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为了研究不同尺度路基融沉作用对路面结构层力学响应的影响,建立了基于热力耦合理论的有限元模型,系统研究不同路基尺度工况下,融沉作用对不同厚度路面、不同材料基层的力学分布规律影响.结果表明:相同的融沉条件下,整体式路基较分离式及二级路基,变形分别增大45%、64%,应力增大17.5%、21.7%.高速公路面层由于路基较宽,地基融沉更容易向上传递,进而导致面层底部应力增大,最终造成面层的破坏.因此,路面设计过程中保证一定的面层厚度,并采用柔性基层减小模量,可有效以降低层底应力水平,并防止基层裂缝向上反射.
In order to study the influence of subgrade melting and thawing on the mechanical response of pavement structure layer, a finite element model based on thermodynamic coupling theory was established. The influence of subsidence on different thickness subgrade and mechanics of subgrade The results show that under the same thaw condition, the deformation of monolith subgrade is 45%, 64% respectively and the stress is increased by 17.5% and 21.7% Therefore, the thickness of the surface layer is guaranteed and a certain amount of flexible base layer is used to reduce the modulus, which may result in the increase of the stress at the bottom of the surface layer and finally the destruction of the surface layer. Effective to reduce the level of stress at the bottom, and to prevent the grass-roots cracks up reflection.