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以武汉地铁二号线隧道工程为背景,对爆破振动强度进行实时监测,并结合数值模拟软件计算,研究掌子面前后方地表振动特性及变化规律。结果表明:用萨道夫斯基公式对隧道掘进前方地表振速进行拟合时,相关性较好,而隧道掘进后方地表振速拟合的相关性较差。数值计算所获得的地表峰值振速变化规律及特征与现场实测结果基本一致,成形隧道对岩体整体结构的改变导致地表振速产生放大效应,使得掌子面后方已开挖区地表振速比掌子面前方相应点的振速大,因此,在确定隧道掘进爆破施工方案时,必须考虑到隧道地表振速的这种放大效应,否则很可能危及掌子面后方地表建筑物的安全。
Taking the tunnel project of Wuhan Metro Line 2 as a background, the vibration intensity of blasting was monitored in real time. The surface vibration characteristics and variation of front and back of the face were studied by numerical simulation software. The results show that the correlation is good when using the Sadowssky formula to fit the ground surface vibration speed in front of tunneling, and the correlation between the ground surface velocity fitting behind the tunneling is poor. The variation law and characteristic of the surface peak velocity obtained by numerical calculation are basically the same with the field measured results. The change of the overall structure of the rock mass caused by the shaping tunnel results in amplification effect of the surface vibration velocity, so that the surface vibration ratio Therefore, it is necessary to consider such magnification effect of tunnel surface vibration velocity when determining tunnel excavation blasting construction scheme, otherwise it is likely to endanger the safety of surface buildings behind the palm face.