浅埋隧道爆破开挖与控制技术研究

Blasting Excavation and Control Technology of Shallow Buried Tunnel

以110辅路应急线工程衮天沟隧道为背景工程,对隧道浅埋段爆破设计和爆破振动监测进行了研究。通过分析爆破振动监测结果,验证了施工工法的合理性,并提出了有效的爆破振动控制技术。同时,分析结果表明:(1)采用三台阶法施工,可以有效控制爆破破岩效果与振动危害;(2)地表监测点主振频率随着距离的增加而减少的趋势并不明显;(3)隧道出口地表振动速度衰减规律为V=9 682(3槡Q/R)2.942,以此可以有效控制隧道爆破对毗邻复杂环境的破坏;(4)采用精细爆破设计、信息化施工、爆破参数优化和预加固措施等综合技术措施,可确保浅埋隧道爆破施工安全。

This paper based on Guntiangou tunnel in 110 auxiliary road emergency line,researches the blasting design and vibration monitoring of shallow buried section of the tunnel. Through analyzing the results of blasting vibration monitoring,it verifies the rationality of excavation method applied,and puts forward the control technology of blasting vibration. And then,the analysis shows that:( 1) Using three bench excavation method,can effectively control the effect of rock blasting and vibration hazards;( 2) When the distance decreases,the increased trend of vibration frequency of surface monitoring points is not obvious;( 3) The attenuation rule of ground vibration velocity of the tunnel exit is V =9 682(3槡Q / R)2. 942,it can effectively control the destruction of tunnel blasting to adjacent environment;( 4) we put forward the comprehensive technical measures,such as refined blasting design,informational construction,optimization of blasting parameters,advanced reinforcing measure and so on,to ensure the construction safety of shallow tunnel.