多荷载作用下层状土路基的力学特性研究

依据荷载叠加理论，建立了动、静荷载耦合作用下的加载模型，并提出了组合荷载、组合应力、组合沉降变形等概念；根据相似理论建立层状土路基模型，通过室内相似模型试验，对层状土路基在动荷载和静荷载耦合作用下的应力、变形发展规律进行研究，保持动载不变，通过改变静载的大小，研究动、静组合荷载作用下层状土路基的应力和沉降变化规律。结果表明：层状土路基中，各层的组合应力和组合变形随组合荷载的增加而增大，且呈线性变化；组合荷载、沉降变形随着深度的增加呈非线性减小，并成指数函数递减。其结果为公路路基的设计、施工、运行和维护提供了参考依据。

Study of mechanical characteristics of layered subgrade under more loads

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.