摘要
基于小净间距的南方某公路隧道二期工程爆破震动安全监测,通过爆破震动作用隧道围岩与衬砌质点振动速度波频谱分析与质点振动速度幅值分布情况,对公路隧道混凝土衬砌及其围岩在爆破地震波作用下的力学性质特征进行论述,指导和优化爆破施工,为合理与有效保护隧道衬砌提供依据。
Based on monitoring of blasting vibration safety of the 2nd term engineering for a tunnel in Shengzhen city, which is a newly excavated tunnel close to the existing one on the condition of small clear spacing. Blasting vibration analysis of concrete lining tunnel is described by analyzing the peak particle velocity（PPV） and its main frequency. First, it is mentioned how to settle monitoring line and position according the principles, which are the principles of the position and direction of the maximum PPV, the principle of monitoring of blasting seismic effects, and the principle of the blasting vibration waves decay. Then, the information and results of monitoring are given, in which results of blasting vibration velocity monitoring of different blasting methods are emphasized, and the attenuation formula of the PPV and explosives with distance between blasting center and monitoring position are obtained, and that the V-p relationship of blasting vibration is pointed out too. The results show that the maximum PPV appeared in radial direction and the position of the minimum distance between blasting center and monitoring position, and appeared in the center point of wall and the apex of arch in same section, and the main frequency is focused on 15-75 Hz which differs from various concrete linings, mainly 22-50 Hz. Finally, it is pointed out by analysis and discussion of the PPV and its main frequency of three kinds of blasting methods, which are semi-face blasting and bench stopping blasting and full-face blasting, that the PPV and its main frequency have close relation with explosive mode and distance between blasting center and monitoring position, and that degree of blasting seismic effects is affected mainly by distance and degree of blasting, and that full-face blasting is the best blasting method to control the blasting seismic effects.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A02期5803-5807,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
湖南省2002年科技计划项目(02GKY3105)
关键词
隧道工程
爆破震动
动力特性
tunneling engineering
blasting vibration
dynamic characteristics
