Characteristics of ground vibration caused by blasting demolition collapse of zhuanyang viaduct

Based on measured results, the ground vibration acceleration characteristics caused by blasting demolition collapse of Dunyang viaduct were analyzed. The conclusions were that the peak of ground vibration acceleration decreases with increase in distance; the acceleration peak of vertical component is greater than that of horizontal one, but the difference becomes smaller in the far field; the peak frequency of the ground vibration acceleration measured on line 1 drops exponentially with increase in distance, but the same trend is not found on measuring line 2 and line 3; the peak frequency of tangential component of ground vibration acceleration is the highest on line 1, that on line 2 is higher and that on line 3 is the lowest; the duration of ground vibration acceleration increases with increase in distance, and the duration of its horizontal component is longer than that of its vertical component; vibration reduction measures can reduce the peak value of ground vibration acceleration, and at the same time reduce the peak frequency and lengthen the duration of ground vibration acceleration; the vibration superposition effect of continuous collapse of multiple bridge spans increases the peak value of ground vibration acceleration and reduces the peak frequency, that is adverse to the building security. ©, 2015, Chinese Vibration Engineering Society. All right reserved.