隧道掘进爆破时掌子面前方开挖段的地表振速预测

将掏槽孔的爆破简化为一系列球形药包的爆破.通过复变函数中的保角变换,将爆破点与隧道挖空段的拱顶映射到复平面的同一侧,即可将隧道挖空段的地表振动问题转化为半空间中的地表振动问题,最终得出隧道挖空段地表振速的计算方法.最后,通过实际工程,对比理论计算和实际监测的隧道轴线地表质点的振速峰值分布情况.结果表明:验证理论计算的可行性.

Prediction of Ground Vibration Velocity of Excavation Sectionin Front of Face of Tunnel During Tunnel Excavation Blasting

The blasting of cut holes is simplified to a series of spherical charge blasting. By means of conformal transformation in the complex function, the blasting point and the vault of the tunnel hollow-out section are mapped to the same side of the complex plane, the surface vibration problem of the tunnel hollow-out section can be transformed into the surface vibration problem of half space, and finally the calculation method of the surface vibration velocity of the tunnel hollow-out section can be obtained. Through practical engineering, the actual monitoring distribution of peak vibration velocity of tunnel axis surface particle is compared with the theoretical distribution. The results show that the theoretical calculation method is feasible.