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Research progress on permeability improvement mechanisms and technologies of coalbed deep-hole cumulative blasting

International Journal of Coal Science & Technology 2020年第2期7卷 329-336页

作者： Deyong Guo Pengfei Lv Jiechao Zhao Chao Zhang School of Emergency Management and Safety Engineering China University of Mining and TechnologyBeijingBeijing100083China Safety Engineering College Beijing Institute of Petrochemical TechnologyBeijing102617China

Coalbed gas extraction is an important means of exploiting and utilizing gas resources,as well as a means of preventing coal mine *** view of the low gas extraction rate from coalbeds with high gas content and low permeability,a method of improving permeability through deep-hole cumulative blasting is applied to develop initial directional fractures using a jet *** the action of the blasting stress wave and detonation gas wedge,the fractures extend over a large range within the coal,thereby improving coalbed *** study focuses on the criteria of cumulative blasting-induced coalbed fracturing based on a literature review of the penetration effect of cumulative *** this basis,we summarize the coal fracturing zone,crack extension process,and the key technologies of charging and hole sealing for cumulative *** addition,the latest research progress in the optimization of field test drilling and blasting parameters for cumulative blasting is *** findings indicate that the permeability improvement mechanism of cumulative blasting could be further enhanced,and the technology and technical equipment are in urgent need of ***,development trends in the cumulative blasting permeability improvement technique are identified.

关键词： cumulative blasting Fracturing mechanism Coalbed permeability improvement Permeability improvement technology Gas extraction

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Application of slotting-pipe shaped blasting for hard-rock rapid driving

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Journal of Coal Science & Engineering(China) 2013年第2期19卷 143-146页

作者： Ren-Shu YANG Xiao-Hai ZHANG Zhao-Ran ZHANG Xiao-Sheng BAI School of Mechanics and Civil Engineering China University of Mining and Technology (Beijing) Beijing 100083 China Zhengzhong Mine of Fenxi Mining Group Lvliang 032000 China

The cumulative blasting using PVC slotting pipe was tested for rapid driving in hard-rock roadway construction. First, the outhors optimized blasting parameters on 2.2 m scheme, and did both-sides comparative experiment of the surrounding holes after the blasting success. The results show that the application of slotting tube obtains four more cut contours than the case without it. Finally we did full-section control and non-control blasting comparative experiment, the results show that the rates of half-hole marks and the non-smooth grades of the cut contours can reach 95%, hole spacing is expanded to larger than 550 mm, and 550 mm is the best under the K2 limestone conditions.

关键词： hard-rock rapid driving slotted-pipe cumulative blasting

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