Geotech Geol Eng https://doi.org/10.1007/s10706-018-0600-1 ORIGINAL PAPER Analysis of Pressure Relief Effect on the Protective Layer of Hard Roof and Extra-Thickness Coal Seam Mining Zhongchang Wang Wenrui Bian Received: 31 March 2018 / Accepted: 4 June 2018 Springer International Publishing AG, part of Springer Nature 2018 Abstract The roof of Tashan coal mine was hard compacted with the advance of the working face. The and difﬁcult to fall. In the process of fully mechanized maximum principal stress of the liberated layer was W coal caving in the Carboniferous extra-thick coal type distribution. The expansion deformation of 3–5 seam, the strong pressure and rock burst appeared in coal was M type distribution. The working resistance the working face. To obtain the pressure relief effect of of the 8107 working face was mainly distributed in the exploitation of Shan 4 protective seam in Tashan 8000–12,000 kN. The working resistance of the 8108 coal mine, The stress distribution and displacement working face was mainly distributed in variation of the roof and ﬂoor of Shan 4 protective 4000–10,000 kN. The vertical stress of the roof of layer were obtained by numerical simulation. And by the 3–5 coal was decreased by about 30% after mine
Geotechnical and Geological Engineering – Springer Journals
Published: Jun 6, 2018
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