复杂环境下烟囱基础一次点火开挖爆破

摘要

某钢厂有一烟囱基础需采用爆破法开挖,爆破方量为3 858m3.爆破区域位于环境复杂的厂区内.通过选择合适的孔网参数、炸药单耗、单响药量、爆破网路和起爆顺序,使爆破飞石的飞散距离和爆破震动得到有效控制,并且一次点火完成整个基坑的石方爆破工作,保证了爆区周围建筑物和设施的安全,取得了较好的爆破效果.%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.