Spatial variations of soil properties occur even within nominally homogeneous soil layers. Therefore, to achieve a reliable geotechnical design, it is necessary to consider local variations of soil properties. Varying soil stiffness leads to spatially variable settlements, implying increasing dynamic forces on passing vehicles. Higher dynamic forces result in additional settlements and simultaneously reduce driving comfort. This process continues steadily until repair of the asphalt pavement is required. The aim of this study was to develop a new mechanically reasoned method for deriving the permissible spatial variation of continuous compaction control (CCC) data from driving comfort requirements. A numerical model was developed that allows modelling of the long-term evenness of asphalt pavements due to passing vehicles, taking into account spatial variation of the subsoil stiffness. The numerical model is based on the subgrade reaction method, modelling the surface and subjacent base courses by a series of spring elements. Thereby, a depth-dependent stress distribution and interactions of the base courses are considered. The initial stiffness of the spring elements is derived from oedometer tests. Depending on the traffic load and utilisation period, the long-term evenness of an asphalt pavement and the effects of a spatially varying subsoil stiffness can be investigated.

中文翻译：

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CCC数据随驾驶舒适性要求随时间的允许空间变化

即使在名义上均质的土壤层内，土壤性质也会发生空间变化。因此，为了实现可靠的岩土设计，必须考虑土壤特性的局部变化。土壤刚度的变化会导致空间沉降的变化，这意味着过往车辆上的动力会增加。较高的动力会导致额外的沉降，同时会降低驾驶舒适性。该过程稳定地继续进行，直到需要修复沥青路面为止。这项研究的目的是开发一种新的机械上合理的方法，用于从驾驶舒适性要求中得出连续压实控制（CCC）数据的允许空间变化。开发了一个数值模型，该模型可以对由于过往车辆引起的沥青路面的长期平整度进行建模，考虑到地基刚度的空间变化。数值模型基于路基反应方法，通过一系列弹簧元素对表面和地下基础层进行建模。因此，考虑了与深度有关的应力分布和基础层的相互作用。弹簧元件的初始刚度来自里程表测试。根据交通负荷和使用期限，可以研究沥青路面的长期平整度以及空间变化的底土刚度的影响。弹簧元件的初始刚度来自里程表测试。根据交通负荷和使用期限，可以研究沥青路面的长期平整度以及空间变化的底土刚度的影响。弹簧元件的初始刚度来自里程表测试。根据交通负荷和使用期限，可以研究沥青路面的长期平整度以及空间变化的底土刚度的影响。