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为了获得剪切荷载作用下板式无砟轨道界面黏结破坏过程特征,构建了无砟轨道界面三维有限元模型,采用界面单元模拟了轨道板与砂浆层间界面非线性黏结力-位移关系,分析了多种剪切荷载模式下界面应力、界面黏结承载力、界面破坏区域分布的变化规律.研究结果表明:轨道板与砂浆层界面剪应力纵向分布在轨道板板端加载位置处最大,并逐渐向内衰减;随着荷载的增大,板端处界面剪应力最先超过界面黏结力强度,界面裂缝在该处萌生,并逐步向轨道板内部扩展;双侧加载时界面黏结承载力为264.9kN,大于单侧加载时的209.8kN,但单侧加载时界面裂缝扩展范围更大,使得其承载力能在一定的位移范围内稳定在一定值;随着荷载的增大,界面分段逐步丧失黏结力.
In order to obtain the bond failure process characteristics of slab ballastless track interface under shear load, a three-dimensional finite element model of ballastless track interface was constructed. The interface nonlinear cohesion force-displacement relationship between the slab track and mortar interface was simulated. The results show that the longitudinal distribution of shear stress at the interface of orbital plate and mortar layer is the largest at the loading position of the orbital plate, and gradually changes to With the increase of load, the interface shear stress at the plate end first surpassed the interfacial adhesion strength, the interfacial cracks initiated at this place and gradually expanded to the interior of the track plate. The interfacial adhesion capacity of the interface was 264.9kN , Which is larger than 209.8kN when unilateral loading, but the interface crack expansion range is larger when unilateral loading, so that the bearing capacity can be stabilized at a certain value within a certain range of displacement; with the load increases, the interface segment gradually lost Cohesion.