中国铁道科学2011，Vol.32Issue(6)：63-68,6.
爆破振动作用下既有铁路隧道结构动力响应特性
Dynamic Response Characteristics of Existing Railway Tunnel Structure Subjected to Blasting Vibration
摘要
Abstract
Based on the excavation blasting project adjacent to the top of the existing railway tunnel, the dynamic response characteristics of the existing tunnel structure subjected to blasting vibration were analyzed by field blasting tests and numerical simulation. The blasting test results indicate that the particle vertical peak vibration velocity plays a main role in blasting vibration control. When the particle vertical peak vibration velocity is predicted by the empirical formula which is based on regression analysis, the average error rate of prediction is 11. 86% for different maximum charge of single segment. The numerical simulation results indicate that the particle vertical peak vibration velocity on the foot of tunnel vertical wall is 4. 36 cm · S-1, and the particle horizontal peak vibration velocity is 3. 72 cm · S-1. The particle vertical peak vibration velocity on the tunnel vault is 4. 13 cm · S-1. They are all within the control values of safety vibration velocity. There is the inconsistence of the particle peak vibration velocity and peak effective tensile stress in the lining and surrounding rock at the junction of arch and wall, and the attenuation trends of vibration velocity are different. The correctness of numerical simulation has been proved by field test results, and the simulation results of existing tunnel structure dynamic response subjected to vibration velocity are more accurate.关键词
爆破施工/爆破振动/既有铁路隧道/围岩/衬砌结构/动力响应Key words
Blasting construction/Blasting vibration/Existing railway tunnel/Surrounding rock/Lining structure/Dynamic response分类
交通工程引用本文复制引用
蒋楠,周传波..爆破振动作用下既有铁路隧道结构动力响应特性[J].中国铁道科学,2011,32(6):63-68,6.基金项目
国家自然科学基金资助项目(41072219) （41072219）
