Numerical Simulation of Drainage Process for Sand Cushion in Saturated Asphalt Pavement
Postgraduate in Geotechnical Engineering
Liu Jianjun1, 2
Drainage has important influence for long-term stability and service life of the pavement. With a lot of researches, it is found that the damage of pavement structure is exacerbated with rainfall or groundwater flowing into the pavement and a repeated traffic load. Pavement structure is divided into surface course, base and cushion. Cushion has good drainage properties and is conducive to the discharge of the free water inside the pavement structure. In this paper, the fluid-solid coupling mathematical model under the condition of saturation has been built based on the effective stress principle, Darcy law and the Biot theory. A three-dimensional numerical model has been established with the finite element software ABAQUS. With the calculation of drainage consolidation process of saturated sand cushion under rolling load, it can provide reference for engineering. The calculation results show that the drainage time and the drainage effect are influenced by rolling load and void ratio. The rate of change of the pore pressure and void ratio is different in the central and the edge of the road. The pore pressure distribution and void ratio are banded and symmetrical.
Keywords: Saturated asphalt pavement; sand cushion; fluid-solid coupling; numerical simulation
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