Dynamic Numerical Analysis of Antimoisture-Damage Mechanism of Permeable Pavement Base
Publication: International Journal of Geomechanics
Volume 10, Issue 6
Abstract
As a permeable base material of pavement, the large stone porous asphalt mixture (LSPM) is used widely in China to lessen the moisture damage of the asphalt pavement. However, the dynamics mechanism of the inhibitory effect of permeable base on moisture damage is not clear yet. The dynamic fluid-solid coupling analysis of the saturated pavement with LSPM base course, considering the asphalt mixtures as the porous medium, was performed using the finite difference numerical code FLAC3D. Numerical results revealed that the positive and negative dynamic pore pressure alternated in the pavement with the approaching and leaving of the wheel loads. The phenomenon of water pumping out of and sucking into the pavement under the moving loads was proved. The flow of fluid in pavement can be regarded as the laminar flow. The presence of the LSPM base course greatly decreased the dynamic pore pressure and the scouring force in the surface course because of the large permeability coefficient of the LSPM. The location of the maximum dynamic pore pressure also changed due to the LSPM base course. Due to the permeable base, the dissipation of the dynamic pore pressure was accelerated and thus the moisture damage was lessened.
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Acknowledgments
This work was supported by the Chinese Natural Science Foundations (Grant Nos. UNSPECIFIED50708056 and 51078222), Shandong Province Reward Fund for Excellent Young and Middle-aged Scientists (Grant No.UNSPECIFIED 2008BS09015), and Key Technologies R&D Program of Shandong Province (Grant No. UNSPECIFIED2008GG10006009).
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 10 • Issue 6 • December 2010
Pages: 230 - 235
Copyright
© 2010 ASCE.
History
Received: Aug 8, 2009
Accepted: Apr 5, 2010
Published online: Apr 10, 2010
Published in print: Dec 2010
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