Dynamic Response Of Water-Saturated Concrete Pavement Under Moving Vehicles

Concrete pavement is used extensively to construct high-grade pavement in China. Concrete structure having apertures and the speed of moving vehicles have certain effect on the service life of concrete pavement. Concrete possesses elasticity and the structures have some apertures. However, this character isn’t considered in studying the structure with saturated aperture in most research of concrete pavement. So, it is important for us to study the concrete pavement which is water-saturation and the dynamic response of pavement under moving vehicles.On the basis of Biot’ theory, the dynamic response of water-saturated half-space under moving rectangle load is studied. Fourier transformation is used to solve the differential equations of motion of water-saturated half-space. The influence of permeability and speed of load on the vertical displacement and excess pore-water pressure is analyzed. The results showed that, when the speed is under shear wave velocity, the vertical displacement of water-saturated half-space increases with permeability, the excess pore-water pressure of water-saturated half-space decreases with increasing.With the help of ABAQUS,a model of elastic half-space under moving load is built, and the Dload subroutine is applied. The influence of permeability and speed of load on the three-demensional vertical displacement and excess pore-water pressure is analyzed. The numerical results correspond to the results obtaind ftom the theory.The theory method is introduced to study the water-saturated stratiform concrete pavement under moving rectangle load. Fourier transform and TRM are used to solve the dynamic response of stratiform system, The effect of permeability and speed of load for vertical displacement and excess pore-water pressure of stratiform system is analyzed. The results show tha the vertical displacement of water-saturated stratiform concrete pavement increase with increasing permeability and speed of loadings. The excess pore-water pressure of water-saturated stratiform concrete pavement decreases greatly.With the help of ABAQUS, a model of multi-layered water-saturated stratiform concrete pavement under moving vehicle is built and the loadings are simulated by Dload subroutine. The effect of permeability and speed of load on the vertical displacement and excess pore-water pressure is analyzed. The results obtained from the FEM results correspond to the theoretical results.