铁路隧道爆破对临近特高压铁塔的振动影响研究

Study on the Vibration Effect of Railway Tunnel Blasting on the Adjacent High Voltage(UHV)Iron Tower

为研究隧道爆破开挖对临近既有特高压铁塔的影响,本文采用现场试验和数值模拟相结合的方法,对铁塔塔基的振动速度进行研究,并且详细讨论了爆心距与振动速度峰值的关系。通过数据拟合,得出本工程条件下隧道爆破质点的振动传播规律及衰减公式。结果表明:塔基的振动速度峰值随爆源与塔基距离的接近而增大,在爆心距为0 m时出现最大振速;竖直方向的振速普遍高于水平方向的振速;三座铁塔最大轴应力均出现在塔基处,最大轴应力随铁塔高度的增加而逐渐减小。数值模拟结果与现场试验结果相近,研究可为实际工程提供参考依据。

In order to study the impact of tunnel blasting excavation on the adjacent high voltage(UHV)iron tower,the vibration velocity of the tower foundation was studied by combining field test and numerical simulation,and the re-lationship between the blast center distance and the peak vibration velocity was discussed in detail.Through data fit-ting,the propagation law and attenuation formula of tunnel blasting particle vibration under the engineering conditions were obtained.The results showed that the peak vibration velocity of the tower base increased with the distance be-tween the explosion source and the tower base,and the maximum vibration velocity occurred when the explosion center distance was 0 m;The vibration velocity in the vertical direction was generally higher than that in the horizontal direc-tion;The maximum axial stress of the three towers was at the tower base,and the maximum axial stress decreased grad-ually with the increase of tower height.The numerical simulation results were close to the field test results,and the re-search can provide reference for the actual project.