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| Study on Damping Characteristic Parameters and Dynamic Deflection Distribution of Asphalt Pavements |
| YOU Qing-long1, QIU Xin2, YANG Qing2 |
1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an Shaanxi 710064, China;
2. College of Engineering, Zhejiang Normal University, Jinhua Zhejiang 321004, China |
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Abstract To attain the data of effective dynamic deflection basin utilized to implement modulus backcalculation of asphalt pavement, by dynamic finite element method, the solution method of damping coefficients of pavement structural layers is discussed, the estimation model of subgrade damping coefficients is established, and the influence of testing loading's dynamic effect and discontinuous contact behavior between structural layers on distribution features of surface dynamic deflection basin is investigated. The results demonstrate that (1) subgrade damping coefficient is a main factor affecting surface dynamic deflection distribution, which is mainly controlled by subgrade modulus, while influence of other structural parameters on subgrade damping coefficients is negligible; (2) when the asphalt pavement is imposed by static and dynamic loadings, the distribution features of dynamic deflection basin has a dynamic deflection basin for the same asphalt pavement; (3) performing back calculation of modulus parameters of structural layers should consider the actual FWD loading characteristics and the interface contact behaviors.
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Received: 15 September 2013
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| Fund:Supported by the Natural Science Foundation of Zhejiang Province of China (No.LY12E08002);the Public Technology Research Projects of Zhejiang Province Technology Hall (No.2013C33023) |
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Corresponding Authors:
YOU Qing-long, youqinglong0730@163.com
E-mail: youqinglong0730@163.com
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2014, Vol. 8 
