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http://dx.doi.org/10.7474/TUS.2011.21.2.138

Effect of Degradation of Rock Mass Properties Caused by Water Pressure on the Stability of Mine Gallery  

Yoon, Yong-Kyun (세명대학교 소방방재학과)
Baek, Young-Jun (세명대학교 대학원 환경안전시스템공학과)
Jo, Young-Do (한국지질자원연구원)
Publication Information
Tunnel and Underground Space / v.21, no.2, 2011 , pp. 138-144 More about this Journal
Abstract
Mine closure does often accompany the flooding of mine galleries due to ceasing a pumping operation. When a mine gallery is flooded, rocks around the gallery are fully saturated and the gallery is subject to a water pressure. The uniaxial unconfined compressive strength of a rock depends on its water content and decreases as the water content increases. A water pressure may originate the crack growth of a rock or the discontinuity growth of rock mass. Although the water in a gallery will give some support pressure inside the gallery, the degradation of rock mass properties caused by a water pressure will reduce the stability of the gallery. In this study, 2-dimensional discontinuous and 3-dimensional continuous numerical analyses have been conducted to evaluate an effect that a reduction of rock mass properties around the gallery induced by a water pressure has on the stability of mine gallery. The numerical analyses show that a reduction of rock mass properties caused by a water pressure increases displacements of rock mass around mine gallery. 2-dimensional model is found to give larger values of displacement than 3-dimensional model.
Keywords
Mine closure; Mine galleries; Degradation of rock mass properties; Water pressure;
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