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分析在交通荷载作用下 ,路堤填料的动力特性参数对路基的累积残余变形大小的影响 ,为实际工程选择路基填料提供理论上的依据。用 2种工况模拟汽车竖向动载 :(1)反复作用的半波正弦荷载 ;(2 )考虑汽车行驶间隔效应的不连续半波正弦荷载 ,并将第 2种工况等效为连续的半波正弦荷载。利用编制的程序进行非线性 FEM分析 ,计算结果与实测值相符 ,验证了计算方法和计算结果的正确性。分析了路基土的动力特性参数对路基沉降大小的关系。为实际工程设计、施工选择路基土提供了理论依据。
The influence of dynamic characteristics of embankment packing on the cumulative residual deformation of embankment under traffic load is analyzed, which provides a theoretical basis for the selection of roadbed packing in practical engineering. Two kinds of working conditions are used to simulate the vertical dynamic load of the vehicle: (1) half-wave sinusoidal load repeatedly acting; (2) discontinuous half-wave sinusoidal load considering the driving interval effect and the second working condition equivalent to continuous Half-sine sinusoidal load. The nonlinear FEM analysis was carried out by using the programmed program. The calculated results agree well with the measured values, which verifies the correctness of the calculation method and the calculation results. The relationship between the dynamic characteristic parameters of subgrade soil and the settlement of subgrade is analyzed. For the actual engineering design, construction and selection of subgrade soil provides a theoretical basis.