隧道爆破振动对周边建筑物振动影响及减振措施研究

对城万快速公路通道某隧道出口临近建筑物爆破振动速度进行监测,结果表明:隧道临近建筑的垂直振速大于径向振速和切向振速,应以监测其垂直振速为主;山区建筑物大多依山而建,其后的挡土墙或土台阶可以削弱隧道爆破振动对房屋的破坏,起到隔振作用,尤其是当台阶高度大于0.5m时,其隔振效果明显增强;增设隔振沟、采用微差起爆可以起到减振作用。

Research on Vibration and Antivibration which Blasting Vibration Imposed on Building Near to Tunnel

Multiple experiments are done and blasting vibration velocity of buildings near to tunnel are monitored,the tunnel is in Chengkou-Wanyuan fast-entryway.The following results are gained: the vertical vibration velocity around building near to tunnel is far bigger than that of radial and tangential velocity.So,vertical vibration velocity monitoring is enough.Most of buildings in mountain area are build near to mountain,the impaction which blasting imposed on building is reduced by the soil step or retaining wall,when the height is bigger than 0.5 meter,effect of vibration isolation is obvious,when the vibration isolation gap is set and short-delay blasting is adopted,the vibration isolation is much bigger.