高速移动载荷作用下板式轨道-软岩路基系统的动力特性分析

运用D'Alembert原理和能量弱变分,建立了板式轨道-软岩路基系统半空间垂向耦合的动力计算模型,研究了高速铁路板式轨道-软岩路基系统的动态响应特征,获得了基床面上和软岩路堤面上各种动态响应值,将其作为确定基床厚度和基床表层厚度的前提依据,以指导无碴轨道路基结构的设计与施工.通过室内试验,对软岩及软岩填料的一般路用性能进行了研究,用其来判断软岩能否作为高速铁路无碴轨道基床以下部分填料的必要条件.

Research on dynamic characteristics of slab track-roadbed systems with soft rock as embankment filling under high speed moving load

It has been founded that the analysis model of semi-infinite three-dimensional spatial finite elements for the slab track-roadbed systems with soft rock as embankment filling, firstly, based on weak variational form of the equilibrium equations for the system in D’Alembert method; and the dynamic characteristics of the slab tracks in high-speed railways are investigated. Various state dynamic response values of the blanket top surface and soft rock filling embankment top surface are acquired, which is important for design and construction of engineering. Secondly, the engineering physico-mechanical characteristics of roadbed filling with soft rock as embankment material have been traversed by indoor test; intensity and deformation characteristics were mastered, It was demonstrated that the fillings can satisfy the requirements provision of ballastless track and embankment for high-speed railway and standards of high-speed railway roadbed design in the aspects of strength and stiffness properties.