Optimization of Transition Zone Thickness and Numerical Analysis for Deep Hard-Rock Mining

doi:10.12068/j.issn.1005-3026.2015.04.025

Abstract

Abstract: Aiming at the ground control problem during underground stoping at deep iron mine， some reasonable stope parameters were chosen and optimized. In consideration of weak intercalated layer would influence the stability of transition zone， 3 kinds of alternative thickness of the transition zone which were 8.5， 10 and 12m were selected by using limit equilibrium method. Besides， three-dimensional numerical model was established with the large-scale numerical analysis software FLAC 3D， which was used to make a comparative analysis of its stability. Numerical results showed that the stress concentration during the process of mining becomes less obvious and the displacement of roof decreases with the increasing thickness of transition zone， and the plastic zone at only 12m thickness of transition zone has not been connected. It follows that 12m transition zone can guarantee stope stability， and satisfy safety production requirements during the transition period， which provides basis for the safe production of mine transition.

Key words: deep mining, weak intercalated layer, stope parameters, thickness of transition zone, numerical analysis

CLC Number:

TD327

LIU Dun-wen， CHU Fu-jiao， REN Gao-feng， WU Di. Optimization of Transition Zone Thickness and Numerical Analysis for Deep Hard-Rock Mining[J]. Journal of Northeastern University Natural Science, 2015, 36(4): 571-575.

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