A Case Study of Cyclic Top Coal Weakening Process Based on Highly Tough Coal Seam with Partings

The top coal weakening process is an effective mean to increase the coal output, reduce the coal resource waste, and promote the sustainable development in a mine. The conventional blast weakening process and water injection weakening process are more widely applied in fully mechanized caving mining...

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Bibliographic Details
Published inShock and vibration Vol. 2021; no. 1
Main Authors Wu, Zhaopeng, Wang, Junhui, Wan, Zhijun, Cheng, Jingyi, Xiong, Luchang, Zhao, Lizhu, Liu, Xiaogang
Format Journal Article
LanguageEnglish
Published Cairo Hindawi 2021
John Wiley & Sons, Inc
Hindawi Limited
Subjects
Case studies
Coal industry
Coal mines
Coal mining
Design
Efficiency
Gas explosions
Geology
Simulation
Sustainable development
Underground explosions
Water flooding
Water injection
China
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Summary:The top coal weakening process is an effective mean to increase the coal output, reduce the coal resource waste, and promote the sustainable development in a mine. The conventional blast weakening process and water injection weakening process are more widely applied in fully mechanized caving mining of hard thick coal seams, but under some special complex geological conditions, no desirable performance has been achieved in top coal weakening by one weakening process alone after substantial investment in capital and equipment. In the context of highly tough top coal with partings at working face 110501 for fully mechanized top coal caving mining in Yushutian Coal Mine, effects of parting band and high toughness on top coal breaking were studied in terms of mechanism and extent, a multifunctional compound drilling field integrating blast weakening, water injection weakening, and gas extraction was purposefully designed, and a cyclic top coal weakening process for highly tough coal seams with partings was proposed. Engineering practice and performance testing show that degree of fragmentation and mobility of top coal was improved, mean top coal recovery ratio at the working face increased by about 35%, coal resource waste decreased, and potential risks of gas explosion and mine fire were eliminated, which provides reference for top coal weakening process under similarly complex engineering conditions.
ISSN:1070-9622
1875-9203
DOI:10.1155/2021/8862044