马跃原,何宏海,张勇,铁继康,刘国锋,江伟,高启栋

• 1:中交第一航务工程局有限公司
• 2:长安大学公路学院

摘要(Abstract)：

在小净距大断面隧道后行洞爆破开挖过程中，如何保证先行洞的爆破振动安全极为关键。以京秦高速双向六车道小峪隧道为工程依托，监测分析了后行洞开挖过程中先行洞纵、横断面的爆破振动速度分布规律；依据爆破振动跟踪监测结果，动态调整优化后行洞的爆破设计参数，并提出了相应的爆破振动安全控制措施。结果表明：小净距隧道后行洞开挖时，先行洞边墙径向振动的速度最大，且主要由掏槽孔爆破引起，垂直向振速略低于切向振速，但二者差别不大，爆破振动能量主要集中在30～100 Hz频段；对于先行洞纵断面上的振动分布，峰值振速总体随爆心距衰减，衰减速率也随之降低；未开挖方向的振速相对较高，约为同等距离已开挖向振速的1.2～1.6倍；对于先行洞横断面上的振速分布，迎爆侧的振速明显高于背爆侧，其中边墙部位迎爆侧振速可达背爆侧的5～10倍；现场针对爆源采用多级复式掏槽，优化炮孔分布，雷管段别增加至12段来减少相应的单段药量，以及增大起爆间隔至60 ms来等措施控制爆破振动，现场实践表明，优化后的爆破设计可使先行洞边墙振速降低约50%。

关键词(KeyWords)： 小净距隧道;先行洞;爆破振动;分布规律;安全控制

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 马跃原,何宏海,张勇,铁继康,刘国锋,江伟,高启栋

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