不同植筋方案纵连板轨道砂浆层抗剪性能分析

为研究不同温度条件下的合理植筋方案，采用基于表面的内聚力模型模拟轨道板与砂浆层界面剪切破坏过程中层间黏结-脱黏-接触的复杂相互作用关系，考虑剪力筋的非线性约束特性，建立了纵连板式轨道三维有限元模型，并结合既有的推板试验结果对模型合理性进行验证，细致分析不同植筋方案下轨道板与砂浆层间的抗剪性能.研究结果表明:植筋可以明显提高轨道层间抗剪性能；层间开裂时对应的轨道温升幅度可由无植筋时的10.5℃提高到30℃；温升幅度小于20℃时，采用16+8+8植筋方案，温升幅度在20~30℃之间，采用16+16+16+10+8植筋方案，超过30℃时，需辅助其他限位措施. 

Shear Behavior of Mortar Layer in Continuous Slab Track with Different Arrangement Schemes of Embedded Steel Bars

In order to study the reasonable arrangement scheme of embedded steel bars under different temperatures, a three-dimensional finite element model of continuous slab track was established. In the model, a surface based cohesive zone model (SCZM) was introduced and utilized to simulate the complex interaction between track slab and mortar layer in the process of shear failure, which was bonding-debonding-contact. Nonlinear constraint characteristic of shearing steel bars were also considered. Based on the model validated by the results of longitudinal shear test of slab track, shear behaviors of CA mortar layer were analyzed particularly. The results show that embedded steel bars can significantly improve interlayer shear performance of slab track. The increasing extent of temperature when interlayer is cracking increases from 10.5℃ to 30℃.It is suggested that the 16+8+8 arrangement scheme of embedded steel bars could be used when the temperature rise less than 20℃, and 16+16+16+10+8 is also proposed when the temperature rise at 20~30℃, Over 30℃, other measures should be used.