침수-하중조건에서의 암석물성 변화가 암반의 구조적 안정성에 미치는 영향 평가
An Evaluation of the Influence of the Rock Property Change under Saturated-Loading Conditions on Rock Stability
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초록
본 연구에서는 폐광산 주변 암반의 안정성 평가를 위한 침수 환경과 가압조건에 따른 암석물성 변화가지하공간의 안정성에 미치는 영향을 평가하기 위해 수행하였다. 암석물성 변화를 관찰하기 위하여 시료의 절반을 포화시킨 상태(침수조건)와 나머지 절반을 포화시키지 않은 상태(비침수조건)로 구분하였다. 본 실험은 크립시험기를 이용하여 하중을 주어 침수 및 가압환경을 조성하여 실시하였다. 암석 실험 결과에서는 침수조건에서열전도도와 공극률의 물성 변화가 나타났다. 간접인장강도는 하중 증가에 따른 암석강도 저하가 확인되었고, 일축압축강도에서도 침수조건에서 암석강도가 낮게 나타났다. 또한, FLAC3D를 이용한 수치모델링에서는 광주의 안전율이 침수조건에서 저하되는 것을 확인하였다. 폐광산 및 지하공간의 용도변경과 재활용 시에는 광산이운영되었던 초기 암석물성을 사용하지 않고 침수환경에 따른 암석물성 변화를 고려한 암반의 안정성 평가가필요하다.
Abstract
This research was carried out to evaluate the influence of rock property change under saturated-loading condition on the stability of an underground opening. Rock samples were divided into saturated-loading and unsaturated-loading conditions in order to observe the variation of mechanical properties of the rock after loading using a creep test machine. Measured thermal conductivity and porosity from various laboratory tests showed the variation of rock properties. Tensile strength was found to be more significantly decreased in saturated condition. It was also found that uniaxial compressive strength in saturated condition decreased more significantly compared to that in unsaturated condition. A numerical modeling using FLAC3D was carried out to evaluate the stability of a pillar with a consideration of the rock property change expected in saturated-loading condition. It was recommended to use the changed properties instead of the initial rock properties to analyze the stability of the unused underground mines or openings.
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