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聚能装药爆破的动态效应及其在提高煤层渗透率中的应用

Dynamic Effect of Shaped Charge Blasting and Its Application in Coal Seam Permeability Enhancement.

作者信息

Li Xiangshang, Si Kai, He Tuan, Li Chunyuan

机构信息

Chinese Institute of Coal Science, China Coal Technology Engineering Group, Beijing 100013, P. R. China.

School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, P. R. China.

出版信息

ACS Omega. 2022 Jul 14;7(29):25353-25365. doi: 10.1021/acsomega.2c02329. eCollection 2022 Jul 26.

DOI:10.1021/acsomega.2c02329
PMID:35910146
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9330100/
Abstract

The dynamic effect of shaped charge blasting and its application in coal seam permeability enhancement have been investigated. Comparative experiments of shaped charge blasting and conventional blasting to fracture the concrete are carried out. Then, the propagation characteristics of explosion stress waves under shaped charge blasting and conventional blasting are analyzed by ANSYS/LS-DYNA. Finally, the fracture mechanical model of shaped charge blasting is established. The experimental results show that the width of the four main cracks formed after conventional blasting is 0.3 cm, while the width of the cracks in the energy accumulation direction after shaped charge blasting is 1.1 cm and the width of that in the vertical energy accumulation direction is 0.4 cm. The numerical simulation results show that the crushing area after shaped charge blasting is "dumbbell type", and the area is smaller than that of conventional blasting. However, the cracking area is "spindle type", and the development of the fracture degree is better than that of conventional blasting. In addition, shaped charge blasting is used to improve the permeability of coal seams. The results show that shaped charge blasting effectively improves the permeability and gas extraction rate of coal seams.

摘要

研究了聚能装药爆破的动态效应及其在提高煤层渗透率方面的应用。进行了聚能装药爆破与传统爆破破碎混凝土的对比试验。然后，利用ANSYS/LS-DYNA分析了聚能装药爆破和传统爆破下爆炸应力波的传播特性。最后，建立了聚能装药爆破的断裂力学模型。实验结果表明，传统爆破后形成的四条主要裂缝宽度为0.3厘米，而聚能装药爆破后在能量积聚方向上的裂缝宽度为1.1厘米，在垂直于能量积聚方向上的裂缝宽度为0.4厘米。数值模拟结果表明，聚能装药爆破后的破碎区域呈“哑铃型”，且面积小于传统爆破。然而，裂缝区域呈“纺锤型”，断裂程度的发展优于传统爆破。此外，采用聚能装药爆破提高煤层渗透率。结果表明，聚能装药爆破有效地提高了煤层的渗透率和瓦斯抽采率。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d9c0/9330100/174cd538788f/ao2c02329_0014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d9c0/9330100/01201c730167/ao2c02329_0006.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d9c0/9330100/c311c1ec22d2/ao2c02329_0008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d9c0/9330100/174cd538788f/ao2c02329_0014.jpg

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