武汉市二七沿江商务区楼房爆破拆除塌落振动分析

为了分析高层建(构)筑物爆破拆除时塌落造成的地面振动的特征及对周边建筑物的影响大小,对武汉市二七沿江商务区19栋楼房爆破拆除中的地面振动进行了测量,并对监测点实测的数据爆破与塌落振动速度、卓越频率、傅里叶谱及反应谱特性进行分析。结果表明:高层建筑物爆破拆除中塌落振动比爆破振动影响更大,频率更低;1#楼周边为已拆除废弃空旷场地、减振措施较少,塌落振动水平分量高于竖向分量;常用的塌落振动估算公式可以更好地描述竖向振动分量,而无法描述本次幅值更大的水平分量;持续时间随距离的增加而变长;反应谱在高频段高于设计谱,但由于周边无建筑物,不会造成危害。

Analysis of collapse vibration of building blasting demolition of Er-qi riverfront business district in Wuhan

For the analysis of the characteristics of ground vibration caused by blasting demolition of high-rise buildings and the impact on the surrounding buildings,the actual measurement to the ground vibration of 19 buildings of Er-qi riverfront business district blasting demolition was carried out,and the blasting and collapse vibration velocity,peak frequency,Fourier spectrum and response spectrum of the measured data was analyzed.The results shown that collapse vibration has greater effect than blasting vibration and its frequency is lower;the horizontal component of collapse vibration velocity is higher than the vertical component around No.1 building,because it was surrounded by abandoned open space,and less vibration damping measures were taken around it;the commonly-used formulas for calculating collapse vibration can adapt to the vertical component of collapse vibration velocity,not to the horizontal component;the duration of No.1 building was getting longer with the increasing of the distance;the response spectrum is higher than the designed spectrum in high frequency band,but it won't cause damage because there is no more buildings.