隧道爆破振动对古建筑影响的试验研究

Experimental Study for the Effect of Tunnel Blasting Vibration on Ancient Buildings

结合南京地铁四号线鼓楼站区间隧道爆破开挖工程,通过现场试验的方法,得到了适用于现场地质条件下的三个方向上的萨道夫斯基预测公式,为爆破开挖设计提供参考。结果表明:地表质点垂直方向振动速度峰值距离爆源近时,比两个水平方向振动速度峰值大,远处时则最小;且在30 m内迅速衰减。鼓楼城阙垂直方向的振动速度峰值最大,碑楼水平方向的振动速度峰值最大,振动速度峰值随着药量增加总体上呈现增加,采取微差爆破可有效减小振动速度峰值。

According to the engineering practice of Nanjing metro line 4 Gulou station interval tunnel which are excavated by blasting,the Sadowski prediction formula in three directions was obtained which adopts filed geological conditions by filed test,and provided a reference value for the blasting design.The results show that the peak velocity of the vibration in the vertical direction of the surface is larger than that in the two horizontal directions in short distance and decreases quickly in 30 m,which is smallest in long distance.The largest peak velocity of the vibration is in vertical direction in Chengque and in horizontal direction in Beilou.The peak velocity of the vibration increases with the increase of explosive charge,which can be reduced by taking millisecond blasting technology.