小间距隧道爆破振动安全影响因素分析

The Influence Factors of Small Spacing Tunnels Blasting Vibration Analysis

为分析小间距隧道爆破参数的改变对相邻隧道既有结构的影响因素以及爆破中爆破参数改变对临近隧道爆破振动的作用效果。通过对既有隧道进行振动监测并对监测数据进行分析,总结振动衰减规律,得到隧道监测质点的振动峰值主要受到爆心距、临空面、装药结构、岩性参数等因素的影响较大,同时通过优化临近隧道的开挖方式、支护方式能够有效的减小爆破监测质点的峰值振动速度。

This paper analyzes the influence of the change of the blasting parameters of the small pitch tunnel on the existing structure of the adjacent tunnel,and the effect of the blasting parameters on the blasting vibration of the adjacent tunnel. Through monitoring the vibration of the existing tunnels and the monitoring data are analyzed,finally the vibration attenuation laws are summarized. The result shows that the vibration peaks of the tunnels are mainly affected by the following factors,like burst center distance,vacant surface,charge structure and lithological parameters,And the peak vibration velocity of the blasting monitoring mass can be reduced effectively by optimizing the excavation method of the adjacent tunnels and the support style.