![]() 10 coal seam of the Pingdingshan coal mine. Based on the numerical simulation results, a field test was carried out in the No. By comparing and analyzing the blasting stress nephograms, stress time-history curves, and crack expansion curves, the optimal blasthole diameter, charge position, and charge length are obtained. ANSYS/LS-DYNA software is used to establish a 3-dimensional cumulative blasting model. ![]() ![]() To improve gas extraction efficiency in high gas and low permeability coal seams while ensuring blasting security, deep hole cumulative blasting parameters were optimized. Coal seam gas extraction is an important means of exploiting and utilizing gas resources, as well as a means of preventing coal mine disasters.
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