高层建筑物爆破拆除中震动的测试及分析

在十八层楼房爆破拆除中 ,利用GDQJ-1A地震强度计测定了爆破震动和塌落震动。通过滤波和积分将各测点记录的加速度值换算成速度值。测试数据的分析表明 ,高层建筑物爆破拆除过程中爆破震动引起的质点振动速度随距离的增加衰减较快 ,但塌落震动衰减较慢 ;震动持续时间随距离增加而延长 ;采用半秒延期雷管可以有效避免爆破震动的叠加。因此 ,在较近距离处 ,爆破震动是引起危害效应的主要原因 ,而在较远处 ,塌落震动则起主要作用。

MEASUREMENT AND ANALYSIS OF VIBRATION IN BLASTING DEMOLITION OF A HIGHRISE BUILDING

During a 18-storeyed building was demolished by blasting method,the vibrations from blasting and building collapse were measured by use of a GDQJ-1A scale of seismic intensity.Through filtration and integration,the acceleration values recorded on measuring points were converted into velocity values.The analysis on measured data shows that the attenuation of blasting vibration amplitude is rapider than that of collapse vibration with increase of the distance between blasting center and a measure point,the period of attenuation is prolonged with the distance,and half-second delay detonators are suitable for avoiding the superposition of blasting vibration amplitude.So,the blasting vibration is main cause for the damage of structures near to blasting area while the collapse vibration is main cause for the damage of structures at a distance.