摘要
结合北京一地铁隧道爆破开挖工程,利用ANSYS/LS-DYNA动力有限元软件模拟爆破现场两个相邻炮孔在不同延时时间下的应力波叠加情况,研究逐孔起爆的振动累积效应,得到数码电子雷管降低爆破振动最佳的延时时间,并与现场爆破试验进行了对比。结果表明:在该工程地质条件下,孔间延时时间7 ms起爆时降振效果最明显。在北京地铁16号线08标段的隧道爆破施工中采用这一延时时间,将爆破振动控制在允许范围内。
In the background of Beijing subway tunnel blasting excavation engineering,the stress wave superimposition condition of two adjacent hole under different delay times on blasting spot was simulated by dynamic finite element software ANSYS/LS-DYNA for analyzing the blasting vibration cumulative effects of hole by hole and obtained the optimal delay time of digital electronic detonator for blasting vibration-reducing.The calculation results were compared with those obtained from the field blasting test.The results showed that the hole spacing delay time at7 ms was the most obvious effect of blasting vibration-reducing in this engineering geological condition.Finally the delay time was applied in the blasting construction of tunnel at 08 section on No.16 Metro Line in Beijing,the blasting vibration velocity is controlled in the safety limit.
出处
《铁道建筑》
北大核心
2016年第1期38-42,共5页
Railway Engineering
基金
中国铁道科学研究院基金项目(2014YJ028)
关键词
浅埋隧道
数值模拟
电子雷管
延时时间
现场试验
Shallow-buried tunnel
Numerical simulation
Electronic detonator
Delay time
Field test
