A preliminary study on economical efficiency of a room-and-pillar excavation method in comparison with 2-arch tunnelling method

Chulho Lee; Soo-Ho Chang; Sung-Youll Ahn; Hyu-Soung Shin

doi:10.9711/KTAJ.2013.15.6.599

All Issue

2013 Vol.15, Issue 6 Preview Page Next Page

A preliminary study on economical efficiency of a room-and-pillar excavation method in comparison with 2-arch tunnelling method 2아치 터널 굴착 공법과의 비교를 통한 주방식 굴착 공법의 예비 경제성 검토 연구

30 November 2013. pp. 599-612

PDF XML

Abstract

This study aims to investigate an economical efficiency of two excavation methods with respect to the room-and-pillar method for the underground space and conventional excavation method, i.e. 2-arch tunnelling method. For feasibility study, an excavation cost for both room-and-pillar method and 2-arch tunnelling method was estimated when the same space in operation was required. It was assumed that properties of reinforcements and rock were adopted from literatures. However, an excavation shape of the room-and-pillar method was assumed not to be the rectangular shape which is a general type in the room-and-pillar method but to be an arch shape in order to compare with the conventional excavation method (2-arch tunnelling) and to achieve the maximum bearing capacity of the structure during excavation. Consequently, the wider space in use or required and the better condition of rock we assumed, the more economical advantage we have in the room-and-pillar method than the 2-arch tunnelling method.

Keywords

Room and pillar method

Rock pillar

Economical efficiency

2-arch tunnel

Excavation

본 연구에서는 지하공간 건설을 위한 주방식 공법에 대해 기존 전통적인 지하공간 건설공법에 대비한 공사비 측면의 경제성 검토를 가정된 전형적인 지반조건에 대해 수행하였다. 경제성 비교검토를 위해 지하철 역사 등 대규모 지하공간 조성에 적용되고 있는 전통적인 공법 중 하나인, 2아치 터널 굴착 공법을 비교대상 공법으로 선정하고 동일한 공용 단면적을 확보하도록 굴착하였을 때 소요되는 공사비를 산정하여 비교하고 타당성을 검토하였다. 주방식 공법에 적용할 보강 공법 등은 기존 공법에서 사용하는 방식을 차용하는 것으로 가정하였으며 특히, 굴착 공사의 경우, 주방식 공법은 대체적으로 직사각형 단면을 사용하나 기존 공법과의 비교를 위해, 그리고 공간 천정부 및 암주부의 지반 자체 지지력을 최대한 증가시키기 위해 아치형의 터널 형태로 굴착하는 것으로 가정한 검토를 수행하였다. 검토 결과, 건설 요구 공간이 넓어질수록, 암반의 상태가 양호할수록 기존 전통 터널공법 대비 주방식 공법의 경제성이 더욱 향상될 수 있는 것으로 파악되었다.

키워드

주방식 공법

암주

경제성

2아치 터널

굴착

References

1.Bieniawski, Z.T. (1967) “Mechanism of brittle failure of rock”, J. of Rock Mech. and Min. Sci. Vol. 4. No. 4, pp. 395-430.

2.Bieniawski, Z.T. (1976), “Rock mass classification in rock engineering”, Exploration for Rock Engineering, Proc. of the Syrup., Balkema, London, Vol. 1, pp. 97-106.

3.Hartman, H.L., Mutmansky, J.M. (2002), Introductory Mining Engineering, 2nd edition, Wiley, New Jersey.

4.HDEC (2010), Analysis report of TK preliminary design for the riverside expressway, Hyundai Engineering and Construction (in Korean).

5.KICT (2008), Study on reinforcements pattern of tunnel with high performance reinforcement, Korea Institute of Construction and Technology (in Korean).

6.Lee, C., Chang, S.-H., Shin, H.-S. (2013), “A numerical study on evaluation of unsuported pillar strength in the room and pillar method”, Journal of Korean Tunnelling and Underground Space Association, Vol. 15, No. 04, pp. 444-453 (in Korean).

7.Lee, I.M. (2003), Rock mechanics, Seron (in Korean).

8.MILT (2007), Design criteria of tunnel, Ministry of Land, Infrastructure and Transport, pp. 52 (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 : 15
No :6
Pages :599-612
Received Date : 2013-11-05
Revised Date : 2013-11-08
Accepted Date : 2013-11-12
DOI :https://doi.org/10.9711/KTAJ.2013.15.6.599

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

All Issue