厦门云顶隧道爆破监测与分析

通过对厦门市云顶隧道爆破振动的监测与分析,确定了爆破振动引起的地表质点振动速度峰值与比例药量之间的经验公式。得出了地表质点振动主振频率主要集中在低频段;当存在一定厚度的表土层时,主振频率随距离的增加而减小的趋势并不明显;总体上存在主振频率随距离的增加而往下降的态势;不同距离的振动速度主频呈现出不同的分布趋势,同时,不同距离的振动速度主频表现出分布范围的集中程度不同。笔者提出了沿垂直方向、水平径向和水平切向振动时不同距离地震波衰减规律的经验公式。

Monitoring and Analysis of Blasting at Yunding Tunnel in Xiamen

The blast vibration was monitored and the data from Yunding Tunnel in Xiamen were analyzed. The empirical formula of the relation between the peak value of vibration velocity at surface mass point and the scaled explosive charge was determined. The dominating vibration frequency at surface mass point mostly focused on low frequency. When the earth surface covered with soil of certain thickness, the decreasing tendency of dominating vibration frequency at surface mass point when the distance increased was not obvious, however, as a whole the dominating frequency lowered as the distance increased. There was a distribution trend of different dominating frequencies at different distances. At the same time, the convergence of the vibration velocity dominating frequency was different at different distances. An empirical formula was derived, which indicated the attenuation of the seismic waves at different distances along the vertical, horizontal and horizontal tangential directions.