Stress Evolution Characteristics of Lower Slice Coal Body During Mining the Thick Coal Seam
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Slice mining is commonly used in mining thick coal seam (i.e., mining height greater than 3.5 m), where there is risk of coal and gas outbursts. After mining the upper slice workface, stress fields of lower slice coal body would change, which would affect the safe and efficient mining of the lower slice workface. Based on the slice mining practice of the Qudi coal mine in China, stress distribution characteristics of lower slice coal body with two adjacent upper slice workface being mined are studied by numerical simulation. Research results from numerical simulation were used to choose the location about the crossheading and prevent the outburst of the lower slice workface. Finally, rationality of numerical simulation is verified by field measurements.
KeywordsThick coal seam Outburst prevention Safe mining Numerical simulation
This work was supported by the Science and technology research project of Henan Province (172102310640), the State Key Laboratory Cultivation Base for Gas Geology and Gas Control of Henan Province (WS2017B13, Henan Polytechnic University), China Postdoctoral Science Foundation (2014M561989), the Ph.D. Foundation of Henan Polytechnic University (B2014-001), Support Program on Science and Technology Innovation of University in Henan Province (17IRTSTHN030), Key Scientific Research Projects of Colleges of the Henan province (16A440005) and National Foundation for the Youth of China (No. 51504084).
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