以襄渝铁路二线某桥梁工程为依托,采用LS-DYNA软件对深水基础施工中钢护筒在打入过程中的动应力及其屈曲情况进行了分析,并结合现场试验进行了研究,介绍了受轴向冲击载荷作用的结构的动态屈曲准则,讨论了不同激震力、不同壁厚对钢护筒打入过程中动应力的影响,以及随打入深度增加动应力的变化规律和钢护筒可能发生的屈曲形式,分析结果与相关实际工程的现场试验结果表明:钢护筒在冲击载荷作用下最大动应力出现在底部,壁厚减小时,动力屈曲现象一般最先发生在底部某个局部位置,并向其他部位扩展;采用建模计算结合试桩测试的方法为结构优化、降低成本提供了一个有效途径。 Based on a bridge project of the second line of Xiangyu-Yuzhong Railway, the dynamic stress and buckling of the steel casing in the deep-water foundation construction during its launching process are analyzed by using LS-DYNA software, and the field tests are carried out. The dynamic buckling criterion of the structure subjected to axial impact loads discusses the influence of different shock forces and different wall thicknesses on the dynamic stress during the penetration of the steel casing and the variation of dynamic stress with the penetration depth. The possible buckling forms, analysis results and field tests of the related practical projects show that the maximum dynamic stress of the steel casing under the impact load appears at the bottom. When the wall thickness decreases, the dynamic buckling generally occurs first at a certain part of the bottom Location, and to other parts of the expansion; the use of modeling and calculation methods combined with test pile test for structural optimization, reduce costs provides an effective way.