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Evaluation of the Stability for Underground Tourist Cavern in an Abandoned Coal Mine  

Han Kong-Chang (한국지질자원연구원)
Jeon Yang-Soo (한국지질자원연구원)
Publication Information
Tunnel and Underground Space / v.15, no.6, 2005 , pp. 425-431 More about this Journal
Abstract
A series of geotechnical surveys and in-situ tests were carried out to evaluate the stability of underground mine cave in an abandoned coal mine. After the closure of the mine, the underground mine drifts have been utilized for a tourist route since 1999. The dimension of the main cave is 5m width, 3m height and 230m length. The surrounding rock mass of the cave is consist of black shale, coal and limestone. Also, the main cave is intersected by two fault zone. Detailed field investigations including Rock Mass Rating(RMR), Geological Strength Index(GSI) and Q classification were performed to evaluate the stability of the main cave and to examine the necessity of reinforcement. Based on the results of rock mass classification and numerical analysis, suitable support design was recommended for the main cave. RMR and Q values of the rock masses were classified in the range of fair to good. According to the support categories proposed by Grimstad & Barton(1993), these classes fall in the reinforcement category of the Type 3 to Type 1. A Type 3 reinforcement category signifies systematic bolting and no support is necessary for the Type 1 case. From the result of numerical analysis, it was inferred that additional support on the several unstable blocks is required to ensure stability of the cave.
Keywords
Underground mine cave; Rock mass classification; Reinforcement; Numerical analysis;
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1 조민조, 1990, 문경탄전 서남부 가은지역의 지질구조 연구, 석사학위논문, 서울대학교, p.42
2 Serafim, LJ. and PJ., Pereira, 1983, Consideration on the geomechanical classification of Bieniawski, Proc. int. symp. on engineering geology and underground construction, Vol. 2. pp.33-42
3 ISRM, 1981, Rock Characterization Testing & MonitoringI SRM Suggested Methods, Pergamon, p.221
4 Grimstad, E. and N.R., Barton, 1993, Updating the Q-System for NMT, Proc. int. symp. on sprayed concretemodern use of mix sprayed concrete for underground support, Fagernes,(eds Kompen, Opsahl and Berg), Oslo, Norwegian Concrete Assn
5 대한광업회, 1090, 광산보안법, p.328
6 대한석탄공사, 2004, 광업소별 매장량, p.391
7 Barton, N.R., R., Lien, and J., Lunde, 1974. Engineering classification of rock mass for the design of tunnel support, Rock Mech. 6.4, pp.189 - 239   DOI
8 Trueman, R., 1988, An evaluation of strata support techniques in dual life gateroads, PhD Thesis. Univ. of Wales
9 Bieniawski, ZT, 1989, Engineering Rock mass Classifications, New York, Wiley
10 Itasca Consulting Group, 2004, UDEC version 4.0 Manual
11 Hoek, E., P.K., Kaiser and W.F., Bawden, 1995, Support of Underground Excavations in Hard Rock, Rotterdam, Balkema