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为减小南山下隧洞开挖爆破对围岩的破坏和对上部结构的影响,采用浅眼多循环、预裂爆破技术等措施,计算了线装药密度、炮孔数目、炮孔间距、炸药单耗、装药量等参数,并运用严格控制单次起爆药量、间隔装药、反向起爆和微差爆破等措施,有效控制了爆破的地震动强度,质点振动速度没有超过控制标准,实施爆破后隧道开挖轮廓整齐,对围岩扰动较小,确保了施工安全和工程质量,同时减少了超挖量及衬砌工程量,降低了造价。
In order to reduce the damage of the surrounding rock and the influence on the superstructure caused by excavation blasting of Nanshan tunnel, the measures such as shallow-hole multi-cycle and presplitting blasting were adopted to calculate the line charge density, the number of blast holes, the distance between blast holes and explosives Unit consumption, charge and other parameters, and the use of strict control of a single initiation charge, interval charge, reverse initiation and differential blasting and other measures to effectively control the blasting earthquake intensity, particle vibration velocity does not exceed the control standards, After the blasting, the profile of tunnel excavation is tidy and the disturbance to the surrounding rock is small, which ensures the construction safety and project quality, reduces the over excavation volume and lining work volume and reduces the cost.