中文摘要：

塌落体触地诱发的振动是建（构）筑物爆破拆除工程的主要危害，事先对其进行预测是进行工程安全评估以及确定减振措施的前提。为此，基于动量守恒理论，将触地冲击过程简化为塌落体与地表塑性区的非弹性碰撞过程，建立了简化的触地冲击力学模型，并根据振动传播规律，提出了触地振动速度的预测公式。算例表明，该模型计算精度可满足工程需要，且简便易用。

英文摘要：

In demolition blasting projects the vibration caused by the collapse of structure is the most harmful effect. Forecasting the vibration velocity is an essential precondition of safety assessment and de- sign of shock absorption measures. The touchdown impact process was simplified to the inelastic collision of the collapse and the plastic zone of ground. A simplified collapse compact mechanical model was estab- lished by the conservation law of momentum, and based on the propagation law of vibration a calculation formula to forecast the vibration velocity was deduced. Case study indicated the precision of this model could meet the need of the project, and easy to use.