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引言 国内外大量研究都已证明,道床的变形和稳定与其内部的应力状态有直接的关系,因此研究道床应力的分布规律一直是受到人们重视的课题。 传统的计算道床应力的方法大多是采用经验,半经验公式,这种方法只能大致地估计道床应力的分布规律,缺乏必要的精度。近年来由于计算机的出现和有限元的推广,国外已经
INTRODUCTION A great deal of researches at home and abroad have proved that the deformation and stability of ballast bed are directly related to its internal stress state. Therefore, studying the distribution law of ballast bed stress has always been a subject of great attention. Traditional methods of calculating bed stress mostly use empirical and semi-empirical formulas. This method can only roughly estimate the distribution of stress in ballast beds and lack the necessary accuracy. In recent years due to the emergence of computers and the promotion of finite element, foreign already