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Viscoplastic cyclic degradation model for soft natural soils
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2021-05-06 , DOI: 10.1016/j.compgeo.2021.104176
Bruno Zuada Coelho , Jelke Dijkstra , Minna Karstunen

Cyclic loading affects the long-term response of geostructures build on natural soils. Soft soils are particularly susceptible to the development of large deformations, induced by the repetitive nature of loading. A new viscoplastic cyclic accumulation model is presented, which is an hierarchical extension of the Creep-SClay1S model, to model the long-term permanent deformation resulting from undrained cyclic loading of natural soft clays. The cyclic cumulative strains are incorporated by means of an additional viscoplastic multiplier. This cyclic viscoplastic multiplier adds four additional model parameters that are derived from undrained cyclic triaxial tests. The model is calibrated using experimental data from undrained cyclic triaxial tests performed on high quality block samples of natural Onsøy clay, at different average shear stresses, shear stress amplitudes and loading periods. The accuracy of the proposed model is demonstrated by comparing the element level simulations with the experimental data. The applicability of the proposed model is further illustrated with a boundary value problem, where an embankment submitted to cyclic loading is simulated. The use of the new model enables the simulation of the response of cyclic loaded foundations on soft soils, where the serviceability limit state over a long period of time is governing the design.



中文翻译:

天然软土的粘塑性循环降解模型

循环荷载影响在天然土壤上建立的地质结构的长期响应。由于荷载的重复性,软土特别容易发生大变形。提出了一种新的粘塑性循环累积模型,该模型是Creep-SClay1S模型的层次扩展,用于模拟天然软黏土不排水循环荷载引起的长期永久变形。循环累积应变通过附加的粘塑性倍增器掺入。该循环粘塑性乘数增加了四个额外的模型参数,这些参数是从不排水的循环三轴试验得出的。使用在自然Onsøy粘土的高质量块状样品上进行的不排水循环三轴试验的实验数据在不同的平均剪切应力下对模型进行校准,剪应力振幅和加载周期。通过将元素级仿真与实验数据进行比较,证明了所提出模型的准确性。所提出的模型的适用性通过边值问题进一步说明,其中模拟了周期性荷载作用下的路堤。通过使用新模型,可以对软土上的循环荷载基础的响应进行仿真,在这种情况下,长期处于可使用性极限状态决定了设计。

更新日期:2021-05-07
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