Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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A preliminary study on the optimum excavation sequence of a room-and-pillar underground structure

주방식 지하구조물의 최적 굴착공정에 대한 예비 분석 연구

  • Lee, Chulho (Geotechnical Engineering Research Division, Korea Institute of Civil Engineering and Building Technology) ;
  • Choi, Soon-Wook (Geotechnical Engineering Research Division, 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) ;
  • 최순욱 (한국건설기술연구원 지반연구소) ;
  • 현영환 ((주)에스코컨설턴트) ;
  • 황제돈 ((주)에스코컨설턴트) ;
  • 장수호 (한국건설기술연구원 지반연구소)
  • Received : 2015.07.15
  • Accepted : 2015.07.27
  • Published : 2015.07.31
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Abstract

A room-and-pillar underground structure is characterized by its grid-type array of galleries. As a result, its construction and economical efficiency can be governed by excavation sequence of galleries. Therefore, this study aims to study the optimum excavation scheme of a room-and-pillar underground structure by considering its various design factors such as ground conditions and excavation sequences. Drill-and-blast method is assumed as a excavation method for a room-and-pillar underground structure. In addition, two kinds of excavation patterns corresponding to a concurrent and a sequential excavation patterns are considered in this study. For the assumed conditions, the structural stability and the construction efficiency based on the number of faces and the travel distance of a jumbo drilling machine are analyzed for the two excavation patterns. Even though the two kinds of excavation patterns show almost the same structural stability as each other, the concurrent excavation pattern is relatively preferable to the sequential excavation pattern in terms of the number of faces in operation and travel distance of a drilling jumbo.

주방식 지하구조물은 여러 개의 갱도 굴착에 의해 형성되는 격자 형태의 구조물이므로, 갱도들의 굴착순서에 따라 주방식 지하구조물의 시공성과 경제성이 좌우될 수 있다. 따라서 본 연구에서는 주방식 지하구조물의 지반조건, 굴착순서 등의 다양한 설계조건들을 고려하여 주방식 공법의 굴착공정을 검토하였다. 굴착공법으로는 발파공법을 가정하였으며, 가로 세로 병행 시공방식과 가로 세로 순차시공방식으로 구분하여 굴착공정을 검토하였다. 굴착순서에 따른 주방식 지하구조물의 안정성과 더불어 굴진면의 개수, 점보드릴의 이동거리 등에 따른 시공성을 분석한 결과, 구조적 안정성에는 큰 차이가 없으나 굴진면 운영 개소와 점보드릴의 이동거리 측면에서 가로 세로 병행 시공방법의 시공성이 상대적으로 유리한 것으로 나타났다.

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References

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