 공법에서 배수는 터널의 싱글쉘 개념과 유사하며, 주방식 지하구조의 장기적인 안정화를 위해서 복공 뒷면의 지하수를 배수하여 지하수위를 사전 저감시키는 방식이 유효하다. 그러나 배수공에 의한 지하수위 저감 방식은 지하 굴착시 굴착면에 지하수압이 작용하지 않거나 발생 용수량이 크지 않다면 배수공은 필요치 않게 된다. 본 연구에서는 지하 굴착시 발생용수량에 따른 배수공 적용 유무를 검토하여 주방식 지하구조에서 배수공 적용 유무를 판단하는 기준을 제안하고자 하며, 배수공 적용이 불필요한 구간에 대해서는 숏크리트를 통한 유도 배수시스템을 제안하고자 한다.

키워드

주방식 지하구조

배수시스템

숏크리트

터널

References

1.Chang, S., Lee, G-P., Han, J-T., Park, Y-T. (2015), “Development of a powder-type thin spray-on liner and its performance evaluation at different curing ages”, Tunnel & Undeerground Space, Vol. 25, No. 3, pp. 293-302 (in Korean).

2.Geo-Front (2000), Design of shotcrete SWG, Design of single shell by shotcrete lining, Single Shell division, Geo-Front research group, p. 21 (in Japanese).

3.KEC (2007), Management plan for outflow of tunnel: Attachment #1 Water Analysis Result for Outflow in Tunnel, Report construction and enviro-nmental division-2409, Korea Express Corporation (in Korean).

4.KICT (2013), Development of Key Excavation Solutions for Expandable Urban Underground Space in Use, Korea Institute of Civil Engineering and Building Technology, Report No. KICT 2013- 225 (in Korean).

5.Lee, C., Chang, S.-H., Ahn, S.-Y., Shin, H.-S. (2013b), “A preliminary study on economical efficiency of a room-and-pillar excavation method in comparison with 2-arch tunnelling method”, J. of Korean Tunn. Undergr. Sp. Assoc., Vol. 15, No. 6, pp. 599-612. (in Korean).

6.Lee, C., Chang, S.-H., Shin, H.-S. (2013a), “A study on conceptual evaluation of structural stability of room-and-pillar underground space”, J. of Korean Tunn. Undergr. Sp. Assoc., Vol. 15, No. 6, pp. 585-597 (in Korean).

7.Shin, J.-H., Kwon, O.-H., Shin, Y.-S., Yang, Y.-H. (2013), “An experimental study on the effect of malfunctioning of drainage system on NATM tunnel linings”, J. of Korea Geotechnical Society, Vol. 23, No. 6, pp. 77-84 (in Korean).

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 :675-683
Received Date : 2015-11-10
Revised Date : 2015-11-19
Accepted Date : 2015-11-20
DOI :https://doi.org/10.9711/KTAJ.2015.17.6.675

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

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