The fracture development of the overlying strata after coal mining is an important guarantee of efficient gas drainage. In order to explore the fracture evolution characteristics close to a mined coal seam group. the F15. 16-24130 working face in the Pingdingshan No. https://www.freaknleather.com/product-category/stinger-parts/
Development characteristics of the rock fracture field in strata overlying a mined coal seam group.
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