College of Safety Science and Engineering, Liaoning Technical University, Fuxin Liaoning, China.
Key Laboratory of Thermal Dynamic Disaster Prevention and Control of Ministry of Education, Liaoning Technical University, Huludao Liaoning, China.
PLoS One. 2023 Jan 23;18(1):e0280742. doi: 10.1371/journal.pone.0280742. eCollection 2023.
In this study, we sought to improve the efficiency of coal seam gas extraction, master the characteristics of different factors on the liquid carbon dioxide (CO2) phase change blasting cracking radius, and effectively predict the hole spacing. In this study, we used ANSYS/LS-DYNA numerical simulation software to predict the crack radius of liquid CO2 phase change blasting combined with orthogonal design scheme. The results showed that the primary and secondary factors affecting the fracture radius of liquid CO2 phase change blasting were in ground stress, gas pressure, coal firmness coefficient, and gas content. The fracture radius decreased with the increase of in ground stress and decreased with the increase of gas pressure, coal firmness coefficient, and gas content, which was linear. A prediction model for predicting the cracking radius of liquid CO2 phase change blasting based on four groups of different factors was established. Through the double verification of numerical simulation and field industrial test, the cracking radius of liquid CO2 phase change blasting ranged from 2 m to 2.5 m. The maximum error of numerical simulation was 2.8%, and the maximum error of field industrial test was 5.93%.
在这项研究中，我们试图提高煤层气抽采效率，掌握不同因素对液态二氧化碳（CO2）相变爆破破裂半径的影响规律，并有效预测钻孔间距。在这项研究中，我们使用 ANSYS/LS-DYNA 数值模拟软件，结合正交设计方案，预测了液态 CO2 相变爆破的裂缝半径。结果表明，影响液态 CO2 相变爆破裂缝半径的主次因素依次为地应力、气压、煤的坚固性系数和瓦斯含量。裂缝半径随地应力的增加而减小，随气压、煤的坚固性系数和瓦斯含量的增加而线性减小。建立了基于四组不同因素预测液态 CO2 相变爆破裂缝半径的预测模型。通过数值模拟和现场工业试验的双重验证，液态 CO2 相变爆破的裂缝半径范围为 2m 至 2.5m。数值模拟的最大误差为 2.8%，现场工业试验的最大误差为 5.93%。
