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http://dx.doi.org/10.9711/KTAJ.2021.23.6.577

A study on the effect of ground conditions of room and pillar method on pillar and room strain  

Ham, Hyeon Su (R&D, ESCO Consultant & Engineers Company)
Kim, Yong Kyu (R&D, ESCO Consultant & Engineers Company)
Park, Chi Myeon (ESCO Consultant & Engineers Company)
Lee, Chul Ho (Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology)
Kim, YoungSeok (Dept. of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.23, no.6, 2021 , pp. 577-587 More about this Journal
Abstract
Room and Pillar method is an underground facility construction method that maximizes the strength of the in-situ ground. In order to secure the safety of the underground space, it is necessary to secure the safety of the room actually used in addition to the safety of pillar of the room and Pillar method. In this study, the evaluation method for the safety of the room and rock pillar in the room and pillar method was studied through numerical analysis. Numerical analysis was performed for a total of 125 cases using ground conditions, pillar width, and room width as parameters, and the results were derived. As for the safety factor of the pillar, it was confirmed that the safety factor increased when the strength of the ground increased, and it was confirmed that the increment in the safety factor decreased when the width of the pillar was widened. The room strain was evaluated by applying the Critical strain. As the width of the pillar became narrower, the Critical strain was higher, and as the width of the room became smaller, the Critical strain was smaller. As a result of the correlation analysis between the safety factor of the pillar and the room strain, it was possible to derive the upper limit of the room strain that can secure the standard safety factor of the pillar according to the width of the pillar. It is judged that the results derived from this study can be used as a guideline to secure the safety of the room when the actual design is performed in consideration of the ground conditions and room width.
Keywords
Underground space; Room-and-pillar method; Safety factor of pillar; room strain; Critical strain;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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1 Chang, S.H., Lee, C.H., Choi, S.W., Hur, J.S., Hwang, J.D. (2014), "Design of unsupported rock pillars in a room-and-pillar underground structure by the tributary area method and the pillar strength estimation", Tunnel and Under Space, Vol. 24, No. 5, pp. 335-343.   DOI
2 Esterhuizen, G.S., Dolinar, D.R., Ellenberger, J.L., Prosser, L.J. (2011), "Pillar and roof span design guidelines for underground stone mines", Department Of Health And Human Services, NIOSH, IC9526, United States of America.
3 Hoek, E., Brown, E.T. (1980), "Underground excavation in rock", Institution of Mining and Metallurgy, CRC Press, pp. 202-203.
4 Sakurai, S., Kawashima, I., Otani, T. (1995), "A criterion for assessing the stability of tunnels", Eurock'93, Ribeiro e Sousa & Grossmann (eds.), pp. 969-973.
5 Lee, C., Chang, S.H., Shin, H.S. (2013c), "A study on conceptual evaluation of structural stability of room-and-pillar underground space", Journal of Korean Tunnelling and Underground Space Association, Vol. 15, No. 6, pp. 585-597.   DOI
6 Lee, C., Hyun, Y., Song, J., Chang, S.H. (2015), "A preliminary study on the excavation sequence of a room-and-pillar underground structure by the drill-and-blast method", Journal of Korean Tunnelling and Underground Space Association, Vol. 17, No. 6, pp. 605-614.   DOI
7 Sakurai, S. (1982), "An evaluation technique of displacement measurements in tunnels", Proceedings of the Japan Society of Civil Engineers, Vol. 317, pp. 93-100.   DOI
8 Lee, C., Chang, S.H., Shin, H.S. (2013b), "A numerical study on evaluation of unsupported pillar strength in the room and pillar method", Journal of Korean Tunnelling and Underground Space Association, Vol. 15, No. 4, pp. 443-453.   DOI
9 Bullock, R.L. (2011), "Room-and-pillar mining in hard rock", Chapter 13.1, SME Mining Engineering Handbook, P. Darling (ed.), SME, pp. 1327-1338.
10 Hartman, H.L., Mutmansky, J.M. (2002), "Introductory mining engineering", John Wiley and Sons, New Jersey, pp. 323-332.
11 Sakurai, S. (1997), "Lesson learned from field measurements in tunnelling", Tunnelling and Underground Space Technology, Vol. 12, No. 4, pp. 453-460.   DOI
12 Lee, C., Chang, S.H., Ahn, S.Y., Shin, H.S. (2013a), "A preliminary study on economical efficiency of a room-and-pillar excavation method in comparison with 2-arch tunnelling method", Journal of Korean Tunnelling and Underground Space Association, Vol. 15, No. 6, pp. 599-612.   DOI