Vibration Superposition in Tunnel Blasting with Millisecond Delay  

作　　者：郑俊杰 楼晓明 罗德丕 

机构地区：[1]Institute of Geotechnical and Underground Engineering,Huazhong University of Science and Technology

出　　处：《Journal of Southwest Jiaotong University(English Edition)》2009年第1期42-46,共5页西南交通大学学报（英文版）

基　　金：The Programme for New Century Excel-lent Talents in University (No.NCET-06-0649);the Natural Science Foundation of Hubei Province(No.2005ABA303)

摘　　要：According to explosion dynamics and elastic wave theory, the models of particle vibration velocity for simultaneous blasting and milliseeond blasting are built. In the models, influential factors such as delay interval and charge quantity, are considered. The calculated vibration velocity is compared with the field test results, which shows that the theoretical values are close to the experimental ones. Meanwhile, the particle vibration velocity decreases quickly with time due to the damping of rock mass and has a harmonic motion, and the particle vibration velocity of millisecond blasting has short interval. The superposition of particle vibration velocities may reduce vibration because of wave interference, or magnify the surrounding rock response to the blastinginduced vibration.According to explosion dynamics and elastic wave theory, the models of particle vibration velocity for simultaneous blasting and milliseeond blasting are built. In the models, influential factors such as delay interval and charge quantity, are considered. The calculated vibration velocity is compared with the field test results, which shows that the theoretical values are close to the experimental ones. Meanwhile, the particle vibration velocity decreases quickly with time due to the damping of rock mass and has a harmonic motion, and the particle vibration velocity of millisecond blasting has short interval. The superposition of particle vibration velocities may reduce vibration because of wave interference, or magnify the surrounding rock response to the blastinginduced vibration.

关 键 词：Tunnel blasting Millisecond blasting Vibration velocity SUPERPOSITION 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]