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1 问题的提出最早的铁路建于100～150年前,铁路的上部结构,即铁轨、枕木和碎石经常承受越来越大的负荷和速度的作用,路基几乎不能再有增强作用了.在很多情况下,路基和土壤已不能接受现代化交通的速度、载荷和频率.这就导致承载能力下降,
1 PROBLEM PROPOSED The earliest railway was built 100-100 years ago, the superstructure of the railway, that is, railroad tracks, sleepers and gravel often bear greater and greater load and speed of the role of the roadbed can hardly be enhanced. In many cases, subgrade and soil are no longer able to accept the speed, load and frequency of modern traffic, resulting in a decrease in carrying capacity,