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5 Conclusions
Through analyzing the asphalt concrete pavement failure influencing factors and
rainfall infiltration process and rule, we can draw the following several conclusions:
(1) In rainfall conditions, the rain continuously penetrates into surface course and
basic course, the volumetric water content of surface course will gradually increase
until saturation. After the rain stopped, infiltration water is constantly expelled outside
pavement structure from basic course, the volumetric water content of basic course will
decrease rapidly, at this time, the road surface volumetric water will continue to
increase in a short time, but then it will gradually decrease.
(2) The design method based on saturated seepage theory cannot objectively reflect
the real situations of rainwater infiltration to pavement structure, we should take the
unsaturated seepage theory into pavement design, this will help us better understand the
rain infiltration rule.
(3) Control infiltration of asphalt concrete pavement is a comprehensive work, so we
should seriously pay more attention to it. In aspect of the design and construction, we
should take effective measures to reduce the damage of road, and ensure the
performance and service life of road.
References
1. John, S., Zhou, S.: Improving Pavement Sub-Surface Drainage Systems by Considering
Unsaturated Water Flow (2001)
2. Fu, J.: Permeability Performance and Its Decay Law of Drainage Asphalt Concrete
Pavement. Road, 6 (2010)
3. Lei, Z., Yang, S., Xie, S.: Soil Water Dynamics, pp. 34-38. Tsinghua University Press,
Beijing (1988)
4. Tan, X., Chen, S., Yang, M.: Slope Saturated-unsaturated Seepage Analysis under Rainfall.
Rock and Soil Mechanics 24, 381-383 (2003)
5. He, Y.: Rainfall Conditions in The Pavement Structure of Unsaturated Seepage and Drainage
Performance Assessment (MS Thesis). pp. 44-48. South University, Nanjing (2009)
6. Ministry of Communications standards. JTG D50-2006. Roadbed Design. China
Communications Press, Beijing (2006)
7. Sha, Q.: Early Failure of Asphalt Pavement and Prevention. People Communications Press
(2000)
 
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