Study On The Damage Of Cement Concrete Pavement

With the development of China’s highway construction, the cement concrete pavement mileage has increased every year. Among the completed pavements,they are always with the property of high strength, stability and durability. Once the slab fracture、void and slab staggering occur,the increase ratio of the damage grows more and more faster,integrity of pavement structure destroyed, carrying capacity reduced, the number of cumulative axle loading decreased, proved to be an accelerated damage. Thus, some research has been made about the problems as follows:(1)The research of damage law and stress、deflection of single cement concrete pavement after slab fracture. Based on the theory of foundation plate and ANSYS finite element, we create the three-dimensional model of Cement Concrete Pavement, verifying its correctness by Nomo model. Undertaking analysis of relationship between slab size and flexural tensile stress、deflection. Apply loads in different location, investigating Stress and strain variation. Finally, deduce the relation between block size and the number of standard cumulative axle loading; analyze the impact the fracture slab has on the damage.(2)The research of damage law and stress、deflection of multi-block cement concrete pavement after slab void. Applied dowel bar into single slab, the three-dimensional model of Cement Concrete Pavement between blocks has been created. Drawing diagrams between void size、shape and deflection、stress, and analyze its variation. Finally, deduce the relation between void form and the number of standard cumulative axle loading; analyze the impact the slab void has on the damage.