An approximate calculation of highway pavement modulus based on FWD deflection basin

The different characteristics of pavement structure layer has been found that it can be directly reflected by FWD (falling weight deflectometer) deflection basin. However, the existing back-calculation method for the pavement modulus is regarded as complex, highly specialized approaches, hence, it is mainly used for the scientific research and design. In this paper, an approximate calculation model of pavement modulus is proposed for engineering by using Bousinesq formula which is based on elastic half-space theory, in addition, the measuring center displacement is checked by Odemark´s consecutive three-layer system, the result shows that it is in accordance with the measured deflection. It means that the approximate calculation for the pavement modulus is simple and available, especially in the use of pavement evaluation.