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新旧路堤的差异变形将导致拼接路面结构的不均匀沉降和附加应力的产生,从而造成路面结构开裂,减弱路面的整体强度。有限元方法能适应复杂的边界条件和材料状态的非线性,有效的模拟路堤沉降差异的横断面形状和路面结构的受力状态。文章利用ABAQUS有限元软件进行非线性分析,扩建路堤采用Mohr-Coulomb弹塑性模型,地基固结沉降采用比奥固结理论,并通过路面检测反算得到各结构层模量,在此基础上建立有限元模型。分析新建路侧路堤沉降对拼接路面的影响,计算路面结构中的剪应力和拉应力分布。分析结果表明:路面面层和基层的拼缝受到横向拉应力和剪应力的共同作用,剪应力相对于拉应力较小,所以应加强拼缝处的抗拉性能。
The differences between the old and new embankments will result in uneven settlement and additional stress in the spliced pavement structure, which will cause the pavement structure to crack and weaken the overall strength of the pavement. The finite element method can adapt to the complicated boundary conditions and the non-linear state of the material, and effectively simulate the cross-sectional shape of the embankment settlement difference and the stress state of pavement structure. The article uses ABAQUS finite element software for nonlinear analysis, expansion embankment using Mohr-Coulomb elastic-plastic model, the foundation consolidation settlement using the Biot consolidation theory, and through the pavement detection back calculated the structural layer modulus, on this basis established Finite element model. The influence of roadbed settlement on the spliced pavement is analyzed, and the distribution of shear stress and tensile stress in pavement structure is calculated. The analysis results show that the patchwork joints of pavement and grassroots are affected by both lateral tensile stress and shear stress, and the shear stress is smaller than the tensile stress. Therefore, the tensile performance of the joint should be strengthened.