Modification Research of Pavement Deflection Representative Value Formula Based on Wavelet Transform

Because the measured deflection of expressway asphalt pavement does not obey the normal distribution, the calculation formula of deflection representative value can’t be used. In order to solve it, in the premise of keeping original characteristics of the measured deflection data, by using the two times standard deviation method, the specific data of the original measured deflection data were eliminated and then furthermore the noise of the deflection data was managed through wavelet transform. The normal distribution ratio of the measured deflection data of asphalt pavement were increased from 20.0% to 86.7%, the requirement of the original formula of deflection representative value was meet, so according to the method, the original formula of the deflection representative value can be modified. Engineering Practice shows that the revised deflection representative value calculation formula that was applied to evaluate the pavement structural strength was suitable. Its evaluation result can reflect the actual technical condition of roads.