The resilient modulus of subgrade is a design parameter of the pavement structure, which is significantly affected by the overlying\nload and traffic load. It is important to calculate the equivalent resilient modulus of the top surface of subgrade based on the\nnonuniform distribution of resilient modulus in subgrade. This paper takes the fully weathered granite soil as the research object.\nFirstly, the soil density of different layers of the subgrade structure is calculated by the degree of compaction of different subgrade\nlayers. Secondly, the overlying load of each point in the subgrade is determined based on the quality of subgrade. Thirdly, the\nsubprogram of the finite element software is compiled and redeveloped based on the elastic constitutive model, and the calculation\nmethod for the resilient modulus of each point in the subgrade under the traffic load is proposed when the convergence criterion is\nset up. Finally, according to the deflection equivalence of the elastic double layer and elastic half-space, the calculation and control\nmethods for equivalent resilient modulus of the top surface of subgrade under nonuniform stress distribution are put forward, and\nthe field verification tests are carried out. The results show that the error range between numerical calculation and field\nmeasurement of equivalent resilient modulus of subgrade is 10%. It shows that the calculation method for equivalent resilient\nmodulus of subgrade proposed in this study is reasonable and effective. The equivalent resilient modulus of subgrade decreases\nwith the increase of traffic load. And the resilient modulus of subgrade soil increases with the increase of subgrade depth. The\nresilient modulus of subgrade soil has a significant impact on the equivalent resilient modulus of subgrade after the overlaying\ngravel layer. The equivalent resilient modulus of the subgrade with the gravel layer increases with the increase of the resilient\nmodulus of the subgrade soil.
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