利用离散模型数值模拟了饱和砂土落地冲击实验引起砂样内动孔隙水压力的周期变化 ,指出了出现负压截断的原因 ,给出了孔隙水压力的周期与装砂结构固有频率的关系以及冲击载荷 (对应于实验中的砂土下落高度 )对孔压的影响 The discrete model was used to numerically simulate the periodic variation of the dynamic pore water pressure caused by the sand floor falling test. The reason for the negative pressure cutoff was pointed out. The relationship between the pore water pressure period and the natural frequency of the sand loading structure was given. Influence of impact load (corresponding to drop height of sand in experiment) on pore pressure