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为研究飞机移动荷载作用下跑道地基受力特性及土体单元经历的应力路径,采用积分变换和传递矩阵法推导了层状地基各应力分量的半解析解,将道路面层-基层-地基视作多层跑道结构体系,将飞机荷载考虑为作用于跑道上的多个移动轮载的叠加,分析了不同移动轮组荷载组合形式下地基内部土单元的偏应力大小、主应力方向的变化规律,揭示了偏应力路径的基本特性;进一步探讨了跑道不同功能区土单元应力路径的差异性,发现不同功能区域土单元应力路径曲线有显著差异,呈现为全心形-上半心形及下半心形的形态,并开展动态空心扭剪试验观察了三种应力路径下土体累计变形的差异性,从而揭示了跑道差异沉降产生的内在机理。
In order to study the stress characteristics of the runway foundation and the stress path experienced by the soil element under the moving loads, the semi-analytical solutions of the stress components of the layered soil are derived by integral transformation and transfer matrix method. The surface pavement-grass-roots-foundation As a multi-story runway structural system, the aircraft load is considered as the superposition of a plurality of moving wheel loads acting on the runway, and the variation of the eccentric stress and the principal stress direction of the soil elements within the foundation under different combinations of moving wheelsets are analyzed , The basic characteristics of deviatoric stress path are revealed. Further, the differences of stress path between soil elements in different functional areas of runway are also discussed. It is found that there are significant differences in stress path between soil elements in different functional areas. Semi-heart-shaped morphology, dynamic hollow torsional shear tests were carried out to observe the differences of soil deformation under the three stress paths, revealing the inherent mechanism of differential settlement of runways.