Analysis on the seasonal effect of subgrade resilient modulus

The paper first analyzes the seasonal variation law of subgrade resilient modulus and water content, and then summarizes the common quantitative adjustment methods, calculation of the equivalence of resilient modulus based upon damage equivalence, for resilient modulus of subgrade in the process of season alterations. Finally, the paper puts forward a seasonal readjustment calculation formula for resilient modulus, which is based upon the principles of yearly subgrade deformation equivalence and has the same structure as that of the existing calculation formula for equivalence resilient modulus but only with a simpler form. Through analyzing and calculating the measured results of subgrade resilient modulus at various periods on site, this formula is testified to be applicable to seasonal adjustment of resilient modulus for design.