铁道标准设计2017，Vol.61Issue(8)：90-95,6.DOI:10.13238/j.issn.1004-2954.2017.08.019
基于最佳减震原则的新建隧道对既有隧道微差间隔研究
Study on Difference Interval between New Tunnel and Existing Tunnel Based on Optimal Damping Principle
摘要
Abstract
With reference to the new Gala mountain tunnel drilling and blasting construction, this paper establishes a three-dimensional numerical model of millisecond blasting with ANSYS / LS-DYNA for newly constructed tunnel. The dynamic responses of the existing tunnel caused by different time intervals of three-stage explosives are simulated. The vibration velocity time-history curves of the maximum velocity points of the secondary lining particles of the existing tunnels are obtained by means of millisecond blasting in different time intervals. The results show that when the total explosives for the new tunnel blasting are divided into three sections of equal interval, the actions of the explosives in different sections are staggered in time and space to create new free surface so as to achieve with good results in damping and rock breaking. The maximum vibration velocity point appears on the sidewall of the existing tunnel, and with the increasing of the interval, the starting time of peak velocity on the secondary lining of the tunnel is delayed. When the total charges are the same, the millisecond blasting can effectively reduce the influence of blasting vibration on the existing tunnel compared with the instantaneous initiation, and the damping effects are different in different intervals. Compared with the instantaneous initiation, the peak amplitude of the three-stage interval is reduced by 63. 1%. When the initiation interval is more than 20 ms, the effect of each explosive blasting on the existing tunnel is independent, and the peak value of vibration velocity converges to the peak value of the vibration velocity caused by a single blasting.关键词
公路隧道/钻爆法/微差爆破/瞬时起爆/既有隧道/动力响应Key words
Highway tunnel/Drilling and blasting method/Millisecond blasting/Instantaneous initiation/Existing tunnel/Dynamic response分类
交通工程引用本文复制引用
张洋,王志杰,赵启超,周平,徐海岩,鲜一丁..基于最佳减震原则的新建隧道对既有隧道微差间隔研究[J].铁道标准设计,2017,61(8):90-95,6.基金项目
中央高校基本科研业务专项资金资助(SWJTU11ZT33) （SWJTU11ZT33）
教育部创新团队发展计划资助(IRT0955) （IRT0955）
