Study on the Synergistic Effect of Coal Pillars and Caved Deposits in Chamber-Type Mining of Steeply Inclined Coal Seams
Source abstract
Abstract
To address the synergistic stability evaluation of coal pillars and caving deposits in room-and-pillar mining of nearly vertical coal seams, this study takes the 101 Coal Mine (104th Regiment, Xishan Area, Urumqi, Xinjiang) as the engineering background. It combines physical similarity simulation and theoretical analysis to explore the synergistic bearing mechanism of coal pillars and caved deposits. Based on limit equilibrium theory, a combined instability criterion considering roof mudstone’s bending-toppling and shear-sliding is established; the Rankine earth pressure theory is modified, and a stability coefficient Ks (reflecting synergistic bearing effect) is proposed to realize quantitative evaluation of goaf stability. A model experiment simulates the mining of a 73° nearly vertical coal seam. Results show the roof instability mode (under coal pillars and caved deposits) is equivalent to anti-dip slope’s toppling-sliding composite failure. Experimental and theoretical results agree well, verifying the model’s rationality and applicability. This study provides a theoretical basis and analytical method for calculating the synergistic stability of coal pillars and caving deposits in nearly vertical coal seams.
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Research context
OpenAlex topics: Geomechanics and Mining Engineering · Rock Mechanics and Modeling · Mining and Gasification Technologies
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Affiliations
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Xuzhou China Mining Geotechnical Technology Co., Ltd., Xuzhou 221144, China
School of Environment and Spatial informatics, China University of Mining and Technology, Xuzhou 221116, China
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