[논문]폐광산 채움재와 암반 경계부의 전단 및 접합특성에 관한 기초 연구

김병렬; 이현우; 김영진; 조계홍; 최성웅

doi:10.7474/tus.2021.31.6.623

폐광산 채움재와 암반 경계부의 전단 및 접합특성에 관한 기초 연구
A Fundamental Study on Shearing/Bonding Characteristics of Interface Between Rock Mass and Backfills in Mine Openings 원문보기

터널과 지하공간: 한국암반공학회지 = Tunnel and underground space, v.31 no.6, 2021년, pp.623 - 646

김병렬 (한국석회석신소재연구소) , 이현우 (강원대학교 신산업개발T-EMS융합전공) , 김영진 (한국석회석신소재연구소) , 조계홍 (한국석회석신소재연구소) , 최성웅 (강원대학교 에너지.자원공학전공 및 신산업개발T-EMS융합전공)

초록
AI-Helper

국내외적으로 전기화의 가속으로 인해 전력수요가 급증됨에 따라, 석탄화력발전소의 수요가 늘어나고 있다. 석탄화력발전소는 경제적으로 많은 이점이 있지만, 대기오염물질 증가, 발전회의 매립 처분에 의한 오염 유발 가능성 등의 환경적인 문제를 수반하고 있다. 특히, 발전부산물인 발전회의 경우에는 재활용률이 70%에 그치고 있으며, 나머지는 전량 매립되고 있다. 본 연구에서는 발전회의 재활용률을 증대시키고 지하에 위치하는 폐광산의 지반 안정성을 확보하기 위하여, 발전회를 폐광산 채움재로 이용하여 지하 폐광산의 채굴 공동을 충전하는 방안에 대한 기초연구를 수행하였다. 암반과 폐광산 채움재의 접합부에서 상호작용에 의한 충전 및 지반보강 효과를 분석하기 위하여, 다양한 거칠기를 갖는 절리면 모사 시료를 제작하여 접합강도 시험과 직접 전단시험을 수행하고 이에 대한 통계분석을 수행하여 절리면의 거칠기와 재령일에 따른 접합 및 전단거동 특성을 규명하였다. 또한 접합부 거동특성이 전산해석 기법을 이용한 지반안정성 분석에 미치는 영향을 검토하기 위하여 지하광산을 모델링하고 접합부 유무에 따른 거동특성을 비교하였다.

Abstract ▼ AI-Helper

As the demand for electric power increases with acceleration of electrification at home and abroad, the needs for coal-fired electrical power plant are accordingly increased. However, these coal-fired electrical power plants induce also many environmental problems such as increase of air pollutants, increase of possibility of land contamination by reclamation of coal ash, even though these power plants have a good economical efficiency. In case of a by-product of coal-fired electrical power plants, only 70% of them are recycled and the remaining 30% of by-product are fully buried in surrounding ground. Consequently, this study deals with coal ash backfilling mechanism in abandoned mine openings for the purposes of increasing the coal ash recycling rate as well as securing the mine area stability. In order to analyze the backfill and ground reinforcement by interaction between rock mass and backfills, the copying samples of discontinuous surface with different roughnesses were produced for bond strength tests and direct shear tests. And statistical analysis was also conducted to decide the characteristics of bond and shear behavior with joint roughness and their curing day. Numerical simulations were also analyzed for examining the effect of interface behavior on ground stability.

주제어

표/그림 (26)

그림 Fig. 1. Cemented paste backfill method (Sivakugan et al., 2015)
그림 Fig. 2. Cemented paste backfill materials of abandoned mine
그림 Fig. 3. Grain size distribution of limestone tailing
표 Table 1. Flowability range of controlled low-strength materials (ACI, 2005)
표 Table 2. Mixture proportion of backfill materials
그림 Fig. 4. Manufacturing process of uniaxial compressive strength test specimen
그림 Fig. 5. Test setup for uniaxial compressive strength measurement
그림 Fig. 6. Effect of fly-ash content on uniaxial compressive strength at each curing day
그림 Fig. 7. Schematic of a backfilled mine opening
그림 Fig. 8. Joint Roughness Coefficient(JRC) for different surface roughness profiles (Barton & Choubey, 1977)
그림 Fig. 9. Measurement of joint surfaces using 3D profiler
그림 Fig. 10. Manufacturing process for bond strength test of rock-backfill material interface
표 Table 3. Physical and mechanical properties of mortar specimen cured at 28 days
그림 Fig. 11. Manufacturing process for direct shear test of rock-backfill material interface
그림 Fig. 12. Test setup for bond strength measurement of rock-backfill material interface
그림 Fig. 13. Effect of JRC on bond strength of fly-ash specimens at each curing day
표 Table 4. Result of regression analysis of bond strength test
그림 Fig. 14. Influence of JRC and curing day on the peak shear strength
표 Table 5. Result of regression analysis of direct shear test
그림 Fig. 15. Generation of numerical model for the test bed
표 Table 6. Physical and mechanical properties of intact rock used in numerical analysis (Kwon et al., 2016)
표 Table 7. Physical and mechanical properties of backfill material used in numerical analysis at 7 curing days
그림 Fig. 16. Result of numerical analysis after excavation
표 Table 8. Physical and mechanical properties of interfaces between rock and backfill material used in numerical analysis at 7 curing days
그림 Fig. 17. Result of numerical analysis after 45% backfill, obtained by numerical models with and without interface elements
그림 Fig. 18. Result of numerical analysis after 90% backfill, obtained by numerical models with and without interface elements

참고문헌 (29)

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상세보기
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상세보기
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상세보기
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