人和场隧道掘进爆破的地震效应试验研究

Seismic Effects on Drive-blasting in Renhechang Tunnel

针对穿越立交桥的人和场隧道掘进爆破必须严格控制地表振动速度的要求,进行了爆破地震效应的现场试验。通过测量掘进爆破引起的不同位置处的地表振速波形,研究该掘进区域内的爆破地震波衰减规律,对比分析不同微差时间的振速波形的变化特征,由此确定出允许的单段最大装药量为20kg,合理的微差时间为不小于50ms。

The vibration velocity on the ground surface of the driveblasting must be strictly controlled since the Renhechang tunnel will go through under a flyover bridge. Field blasting experiments of seismic effects have been carried out. Base on the measurement of the waveforms of the ground surface vibration velocity in different locations from the blasting source, the attenuation law of seismic waves of blasting in the excavation region is studied and the variation of the waveforms of the vibration velocity in different milliseconddelay time is compared and analyzed. Hereby the permitted maximum charge quantity per one detonating period is determined to be 20 kg with a milliseconddelay time of not less than 50 ms.