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The effects of the load magnitude and the number of loading cycles on the cumulative deformation (irreversible permanent deformation) of the road structure layers were also investigated in the “CT” experiment, and the results are shown in Fig. 14 and Fig. 15. The cumulative deformation of each layer is the difference between the cumulative deformation of the top and bottom of the layer. It can be seen from Fig. 14 that the relationships between the cumulative deformation and the load magnitude of all the layers were approximately linear, which follow the same trends as those in Fig. 10 and Fig. 11 and Fig. 13. It is worth noting that the increase in the law of cumulative deformation as the number of applied load cycles increases is extremely important in the study of the dynamic behaviour of road structures. Therefore, the effect of the number of loading cycles on the cumulative deformation was investigated, as shown in Fig. 15. As can be seen 更多：https://www.bmcx.com/ , the cumulative deformation of each layer exhibited the same tendency; the cumulative deformation increased with the number of cycles until one million cycles was reached. The cumulative deformation occurs rapidly for a short number of cycles and becomes much lower at other moments. These rapid deformations are a result of the reorganisation of grains of the road structure layers. It can also be observed from Fig. 15 that the cumulative deformation of each layer of the road under repeated loadings can be estimated by Monismith’s exponential formula, Sp=κχN, where Sp denotes the cumulative deformation, N represents the number of loading cycles, and κ and χ are two experimental parameters shown in Table 2 for this situation.