광산갱도 안정성 향상을 위한 숏크리트의 갱도지보 적용성 평가
A Study on Application of Shotcrete for Improvement of Stability of Mine drift
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초록
본 연구에서는 현장조사 및 설문조사를 통해 광산 공급골재의 문제점과 국내 광산의 갱도 지보시공 실태를 파악하였다. 갱도 보강에 가장 효율적인 지보 조합을 도출하기 위해 수치해석을 수행하였으며, 숏크리트/록볼트 조합이 내공변위 및 천단변위가 균형되게 배분되어 발생되었고, 지보재에 작용하는 부재력도 허용치 이내로 가장 안정적인 복합지보임을 확인하였다. 초기 및 중장기 압축강도, 휨강도, 휨인성 등에서 국내 품질기준을 만족하는 표준배합을 도출하였다. 또한, 고성능 및 경제성 배합을 도출하기 위해 광물계 혼화재를 적용하여 실내 및 현장 적용성 평가를 실시하였고, 광산현장의 특수한 상황(파쇄대 및 연약지반)에 따라 효과적인 대응이 가능한 고성능 배합과 갱도 보강에 요구되는 적정 강도를 유지하면서도 경제성을 높일 수 있는 배합을 제안하였다.
Abstract
In this application study, the problem of the aggregate supplied the domestic mine and the mine support conditions were investigated by field survey and opinion poll. The numerical analysis was performed to draw more effective double-support of mine and the result was confirmed that Shotcrete/Rock bolt combination was safer than other double-support. It was proposed that the Standard mix of mine shotcrete passed the test of the domestic quality standard about the short and long-age compressive strength, flexural strength and equivalent flexural strength. The lab and field test was performed to draw the High-performance and the Economical mix of mine shotcrete, And it was proposed that the High-performance mix can be handled on special situation(fractured zone and weak ground) and the Economical mix can be maintained the optimal strength without high price material.
참고문헌 (17)
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