隧道扩建爆破震动控制研究

Study on the Blasting Vibration in Tunnel Extension

在隧道开挖施工方法中,钻爆法掘进对地表建筑物稳定影响显著。隧道扩建是在原有隧道结构上改造扩大,在隧道扩建施工中更应该注意施工给周围环境带来的影响。根据周边建筑物情况,在确定了重庆渝中区鹅岭隧道扩建工程爆破震动效应质点允许最大振动速度的基础上,利用LS-DYNA动力有限元分析软件对该工程爆破震动进行了模拟,获得了重庆渝中区鹅岭隧道扩建工程爆破开挖过程中的最大段装药控制量,综合经验公式计算结果确定了较为合理的火工品单位体积消耗量,并提出了减小单位消耗量的方法。为类似工程在投标报价和施工组织上提供了重要的参考数据。

In the construction of tunnels,blasting excavation has a profound influence on the stability of buildings on the ground surface.Tunnel extension is carried out on basis of the old tunnel,so attention must be paid to the construction work.Blasting vibration of Eling tunnel extension project in Yuzhong District,Chongqing,is simulated by LS-DYNA,the permitted maximum vibration velocity was determined according to the peripheral condition of this project.From the analysis,the control amount of explosive was obtained.Synthesizing empirical formula and the numerical results,a more rational consumption of explosive per unit volume is determined.And the methods are proposed for reducing the explosive consumption.It can serve as reference for similar projects.