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

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

Blog Article

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 click here 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, click here which show a good control effect on thick-hard roof seams.