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ONCE-BLASUNG EXCAVATION OF LARGE DITCH AT XISHAN MOUTH IN SHENZHEN YANTIAN HARBOUR

Xie Xuwen(Changsha Mining Research Institute,Changsha 410012)  
Once-blasting excavation of large ditch has been carried by means of out-of-hole delay detonation of Nonel detonator combined with the hole pattern of gradual-advancing excavation of dicth at Xishan Mouth in Shenzhen Yantian Harbour,and the quick and safe excavation of ditch has been obtained. This successful blasting provides a new method with high efficiency,safety and low cost for the ditch blasting in the future.
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