Characteristics of ground vibration velocity in viaduct blasting demolition
YANG Yongqiang1 HU Jinjun1 XIE Lili1, 2 WU Xinghe1
1. Key Laboratory of Earthquake Engineering and Engineering Vibration，Institute of Engineering Mechanics, CEA, Harbin 150080 China;
2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090 China
Based on the measured results, ground vibration velocity characteristics caused by blasting demolition of the viaduct was analyzed and the difference of collapsing touchdown vibration attenuation law of blasting demolition between measured results and empirical formulas was discussed. The main conclusions are as follows: the vertical component peak of ground vibration velocity is the largest, peaks of the two horizontal component are small; the peak value of ground vibration velocity of each measuring point in line 2 and line 3 is slightly larger than line 1; ground vibration is superposed, and the superposition becomes obvious with the increase of distance; the main vibration frequencies are low in this case, and the main vibration frequency of vertical component is almost highest in every measuring point; when the distance between measuring point and viaduct is small, the measured values of ground vibration velocity are less than the calculated value by empirical formula, and the distance is larger in the opposite; the measured values and distances are close to the linear relationship; the blasting demolition scheme is reasonable and the surrounding buildings are safe.
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