城市地铁隧道爆破对邻近建筑物的影响分析

ANALYSIS ON THE INFLUENCE OF URBAN SUBWAY TUNNEL BLASTING ON ADJACENT BUILDINGS

为研究地铁隧道爆破施工对邻近砖混建筑物的振动影响,依托斜穿四层砖混结构办公楼的双线隧道,基于现场爆破振动监测技术手段,开展爆破荷载作用下多层砖混建筑物振动响应研究。结果表明:爆破地震波在多层砖混建筑物中传播时,会随建筑物高度的增加而出现振动放大现象,但不同方向上振速的放大效应又略有差别。具体表现为,切向与垂向的峰值振速会随着建筑物楼层的增加一直增大,峰值振速的极大值出现在顶楼;而径向峰值振速随建筑物楼层的增加,先增大后减小,峰值振速的极大值出现在中间楼层;同时,受楼体尺寸的影响,同一楼层的径向振速大于切向振速。此外,切向、径向与垂向振动主频整体随楼层的增加而减小,同一楼层的径向主频与切向主频相差不大,受楼体尺寸影响较小。

In order to study the influence of subway tunnel blasting construction on the vibration of adjacent brick-concrete buildings,this paper relies on the double-line tunnel that obliquely passes through the fourstory brick-concrete structure office building.Based on the field monitoring technology of blasting vibration,the vibration response of multi-story brick-concrete buildings under blasting load is studied.The results show that when the blasting seismic wave propagates in the multi-storey brick-concrete building,the vibration amplification phenomenon will occur with the increase of the building height,but the amplification effect of the vibration velocity in different directions is slightly different.The specific performance is that the tangential and vertical peak vibration velocity will increase with the increase of the building floor,and the maximum value of the peak vibration velocity appears on the top floor;the radial peak vibration velocity will increase first and then decrease with the increase of the building floor,and the maximum value of the peak vibration velocity appears in the middle floor.At the same time,affected by the size of the building,the radial vibration velocity of the same floor is greater than the tangential vibration velocity.In addition,the dominant frequencies of tangential,radial and vertical vibrations decrease with the increase of floors.The radial dominant frequency of the same floor is not much different from the tangential dominant frequency,which is less affected by the size of the building.