为研究道床裂纹对无砟轨道受力的影响,根据道床裂纹的特点,基于线弹性断裂力学理论,构造20节点六面体奇异等参单元反映裂纹尖端奇......

In recent years,with the continuous development of science and technology,a large number of railways have been built in ......