废车、减震沟及沙袋缓冲对塌落振动减振效果对比研究

针对城市爆破拆除工程中的塌落振动问题,结合落锤冲击数值模拟与塌落冲击试验研究了减震沟、废弃机动车及沙袋缓冲层等减振措施对塌落振动的减振效果。结果表明,落锤冲击数值模拟与塌落冲击试验动力响应规律较一致,减震沟、废车及沙袋缓冲等均能在一定程度上降低地面质点振动响应峰值;塌落冲击试验中所有振动分量频率均介于10～40 Hz之间,废车及沙袋缓冲对部分振动分量频率影响不明显;在减震沟、废车及沙袋缓冲等3种减振措施中,废车尤其微型面包车缓冲减振效果最好。

Contrastive study on collapse vibration reduction effects of end-of-life vehicles,damping ditch and sandbag buffering

Aimed at the collapse vibration in urban blasting demolition projects,the vibration reduction effects of damping ditch, end-of-life vehicles and sandbag buffering were studied by using numerical simulation of drop-weight impact and collapse vibration tests. The results show that the dynamic response of drop-weight impact numerical simulation is consistent with that of the collapse vibration test. Damping ditch, end-of-life vehicles and sandbag buffering all can reduce the vibration response peak values of ground particles to some extent. All frequencies of the vibration components in collapse vibration tests range from 10 Hz to 40 Hz, and parts of them are not affected so much by end-of-life vehicles and sandbag buffering. Among the three vibration reduction measures, end-of-life vehicles, especially minivans, have the optimal damping effect.