摘要
利用钻爆法开挖山区双线隧道时,后行隧道施工会不可避免地产生不利的振动效应,从而影响到先行隧道的安全稳定。相邻隧道爆破的振动测试与分析,对双线隧道的安全施工有着重要意义。本文以兴延高速公路浇花峪双线隧道工程为背景,对隧道轴线进行了现场振动测试,得出了以下结论:①相邻隧道测试区域内三方向振动强度大小依次为垂直方向、水平径向、水平轴向;随着爆心距的增加,三方向间的振动强度差异逐渐减小。②掏槽炮孔的夹制作用最大,同时爆破振动强度亦最大。③不同类型炮孔爆破振动波形都存在迅速从初始值上升至振速峰值,而衰减过程相对较慢的现象,且这种现象在掏槽孔爆破时尤其明显。④在双线隧道爆破施工时,降低掏槽孔的最大单段药量、增加雷管段别、分解隧道开挖断面、控制爆破规模等是减小爆破振动的有效方式。
When the two-lane tunnel in the mountainous area is excavated by the drilling and blasting method,the construction of the rear tunnel will inevitably produce unfavorable vibration effects,thus affecting the safety and stability of the preceding tunnel.Therefore,the vibration test and analysis of adjacent tunnel blasting is of great significance for the safe construction of double-line tunnels.In this paper,based on the two-line tunnel project of the Xingyan Expressway,the following conclusions ard drawn by conducting on-site vibration tests on its tunnel axis:①The relationship between the three directions of vibration intensity in the adjacent tunnel test area is:vertical direction>horizontal radial>horizontal axis,and the size relationship is relatively fixed.As the blasting distance increases,the difference in vibration intensity between the three directions gradually decreases.②The clamping of cutting hole is the biggest and the blasting vibration intensity is the biggest.③The blasting vibration waveforms of different types of blastholes have a phenomenon of rapidly increasing from the initial value to the peak value of the vibration velocity,and the attenuation process is relatively slow,and this phenomenon is particularly noticeable in the blasting of the cut hole.④In the double-line tunnel blasting construction,reducing the maximum single-stage dose of the cut hole,increasing the detonator section,decomposing the tunnel excavation section,and controlling the blasting scale are effective ways to reduce the blasting vibration.
作者
贾海鹏
刘殿书
陈斌
侯仕军
邓丽梅
杨瑞
田帅康
Jia Haipeng;Liu Dianshu;Chen Bin;Hou Shijun;Deng Limei;Yang Rui;Tian Shuaikang(School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing100083,China;Hohhot City Hongyang Real Estate Co.LTD,Hohhot Inner Mongolia010020,China)
出处
《矿业科学学报》
2019年第6期506-514,共9页
Journal of Mining Science and Technology
基金
国家自然科学基金(10272109)
国家教育部高等学校博士学科点专项科研基金(20060290009)
中央高校基本科研业务费专项资金(2010QL05)
关键词
隧道开挖
振动测试
波形分析
降振措施
tunnel excavation
vibration test
waveform analysis
vibration reduction measures
