Zhao Dan, Shen Zhiyuan, Li Minghao, Liu Baichen, Chen Yinuo, Xie Lina
College of Safety Science & Engineering, Liaoning Technical University, Fuxin, 123000, China.
Key Laboratory of Mine Thermo-Motive Disaster and Prevention, Ministry of Education, Liaoning Technical University, Huludao, 125105, China.
Sci Rep. 2022 Mar 24;12(1):5126. doi: 10.1038/s41598-022-09219-4.
Coal seam gas extraction is an important means of exploiting and utilizing gas resources, as well as a means of preventing coal mine disasters. To improve gas extraction efficiency in high gas and low permeability coal seams while ensuring blasting security, deep hole cumulative blasting parameters were optimized. ANSYS/LS-DYNA software is used to establish a 3-dimensional cumulative blasting model. 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. Based on the numerical simulation results, a field test was carried out in the No. 10 coal seam of the Pingdingshan coal mine. The test results show that after cumulative blasting, the gas concentration was increased by an average of 2.25 times, the gas purity was increased by an average of 3.78 times, the permeability coefficient of the coal seam was increased by 21 times, and the effective radius of blasting was up to 7 m. The positive effects of deep hole cumulative blasting parameter optimization on the pressure relief and permeability enhancement of a high gas and low permeability coal seam were determined, which can provide a reference for other similar working faces to implement this technology.
煤层气抽采是开发利用瓦斯资源的重要手段，也是预防煤矿灾害的手段。为提高高瓦斯、低透气性煤层的瓦斯抽采效率，同时确保爆破安全，对深孔聚能爆破参数进行了优化。利用ANSYS/LS-DYNA软件建立了三维聚能爆破模型。通过对比分析爆破应力云图、应力时程曲线和裂纹扩展曲线，得出了最佳炮孔直径、装药位置和装药长度。基于数值模拟结果，在平顶山煤矿10号煤层进行了现场试验。试验结果表明，聚能爆破后，瓦斯浓度平均提高了2.25倍，瓦斯纯度平均提高了3.78倍，煤层透气系数提高了21倍，爆破有效半径达7m。确定了深孔聚能爆破参数优化对高瓦斯、低透气性煤层卸压增透的积极作用，可为其他类似工作面实施该技术提供参考。
