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

지하수 유출수 조건을 고려한 주방식 지하구조의 배수시스템 연구

  • Lee, Chulho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Hyun, Younghwan (ESCO Consultant & Engineers Co., Ltd.) ;
  • Hwang, Jedon (ESCO Consultant & Engineers Co., Ltd.) ;
  • Chang, Soo-Ho (Geotechnical Engineering Research Division, Korea Institute of Civil Engineering and Building Technology)
  • 이철호 (한국건설기술연구원 지반연구소) ;
  • 현영환 ((주)에스코컨설턴트) ;
  • 황제돈 ((주)에스코컨설턴트) ;
  • 장수호 (한국건설기술연구원 지반연구소)
  • Received : 2015.11.10
  • Accepted : 2015.11.20
  • Published : 2015.11.30

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.

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.

Keywords

References

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