阳生权,周健,李雪健
YANG Sheng-quan~(1,2),ZHOU Jian~2,LI Xue-jian~3 (College of Civil Eng.,Hunan Univ.of Sci.& Tech.,Xiangtan 411201,Hunan,China;2.College of Civil Eng.,Tongji Univ.,Shanghai 200092,China;3.Road & Bridge Consulting Supervision Co.of Xiamen,Xiamen 361012,Fujian,China)

• 1:湖南科技大学土木工程学院
• 2:同济大学土木工程学院
• 3:厦门市路桥咨询监理有限公司 湖南湘潭411201
• 4:同济大学土木工程学院

摘要(Abstract)：

基于小净距的南方某公路隧道二期工程爆破震动安全监测,通过质点振动速度峰值与主振频率分析,展开了基于小净距公路隧道的爆破震动观测与研究。首先介绍了测线与测点布置原则,并阐述了爆破震动观测及其结果,得出了相应的质点振动速度峰值衰减经验公式及v-ρ关系曲线。结果表明,半断面、下上台阶和全断面爆破等三种不同隧道施工开挖方式所得出的不同的观测结果,质点振动速度峰值最大值通常出现在同一断面的墙中与顶板位置、径向方向和爆心距最小位置发生处,对应主频分布在15⁷5Hz,主要集中在2275Hz,主要集中在22⁵0Hz。结论指出,质点振动速度峰值与对应主振频率与爆破方式以及爆心距密切相关,爆破规模与爆心距对爆破地震效应影响程度很大,隧道开挖中的全断面爆破有利于减小和控制爆破震动。
The monitoring analyzation of blasting vibration was regarding an excavation of a new tunnel under a road close to an old one in little-space involved in the 2nd term engineering of road tunnel excavation and was conducted through analyzing the PPV of blasting vibration and its main frequency.The present paper introduced the principles of how to determine the monitoring points and lines together with observation information and results.A attenuation formula of PPV of blasting vibration and v-ρ correlation curve were obtained.The curve showed that the maximum peak values of blasting vibration velocity appeared frequently at the point where the apex of arch in same section,the radial direction and the blasting center were in the minimum distance in between,with the main frequency falling into 15～75Hz,dominantly into 22～50Hz.The outcome indicated that,the peak value of PPV and its corresponding main vibration frequency were closely correlated with the blasting method and blasting center distance,and tnat,blasting ability and blasting center distance had great influence on blasting seismic effects.And as a result,full-face blasting was the best blasting method in terms of controlling the blasting seismic effects.

关键词(KeyWords)： 小净距;公路隧道;爆破震动;频幅特性
Little space;Road tunnel;Blasting vibration;Amplitude and frequency characteristics

Abstract:

Keywords:

基金项目(Foundation): 2005年湖南省自然科学基金资助项目——岩石破裂过程中的累积损伤(05JJ30001)

作者(Authors): 阳生权,周健,李雪健
YANG Sheng-quan~(1,2),ZHOU Jian~2,LI Xue-jian~3 (College of Civil Eng.,Hunan Univ.of Sci.& Tech.,Xiangtan 411201,Hunan,China;2.College of Civil Eng.,Tongji Univ.,Shanghai 200092,China;3.Road & Bridge Consulting Supervision Co.of Xiamen,Xiamen 361012,Fujian,China)

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