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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.17 No.6

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

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2015, v.17 no.6, pp.675-683




& (2015). A study on drainage system of the room-and-pillar underground structure considering groundwater conditions. (사)한국터널지하공간학회, 17(6), 675-683.

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 지하구조, 배수시스템, 숏크리트, 터널

Reference

1.

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.

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.

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

4.

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.

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.

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.

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).

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