一、前言 随着社会主义经济建设的高速发展,铁路运输日益繁忙,列车速度、轴重不断提高,大大增加了轨道荷载,加速了线路破坏,线路维修工作增加,大修周期大大缩短,行车与养护维修之间的矛盾日益突出,人们开始研究一种少维修的轨道结构。这类轨道结构具有整体性 I. Introduction With the rapid development of socialist economic construction, the increasingly heavy railway transportation, the continuous increase of train speed and shaft weight have greatly increased the orbital load, accelerated the destruction of the line, increased the line maintenance work, drastically shortening the overhaul period, The contradiction between maintenance is increasingly prominent, people began to study a less maintenance orbital structure. This type of orbital structure is monolithic