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Fig. 2. (a) Loading equipment; (b) Distribution of the loads. The detailed size of the model is as follows: the longitudinal length was 2.3 m, the horizontal width of the top was 2.0 m, the horizontal width of the bottom was 3.6 m, and the slope ratio was 1:1, as shown in Fig. 3. Different transducers were installed in the model of the road structure to measure the stresses and displacements. A stress transducer and a displacement transducer were installed in the surface layer at 0.06 m below its upper surface, under one of the loading plate in order to measure vertical pressures and displacements of the surface layer. Other transducers were installed at the bottom of each structure layer, the placement of all the transducers were shown in Fig. 3(a). In the plain of the surface of the subgrade, four stress transducers were placed along the horizontal direction (C-1, CH-2 更多：https://www.bmcx.com/ , CH-3 and CH-4) and longitudinal direction (C-1, CL-2, CL-3 and CL-4), respectively, as shown in Fig. 3(b), to derive the distribution of the dynamic stresses. The distances between each transducer were 0.16 m, 0.20 m and 0.30 m for the horizontal direction, and 0.16 m, 0.20 m and 0.30 m for the longitudinal direction. These transducers and their cables were protected by aluminium tubes to prevent damage from cyclic loadings.