Improvement of an accumulation model for high cyclic loading

建议者的高循环累积模型可用于预测承受高循环荷载的地基的永久变形。实际应用的例子是海上风力发电厂的长期变形，这是由风和波浪，或高速铁路轨道的不均匀剩余沉降加载。迄今为止在这一领域所做的研究工作表明，需要进一步研究。该项目的第一阶段主要致力于为模型的材料常数开发简化的校准程序，考虑粒度分布曲线，包括细粉含量，壳石灰含量和颗粒形状。在第二阶段，将研究固有结构（样品制备方法）对累积模型各组成部分的影响。此外，高循环载荷通常是多维的，这导致累积的加速。这被认为是一个新的理论，包括这种影响的应变振幅。然而，这一理论还有待实验验证。高周期模型中提出的影响因素的倍增性也有待证明。此外，最近检测到的（部分或全部）消除记忆的土壤由于单调变形引起的循环预加载的历史必须进行更详细的研究。

The high-cycle accumulation model of the proponents can be used in order to predict the permanent deformations of foundations subjected to a high-cyclic loading. Examples for a practical application are the long-term deformations of offshore wind power plants, which are loaded by wind and waves, or the non-uniform residual settlements of high-speed railway tracks. The research work done so far on this field has demonstrated the need for further research. The first phase of this project was primarily dedicated to the development of a simplified calibration procedure for the material constants of the model, considering the grain size distribution curve including fines content, shell lime content and grain shape. In the second phase, the influence of inherent fabric (specimen preparation method) on the various components of the accumulation model will be studied. Furthermore, a high-cyclic loading is often multi-dimensional, which leads to an acceleration of the accumulation. This is considered by a new theory including such effects for the strain amplitude. However, this theory still has to be experimentally validated. The multiplicativity of the influencing factors as proposed in the high-cycle model has also still to be proven. Furthermore, the recently detected (partial or full) elimination of the memory of the soil due to cyclic preloading history caused by monotonic deformations has to be studied in more detail.