Abstract：The pavement response under FWD load was simulated by ABAQUS when the water level of typical pavement structure changed. The subgrade equivalent resilient modulus was calculated by the methods of iterative inversion and weighted algorithm. The results show that the uplift of the water has obvious influence on the bottom tensile strain of asphalt layer and the pressure strain of the top surface of subgrade, and the trend of the change is similar to the exponential growth. When the water level is low (-6~0 m), the pressure strain of the top surface of subgrade changes more obviously, and the increase is 30.8%. While when the water level rises to the near saturation of subgrade (5~6 m), the bottom tensile strain of the asphalt layer changes more obviously with the increase amplitude of 39.3%. The subgrade equivalent resilient modulus determined by both methods of iterative inversion and weighted algorithm has strong correlation with subgrade moisture, and the subgrade modulus presents obviously linear decreasing trend with the rising of water level.
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2020, Vol. 41 
