Primary Ignition Blasting of Chimney Base under the Complex Environment

The blasting method was introduced to dig the chimney base in a new steel plant with blasting volume is 3 858 m3.The blasting zone was in the factory area with complex environment.In this research,the disperse distance of the blasted rocks and the blasting vibration were controlled effectively by optimizing the drilling parameters,the powder factor,the interval charge of blasting,blasting network and initiation sequence.In addition,the blasting of foundation pit was finished by primary ignition,which guaranteed the satisfactory blasting effect as well as the safety of buildings and facilities near the blasting zone.