| Mechanistic-empirical pavement design (MEPDG) requires knowledge of material characteristics of pavement layers. Civil Engineering Research Institute for Cold Region has constructed a series of tests at the test sites to establish a MEPDG in a cold region. [*]Since pavement layer moduli are greatly affected by its surroundings and seasonal changes、 FWD tests have been conducted three times a year at the test sites. Pavement is modeled by viscoelastic multilayered half space composed of Voigt model. Layer modulus and damping are identified by the Gauss-Newton method with implementation of wave propagation theory. [*]The results are confirmed by comparing the computed with measured deflections and also by computed strains and earth pressure with their measured values. Also static backcalculation results are compared with dynamic results. It is found pavement behavior at FWD test can be well explained by using the dynamic backcalculation results. |
