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以某区间隧道平行侧穿砖混结构危楼为工程背景,采用TC4850测振仪现场实测129组爆破振动数据,对地表固定测点的爆破振动质点响应规律进行研究,将爆破振动速度沿垂直切向、水平切向与水平径向3个矢量方向进行分解,发现以下主要规律:单一炮次的最大振速出现在垂直方向的概率最大,出现在水平切向次之,出现在水平径向的概率最小,且出现在水平切向和水平径向的概率相差不大。说明在研究单一方向的爆破振动对地表建筑物的影响时,应优先选用垂直方向的振速作为分析对象。三矢量方向的主振频率无明显的变化规律,但整体随着爆心距的增加呈现减小的趋势,且减小的幅度较小。三矢量方向的主振频率主要集中在20~100 Hz之间,爆破地震波中的高频成分的衰减速度大于低频成分的衰减速度,基本上不会引起附近建筑产生结构共振现象。
Based on the engineering background of parallel crossing brick masonry buildings in a certain section of tunnel, blasting vibration data of 129 groups measured by TC4850 vibrometer were used to study the response of blasting vibrating particles at fixed measuring point. The vibration velocity of blasting vibration along vertical tangential direction , The horizontal tangential direction and the horizontal radial direction of the three vectors are decomposed, and the following main laws are found: the maximum probability of a single shot appears in the vertical direction with the highest probability, followed by the horizontal tangential direction, and the probability appears in the horizontal direction Minimum, and appear in the horizontal and horizontal tangential probability is not big difference. It shows that in studying the impact of single direction blasting vibration on the surface buildings, the vibration speed in the vertical direction should be chosen as the analysis object. The main vibration frequency of the three vector directions has no obvious variation, but the overall trend of decreasing with the increase of the burst center distance, and the decreasing amplitude is smaller. The main vibration frequencies in the three vector directions are mainly concentrated in the range of 20-100 Hz. The attenuation speed of the high frequency components in the blasting seismic waves is greater than that of the low frequency components and basically does not cause structural resonance in nearby buildings.