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从化大理石矿采用控制爆破法开采的荒料可加工成0.8～1厘米的薄板(规格达160×80×2或200×60×2厘米),尚未发现该法对荒料造成的不良影响。该法的爆破参数:抵抗线20厘米,孔径4.2厘米,孔距15厘米,孔深为层厚的0.9倍。为了保证裂缝平整地按预定切割面开裂,采用两端孔装药的间隔错位装药法。如预定切割面布置18个孔,采用单数孔装药时,在1、5、9、13、
The blocks from Conghua marble mine controlled by controlled blasting method can be processed into sheets of 0.8-1 cm in size (160 × 80 × 2 or 200 × 60 × 2 cm) without any adverse effect on the blocks. The blasting parameters of the law: resistance line 20 cm, 4.2 cm hole diameter, hole spacing 15 cm, hole depth of 0.9 times the layer thickness. In order to ensure that the cracks are cracked according to the expected cutting surface, the dislocation loading method is adopted to charge the two ends of the holes. If the scheduled cutting face layout 18 holes, with a single hole charge, at 1,5,9,13,