A case study of the periodic fracture control of a thick-hard roof based on deep-hole pre-splitting blasting

• Published in: Energy exploration & exploitation Vol. 40; no. 1; pp. 279 - 301
• Main Authors: Chen, Baobao, Liu, Changyou, Wang, Bing
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.01.2022; Sage Publications Ltd; SAGE Publishing
• Subjects: Blasting; Collapse; Control equipment; Fractures; Mining accidents & safety; Parameters; Roof failures; Roofs; Seams; Splitting; Strata; Thick-hard roof; deep-hole pre-splitting blasting; collapse characteristics; controlling effect; fracture evolution
• ISSN: 0144-5987; 2048-4054
• DOI: 10.1177/01445987211036245

A thick-hard roof implies a large hanging-roof and high-frequency dynamic strata behaviour during mining, which may jeopardise personnel safety and equipment. To alleviate these hazards, deep-hole pre-splitting blasting is employed to control periodic fractures in thick-hard roof seams in Datong mining area. Based on loading and instability characteristics, a mechanical model of thick-hard roof periodic collapse is established to investigate the relationships and optimal parameters among the collapse interval, fracturing angle and support working resistance. LS-DYNA was employed to analyse the fracture evolution to determine the optimal charge parameters. The minimum weakening width and average fragmentation of the pre-split roof are obtained. Universal distinct element code simulations were used to determine the thick-hard roof collapse morphology and strata behaviour to confirm the optimal pre-splitting parameters. The deep-hole pre-splitting blasting on-site implementation reduces thick-hard roof collapse intervals, and the supports loading is verified to be safe with sufficient allowance, which show a good control effect on thick-hard roof seams.