当前位置：
X-MOL 学术
›
Energy Sci. Eng.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Study on crack propagation of the CO2 presplitting blasting empty hole effect in coal seam
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-07-20 , DOI: 10.1002/ese3.785 Hongyu Pan 1 , Jingwen Li 1 , Tianjun Zhang 1, 2 , Shugang Li 1 , Lei Zhang 1
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-07-20 , DOI: 10.1002/ese3.785 Hongyu Pan 1 , Jingwen Li 1 , Tianjun Zhang 1, 2 , Shugang Li 1 , Lei Zhang 1
Affiliation
|
CO2 presplitting blasting is an effective method to increase coal seams permeability and improve gas drainage efficiency. During the blasting process, the empty holes in the coal and rock mass have a significant effect on crack growth. In the experiment, a sample containing empty holes was used for CO2 presplitting blasting. The VIC‐3D was used to observe the change in the surface displacement of the sample; and the amplitude of the wave during the blasting process was collected using ultrasonic waves. Here, we calculated the attenuation coefficient α, analyzed the internal crack damage of the coal and rock mass, and compared the LS‐DYNA simulation results to analyze the empty hole effect on the crack growth of the coal and rock mass. The results show that: (a) radial tensile stress is generated due to the superposition of compression waves and reflected waves during blasting, resulting in an approximately straight main crack channel between the blast hole and the empty hole; (b) When both the stress and the attenuation coefficient reach their peaks, a main crack is formed and the most severe damage occurs inside the coal and rock mass; (c) the main crack channel was formed at 0.13 seconds, and the energy consumption reached the peak at 0.18 seconds, the negative linear correlation between energy and stress was obtained. Therefore, the empty hole effect provides a good guide for the crack propagation of the coal and rock mass and provides a new experimental scheme for increasing the permeability of coal seams.
中文翻译：
煤层中CO2预裂爆破空孔效应的裂纹扩展研究
CO 2预裂爆破是提高煤层渗透性和提高瓦斯抽采效率的有效方法。在爆破过程中，煤和岩体中的空洞对裂纹扩展具有重大影响。在实验中，将包含空孔的样品用于CO 2预裂爆破。使用VIC-3D观察样品表面位移的变化。利用超声波采集爆破过程中的波幅。在这里，我们计算了衰减系数α，分析了煤岩的内部裂纹损伤，并比较了LS‐DYNA模拟结果，分析了空洞对煤岩岩体裂纹扩展的影响。结果表明：（a）由于爆破过程中压缩波和反射波的叠加而产生径向拉伸应力，从而在爆破孔和空孔之间形成了一条大致笔直的主裂纹通道；（b）当应力和衰减系数都达到峰值时，就形成了一个主裂缝，并且在煤和岩体内部发生的破坏最为严重；（c）在0.13秒形成主裂纹通道，能量消耗在0.18秒达到峰值，能量与应力之间呈负线性关系。因此，
更新日期：2020-07-20
中文翻译：
煤层中CO2预裂爆破空孔效应的裂纹扩展研究
CO 2预裂爆破是提高煤层渗透性和提高瓦斯抽采效率的有效方法。在爆破过程中，煤和岩体中的空洞对裂纹扩展具有重大影响。在实验中，将包含空孔的样品用于CO 2预裂爆破。使用VIC-3D观察样品表面位移的变化。利用超声波采集爆破过程中的波幅。在这里，我们计算了衰减系数α，分析了煤岩的内部裂纹损伤，并比较了LS‐DYNA模拟结果，分析了空洞对煤岩岩体裂纹扩展的影响。结果表明：（a）由于爆破过程中压缩波和反射波的叠加而产生径向拉伸应力，从而在爆破孔和空孔之间形成了一条大致笔直的主裂纹通道；（b）当应力和衰减系数都达到峰值时，就形成了一个主裂缝，并且在煤和岩体内部发生的破坏最为严重；（c）在0.13秒形成主裂纹通道，能量消耗在0.18秒达到峰值，能量与应力之间呈负线性关系。因此，
京公网安备 11010802027423号