Characteristics of Ground Vibration Caused by Blasting Demolition Collapse of Zhuanyang Viaduct

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (5) : 110-114.

Based on the measured results, ground vibration acceleration characteristics caused by blasting demolition collapse of the viaduct is analyzed, the conclusions are as follows: the peak of ground vibration acceleration decreased with increment of distance; the acceleration peak of vertical component is greater than the horizontal component, but the differences become smaller in the far field; the peak frequency of the ground vibration acceleration measured by line 1 is in exponential attenuation with the increasing of the distance, but the law is not found in measuring line 2 and line 3; the peak frequency of tangential component ground vibration acceleration is highest in line 1, there in turn from high to low are line 2 and line 3; the duration of ground vibration acceleration is increases with the distance, and the horizontal component is longer than the vertical component; vibration reduction measures reduce the peak value of ground vibration acceleration at the same time also can reduce the peak frequency and extend the duration of ground vibration acceleration; vibration superposition effect of continuous multiple bridge spans collapse increase the peak value of ground vibration acceleration and reduce the peak frequency, that is adverse to the building security.

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Based on the measured results, ground vibration acceleration characteristics caused by blasting demolition collapse of the viaduct is analyzed, the conclusions are as follows: the peak of ground vibration acceleration decreased with increment of distance; the acceleration peak of vertical component is greater than the horizontal component, but the differences become smaller in the far field; the peak frequency of the ground vibration acceleration measured by line 1 is in exponential attenuation with the increasing of the distance, but the law is not found in measuring line 2 and line 3; the peak frequency of tangential component ground vibration acceleration is highest in line 1, there in turn from high to low are line 2 and line 3; the duration of ground vibration acceleration is increases with the distance, and the horizontal component is longer than the vertical component; vibration reduction measures reduce the peak value of ground vibration acceleration at the same time also can reduce the peak frequency and extend the duration of ground vibration acceleration; vibration superposition effect of continuous multiple bridge spans collapse increase the peak value of ground vibration acceleration and reduce the peak frequency, that is adverse to the building security.

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Yang Yongqiang1, Hu Jinjun1, Xie Lili1, 2, Dai Junwu1, Wu Xinghe1. Characteristics of Ground Vibration Caused by Blasting Demolition Collapse of Zhuanyang Viaduct[J]. Journal of Vibration and Shock, 2015, 34(5): 110-114

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