地下浅孔爆破对地表结构振动特征的影响分析

Analysis of the effect of underground shallow hole blasting on the vibration characteristics of surface structures

为研究地下浅孔爆破对地表既有结构关键振动特征的影响,采用CBSD-VM-M01型网络测振仪对爆破周边地表环境进行振动监测,分析了地下浅孔爆破对地表既有结构水平径向(x向)、水平切向(y向)、铅直方向(z向)等3个方向的振动特征,基于萨道夫斯基经验公式,使用最小二乘法对监测数据进行回归拟合。结果表明:3个方向的振动速度衰减在爆心距较近区域随爆心距的增大而表现明显,较远区域则体现出衰减缓慢的特点,其中铅直方向振动速度衰减最为明显。主振频率主要集中在10~75 Hz之间;采用最小二乘法对3个方向上的振动速度经验公式进行拟合,较好的描述了3个方向振速的衰减规律,可为类似工程提供参考。

In order to study the impact of underground shallow hole blasting on the key vibration characteristics of the existing structure on the surface,CBSD-VM-M01 network vibrometer was used to monitor the vibration of the surface environment around the blasting,and the impact of the shallow hole blasting on the horizontal diameter of the existing structure on the surface was analyzed.The vibration characteristics in three directions:x-direction,horizontal tangential y-direction,and vertical z-direction,are based on Sadowski′s empirical formula and use the least square method to regression fit the monitoring data.The results show that the attenuation of the vibration velocity in the three directions is obvious with the increase of the burst center distance in the nearer area of the burst center distance,while the far area shows the characteristics of slow attenuation,and the vertical direction vibration velocity attenuation is the most obvious.The main vibration frequency is mainly concentrated in the range of 10-75 Hz,the least squares method is used to fit the empirical formula of the vibration velocity in three directions,which better describes the attenuation law of the vibration velocity in the three directions,which can provide reference for similar projects value.