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| Application of deep and shallow hole combined blasting technology in complex structural belt |
| Jiao Shixiong |
| Baidong Mining Datong Co., Ltd., Jinneng Holding Coal Group, Datong 037000, China |
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Abstract Aiming at the analysis of complex geological structures such as faults and igneous rock erosion zones exposed during the mining of No.8108 fully mechanized mining face in Wajinwan Mine, the lithological changes of roof and floor during the construction period were pointed out. In order to effectively crush the hard fine sandstone and siltstone, the technical scheme of deep and shallow hole combined blasting was proposed. Through scientific calculation, the specific parameters such as minimum resistance line, blasthole arrangement, single hole charge, hole sealing depth, detonation sequence and blasting number were determined, and the supplementary design scheme combined with the specific situation of the site was put forward. Practice had proved that the advance speed during the construction period was effectively improved. The expected blasting effect was achieved.
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