Stability evaluation of room-and-pillar underground method by 3D numerical analysis model

Byung-Yun Kang; Sanghyuk Bang; Choong-Ky Roh; Dongkwan Kim

doi:10.9711/KTAJ.2023.25.1.001

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2023 Vol.25, Issue 1 Next Page

Technical Paper

Stability evaluation of room-and-pillar underground method by 3D numerical analysis model 3차원 수치해석모델을 이용한 주방식 지하공간의 안정성 평가

31 January 2023. pp. 1-11

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Abstract

In this study, the stability of the room-and-pillar underground method was investigated using numerical analysis method. In-situ geotechnical investigation was conducted, and a supporting pattern was selected based on the geotechnical investigation data. For the supporting pattern, Type-1, 2, 3 were selected for each ground condition. A 3D numerical analysis model was developed for effective simulation as the room-and-pillar underground method consist of a pillar and room. As a review of numerical analysis, it was confirmed that the crown settlement, convergence, shotcrete and rock bolt were all stable in all supporting patterns. As a result of the analysis by the construction stage, it was confirmed that excessive stress was generated in the room when the construction stage of forming pillar. So, precise construction is required during the actual construction stage of the pillar formation.

Keywords

Room-and-pillar underground method

3D numerical analysis

Supporting pattern

본 연구에서는 수치해석을 이용해 주방식 지하공간의 안정성을 검토하고 고찰하였다. 수치해석을 수행하기에 앞서 현장지반조사를 수행하고 지반조사결과를 이용하여 지보패턴을 선정하였다. 지보패턴은 암반 등급 별 Type-1, 2, 3을 선정하였으며 주방식 지하공간은 암주와 지하공간으로 구성된 형상으로 구성되어 효과적인 모사를 위해 3차원 수치해석모델을 개발하였다. 지보패턴 안정성 검토결과, 모든 지보패턴에서 천단변위, 내공변위, 지보재 응력 모두 안정한 것으로 확인되었다. 시공단계에 의한 해석결과, 암주가 형성되는 시공단계에서 지하공간에 과도한 응력이 발생하는 경향이 확인되었다. 이를 통해, 실제 시공 시 암주 형성 시공단계에서 정밀한 시공이 요구될 것으로 판단된다.

키워드

주방식 지하공간

3차원 수치해석

지보패턴

References

Esterhuizen, G.S., Dolinar, D.R., Ellenberger, J.L. (2007), “Observations and evaluation of floor benching effects on pillar stability in U.S. limestone mines”, Proceedings of the 1st Canada - U.S. Rock Mechanics Symposium, Vancouver, Canada, pp. 1-7. 10.1201/NOE0415444019-c179

KICT (2017), Development of key excavation solutions for expandable urban underground space (V), KICT 2017-178, Korea Institute of Civil Engineering and Building Technology, pp. 229-230.

KORES (2019), Development of optimal design standards for the unsupported limestone mine in Korea, Korea Resources Corporation, pp. 30.

Lee, C., Chang, S.H., Shin, H.S. (2013), “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. 10.9711/KTAJ.2013.15.4.443

Lee, C., Hwang, J., Kim, E., Chang, S.H. (2014a), “Consideration on design procedure of room-and-pillar underground structure part I: parametric study”, Journal of Korean Tunnelling and Underground Space Association, Vol. 16, No. 5, pp. 487-495. 10.9711/KTAJ.2014.16.5.487

Lee, C., Hur, J., Hyun, Y., Chang, S.H. (2014b), “Consideration on design procedure of room-and-pillar underground structure part II: selection of shape to design supports”, Journal of Korean Tunnelling and Underground Space Association, Vol. 16, No. 5, pp. 497-506. 10.9711/KTAJ.2014.16.5.497

Okubo, S., Yamatomi, J. (2009), “Underground mining methods and equipment”, Civil Engineering - Volume II, EOLSS Publications Co., Ltd., Oxford, United Kingdom, pp. 171-193.

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 : 25
No :1
Pages :1-11
Received Date : 2022-11-10
Revised Date : 2022-11-30
Accepted Date : 2022-12-05
DOI :https://doi.org/10.9711/KTAJ.2023.25.1.001

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

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