This paper established the axle load distributon model of over load axes by practical axle-meter investigations. To study the effects of over load axes on pavement distress, deflection and deflection basin tests with axle load from 60kN to 190kN were conducted on different pavement structures. The relationship between axle load and its deflection as well as its deflection as in curvature was obtained by statistical analyses. A methodology for deriving the equivalent conversion factors of over load axes to equivalent standard axle loads (ESAL) of 100kN is developed, obtaining the relationship between the equivalent conversion factors and the axle loads. Comparing the calculated deflections with the measured deflections, that elastic layered system theory is suitable for analyzing over load vehicles was verified. Consequently, the stresses and strains caused by over load axes were calculated by elastic layered system theory. The results showed that overload axes led to greater stresses and strains causing premature pavement fatigue distress. To guarantee the expected performance in overload axes pavement, the structure thickness needed increasing was obtained. The results are of referential values in the control of semi-rigid pavement overload in gs. (A)
Samenvatting