广州地铁三号线连拱隧道微震爆破设计

要在密集的建筑群和广州地铁一号线的地下,进行隧道爆破开挖施工,只有采用微震控制爆破技术才能使地表建筑物免受爆破震动的危害.介绍广州地铁三号线体育西站的钻爆施工的设计、爆破控制、震动监测等内容,采取闭合双回路孔内外延期非电微差起爆技术,严格控制最大一段起爆药量,并采取有效的安全技术措施,隧道拱部采用光面爆破,墙部采用预裂爆破,核心掏槽采用抛掷爆破的综合微震控制爆破技术,以尽可能减轻对围岩和周围构筑物的扰动,维护围岩自身稳定性,达到良好的轮廓成形.经过监测爆破达到了预期效果,未造成危害.

Design of Slight Vibration Blasting for Buried Excavation for No Multiple-arch Tunnel in Guangzhou

The application of slight vibration controlled blasting in buried excavating multiple-arch tunnel under complicated situation of near buildings in the Guangzhou city is introduced. According to the characteristics and envi- ronment of the project through optimum selected appreciative parameters of slight vibration controlled blasting. The methods such as using a closed blasting network of in-hole and out-hole millisecond delay, controlling the every delayed,detonating change and taking effective safety operations, using smooth surface blasting on the arch and pre- splitting blasting on the sidewall and casting blasting in the core soil, were adopted to reduce vibration of the surrounding rock mass and the buildings. The blasted flying rocks and blasting vibration were controlled successfully.