岩土力学2012,Vol.33Issue(12):3747-3752,3759,7.
超小净距隧道爆破振动现场监测及动力响应分析研究
Field monitoring on blasting vibration and dynamic response of ultra-small spacing tunnels
摘要
Abstract
Based on the background of ultra-small spacing tunnels of Nanjing Metro and combined with the existing research results as well as domestic and international codes, a method of blasting technology using in small spacing later tunnel is studied in order to keep the security and stability of the antecedent line. Using modern information technology theory as the basis and making full use of on-site monitoring, the vibration velocity of particle in antecedent tunnel can be monitored and analyzed for vibration reduction and vibration isolation during the blasting. The final results show that the blasting design parameters such as optimized footage driving cycle, the maximum loading dose and the time difference of sectional blasting are reasonable during the construction. The blasting design did not affect the safety of the antecedent tunnel. While through the three dimensional numerical simulation, after observing the variation of particle vibration in antecedent line over time, we find that the maximum vibration velocity meets the relevant codes; and the optimized blasting design is reasonable. Through numerical analysis, we find that the tangential and centripetal vibration velocity in tunnel side wall are much faster than the vibration velocity in arch springing, the effect in antecedent blasting surface is slight greater than the rear lining; and the surface vibration of lining in left tunnel which near blasting point is greater than the surface in blasting point. The research results to the construction of this protect provide a scientific basis and technical guidance for similar future tunnel blasting excavation engineering and construction methods in theory.关键词
隧道工程/小净距隧道/爆破监测/数值模拟Key words
tunnel engineering/ small spacing tunnels/ blast monitoring/ numerical simulation分类
建筑与水利引用本文复制引用
朱正国,孙明路,朱永全,孙星亮..超小净距隧道爆破振动现场监测及动力响应分析研究[J].岩土力学,2012,33(12):3747-3752,3759,7.基金项目
国家自然基金(No.51078243) (No.51078243)
河北省自然基金资助项目(No.E2012210011). (No.E2012210011)