| The disease of void is very common in concrete pavement, it will lead to a sharp increase in pavement load stress, and reduce the life of the road seriously. Joints are the weakest parts of the cement pavement, stress analysis at joints is an important basis for slab thickness design. It can provide a reference for the cement concrete pavement structure analysis and void and load transfer evaluation while studying on the influence of mechanical response of pavement with different degree of void beneath slab and joints load transfer.In this paper,3D finite element analysis model of considering the void and Joints load transfer coupling is established, both mechanical response of concrete pavement and the influence of FWD deflection test with different void and Joints load transfer conditions are revealed by a large number of numerical calculations, then build the relational model between deflection load transfer coefficient and joint stiffness & void size.The main results are as follows:(1) Through literature analysis, summarizes the numerical simulation method of void and joints load transfer. Application of finite element software ABAQUS, the model of considering the void and joints load transfer coupling is established based on determining the other model parameters.(2) Analysis the factors of joint stiffnessã€void size and void degree that impact on the mechanical response of pavement under traffic loading by using the finite element models. Under FWD dynamic load, Further analysis the influence of FWD test deflections and deflection basin curves with different degrees of void beneath slab and joints load transfer coupling.(3) By analysis the relationship between load transfer efficiency and joints stiffness and void degree under FWD dynamic load, evaluation models of load transfer efficiency of cement pavement are established with void or not based on Winkler foundation and elastic half space foundation respectively. |
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