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考虑高速铁路纵连板式无砟轨道底座板、摩擦板、端刺结构及路基土体的相互作用关系,深入分析了端刺顶部水平力的传递机理,借鉴水平荷载及弯矩共同作用下单桩承载力及变形的计算公式,推导出适用于计算端刺结构纵向受力与变形的解析算法。该方法中,底座板与摩擦板间“两布”滑动层的摩擦力假定为均匀分布,摩擦板和端刺间传递纵向力和弯矩且满足变形协调条件,路基土体对端刺侧面均匀支撑。解析算法的计算结果和基于有限元软件ANSYS所建立的空间耦合模型具有较好的一致性,说明该文提出的解析算法正确可靠,可实现纵连板式无砟轨道端刺结构纵向位移的快速准确计算。端刺结构计算结果表明:随着大端刺深度、宽度及小端刺数量的不断增加,端刺纵向位移会不断减小,有利于减小底座板的纵向位移及土体的压缩变形。
Considering the interaction between the base plate, the friction plate, the piercing structure and the subgrade soil of the longitudinal slab track of the high speed railway, the transmission mechanism of the horizontal force at the top of the piercing end is analyzed in depth. Taking the horizontal load and the bending moment together, Bearing capacity and deformation of the formula to derive the analytical method applied to calculate the longitudinal force and deformation of the stab structure. In this method, the friction between the base plate and the friction plate is assumed to be uniform, the longitudinal force and bending moment are transmitted between the friction plate and the end plate, and the deformation coordination condition is satisfied. Side of the uniform support. The results of the analytical algorithm are in good agreement with the spatial coupling model based on the finite element software ANSYS, which shows that the analytical algorithm proposed in this paper is correct and reliable, and can realize the fast and accurate longitudinal displacement of the spine structure Calculate. The calculation results of the stab structures show that with the increase of the depth, width and the number of small stabs, the longitudinal displacement of the stab will decrease continuously, which is beneficial to reduce the longitudinal displacement of the base plate and the compressive deformation of the soil.