中文摘要：

研究了三轴条件下饱和砂土在排水与不排水冲击时的动力响应和冲击后再固结性状．结果说明，不排水冲击时的孔隙水压力在跳跃中不断累积上升后渐趋平稳，冲击时轴向应变随冲击击数、能量的增大呈近线性增长，最大轴向冲击压缩量与能量呈近线性增长，体变产生于冲击后的再固结；排水条件下冲击的孔隙水压力虽会产生跳跃、但不产生累积，轴向应变与冲击击数、最大轴向冲击压缩量与冲击能量的关系近于双曲线，体变量基本产生于冲击阶段．对比发现，同能量、同冲击击数时，不排水条件下冲击的轴向压缩量大于排水冲击的，而排水冲击的总体变要大于不排水冲击的总体变．

英文摘要：

This paper studies the impact properties of saturated sand under drained and un-drained triaxial conditions as well as the reconsolidation features. The results indicate that under the undrained impact, the pore water pressure springs up in an accumulative way and then becomes stable. The axial strain grows with blow counts and the maximum axial deformation increases with impact energy both in a linear way. The volumtric change is generated during the process of reconsolidation; whereas, under the drained impact, the pore water pressure in the process of impact would also spring but not accumulate. The relationship between axial strain and the blow count as well as the maximum axial deformation and impact energy resembles the hyperbolic curves. The volumtric change basically grow out of the phase of impacting. By comparison, it revealed that the axial deformation without draining is larger than that with draining under the same impacting energy and the same blow count, while the total volumtric change with draining will be larger than that without draining.