Abstract:

The loading model of the static load and dynamic load being acted at the same time was established according to the superposition theory. The concepts, for example, combinatory load, combinatory stress and combinatory deformation, were put forward. At he same time, it provides the basis for continuing study the mechanical characteristics of layered subgrade under combinatory loads. Based on the similarity theory, through the resemble model test, the variation of the layered subgrade soil stress and deformation is discussed when the static load and dynamic load are acted at the same time. The variation of stress and deformation of the layered subgrade soil is discussed under keeping the dynamic invariable and changing the static load. The results show that: the combinatory stress and the combinatory deformation of layered subgrade linearly increase with the increasing amount of the combinatory load, the combinatory stress and the combinatory deformation of layered subgrade nonlinearly decrease with the increasing amount of the depth; the rule is exponential function. In conclusion, these results are instructive for the design, construction, operation and maintenance of layered subgrades.

Key words: subgrade, model test, combinatory load, combinatory stress and deformation