地铁隧道掘进爆破地表振动效应研究

以武汉地铁2号线隧道工程为背景,采用现场爆破振动监测及数值模拟方法,对掘进爆破过程中产生的地表振动效应进行研究。结果表明,掌子面后方沿隧道轴线已开挖区地表振动速度存在放大现象,数值计算所获得的地表振速峰值与现场监测结果吻合较好,其变化规律和特征与实测结果基本一致,证明采用数值模拟方法研究隧道掘进爆破产生的振动效应是可行的,能为后续的施工提供参考。

STUDY ON THE GROUND VIBRATION EFFECT OF METRO TUNNEL DIVING BLASTING

Taking Wuhan metro 2nd line as the background,site blasting vibration monitoring and numerical simulation method were used to study the ground vibration effects induced by its driving blasting.The results show that ground vibration velocities of cavity zone at the back of its working face were amplified along the axis,the peak values of ground vibration velocities obtained by numerical calculation coincided well with ones gained by field monitoring,and change law and character of the ground vibration velocities agreed with field monitoring results.It has been proved that using numerical simulation method to study the ground vibration effects induced by driving blasting of the tunnel is feasible.The project can offer helpful reference for subsequent blasting excavation of the tunnel.