Abstract:

The deflection basin area index method in deflection tests of rigid pavement of current domestic civil aviation airports is analyzed,pointing out that its main problem is the uncertainty of inversion base modulus,which has a one-time difference from radii of relative stiffness and base modulus back calculated by the American Ioannides'regression formula. Besides,the thickness range of pavement slab applied to this method is lack of quantitative index. According to the above problems,finite element method is used to analyze the theoretical deflection data under 156 working conditions. Based on deflection value of the thin plate theory,regression is employed to analyze test data within the error range of 10%,modified regression coefficient of the deflection basin area parameters can be obtained. By back-calculating the public HWD deflection data of America FAA,it shows that the maximum error is 6.9% between the real value and the base modulus back calculated with the modified regression formula. In addition,based on the thin plate theory and finite element method,10% relative errors of deflection value are chosen,puting forward that the thickness range of airport rigid pavement is 20~46cm applied to deflection basin area parameters method.

Key words: deflection basin area index method, relative stiffness radius, base modulus, deflection