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Improvement of an accumulation model for high cyclic loading

高循环载荷累积模型的改进

基本信息

批准号：
170048988
负责人：
Professor Dr.-Ing. Theodoros Triantafyllidis
金额：
--
依托单位：
Lehrstuhl für Bodenmechanik, Grundbau u Umweltgeotechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/170048988?language=en
关键词：
Improvement accumulation model cyclic loading

项目摘要

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.

提出的高周累积模型可以用来预测高周荷载作用下地基的永久变形。实际应用的例子有海上风电场在风浪作用下的长期变形，或高速铁路轨道的不均匀残余沉降。到目前为止，在这一领域所做的研究工作证明了进一步研究的必要性。该项目的第一阶段主要致力于开发一种简化的模型材料常数校准程序，考虑包括细粉含量、壳层石灰含量和颗粒形状在内的粒度分布曲线。在第二阶段，将研究固有组构(样品制备方法)对累积模型各分量的影响。此外，高周反复荷载往往是多维的，这导致了堆积的加速。一种新的理论考虑了这一点，该理论考虑了应变幅值的这种影响。然而，这一理论仍需实验验证。高周期模型中提出的影响因素的多重性也有待证明。此外，由于单调变形引起的循环预加载历史，最近检测到的(部分或全部)土体记忆消除必须进行更详细的研究。