地下储库掘进爆破地表震动角度效应分析

为确定地下工程爆破掘进对地表建筑震动影响，采用TC-4850型爆破测振仪对地表周围建筑物进行实时监测。通过对振动速度监测数据与爆源距以及装药量之间的关系进行分析，研究地表振动特性及变化规律。研究结果表明:掌子面掘进前方地表振速监测数据进行拟合，相关性较好，而掘进后方则相关性较差；爆源距与掌子面在水平面投影夹角越小,监测数据相关性较强，而该夹角越大监测数据相关性较差；在掌子面后方，爆源距在水平面投影越是接近于垂直掌子面，地表振速越高，具有放大效应。

Study on angle effect of surface vibration induced by excavation blasting of underground storage

In order to determine the influence of vibration induced by excavation blasting of underground engineering on surface buildings, the TC-4850 type blasting vibration meter was used for real-time monitoring of the surface surrounding buildings. The relationship between the monitoring data of vibration velocity and the distance to explosion source, as well as the charge quantity was analyzed to study the surface vibration characteristics and change rules. The results showed that the correlation is better when fitting the monitoring data of surface vibration velocity in front of excavation at tunnel face, while the correlation behind the excavation is poor. The smaller the horizontal projection angle of tunnel face and the distance to explosion source, the stronger the correlation of monitoring data, and the larger the angle, the poorer the correlation. Behind the tunnel face, the more close to vertical face the horizontal projection of the distance to explosion source, the higher the surface vibration velocity, with an amplification effect.