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Abstract In light of the stratification of the subgrade and pavement system，evaluation of calculation model for dynamic additional stresses under cyclic dynamic loads is concerned by the theory of elastic layered system. On the assumption that layers of the subgrade and pavement system are elastic，stresses and displacements in the control equations of elastic dynamics are transformed to state vector under modal coordinate，and time factor is separated and eliminated. Then linear equations set with variable of integration are derived from dynamics partial differential equations through Laplace transform，and the transfer matrix for layered subgrade system in the transform domain is achieved by using matrix method. Boundary conditions of dynamic loads imposed on pavement are considered to establish the dynamic additional stresses quantification model for layered road system. Numerical analysis is applied by using Matlab program. Results indicate that errors generated by the suggested model，compared with measured value，are less than 12% in the pavement layers and 35% in the subgrade layers. However，the suggested model reveals that the distribution characteristics of dynamic additional stresses reasonably in the subgrade-pavement system and is significant to practice.
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Received: 14 July 2009
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