城市浅埋隧道的爆破减振研究

Reducing blasting vibration of shallow tunnels in the urban area

以武汉市地铁二号线宝通寺车站过街隧道为工程背景,通过数值模拟方法研究爆破前人工开挖上导洞的施工方式对受控混凝土管道爆破振动速度的影响,以判断该种开挖方式减振的可行性。结果表明,与没有上导洞的情况相比,有上导洞时监测平面上的质点振动速度最大值降低了53.7%;两种开挖方式下,受控管道的振动速度最大值出现在不同位置,导致管道受损最严重的部位也不同。数值计算结果为爆破减振设计提供参考,保证了施工过程中地下管线的安全性。

Based on the underpass tunnel project at Wuhan Baotongsi subway station, the bench con- structing method and its influence on the blasting vibration velocity of the concrete pipe were dis- cussed by numerical simulation, and the vibration-reducing effect of the method was analyzed. The results show that, compared with the method without bench constructing, the maximum node veloci- ty of the concrete pipe has decreased by 53.7%. It is also found that, with the two different construc- ting methods, the maximum velocity nodes are not in the same position, so the worst damage parts of the pipe are also different. The numerical simulation results provide references for vibration-reducing blasting design and ensure the safety of the shallow tunnel during construction.