Experimental determination of hypoplastic parameters and cyclic numerical analysis for railway bridge backfills

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
A. Stastny, L. Knittel, T. Meier, F. Tschuchnigg
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Abstract

Long integral bridges experience an enhanced cyclic soil structure interaction with their granular backfills, especially due to seasonal thermal loading. For numerical modelling of this interaction behaviour under cyclic loading, it is important to employ a suitable constitutive model and calibrate it thoroughly. However, up to the present, experimental data and calibrated soil models for this purpose with focus on typical well-graded coarse-grained bridge backfill materials are rarely available in the literature. Therefore, one aim of this paper is to present results of a comprehensive cyclic laboratory testing programme on highly compacted gravel backfill material. Based on this, a hypoplastic constitutive model with intergranular strain extension for small strain and cyclic behaviour is calibrated and evaluated against the experimental test data. The soil model’s abilities and limitations are discussed at element test level. In addition, cyclic FE analyses of an integral bridge are conducted with several hypoplastic parameter sets from the literature and compared to the calibrated gravel backfill material. The investigation highlights that poorly-graded sands show significantly smaller cyclic earth pressures compared to well-graded gravels intended for the backfilling of a bridge. The soil structure interaction behaviour is clearly governed by the general soil model stiffness, including the small strain stiffness.

Abstract Image

铁路桥梁回填土低塑性参数的实验测定和循环数值分析
整体式长桥与其颗粒状回填土之间的周期性土体结构相互作用增强,特别是由于季节性热荷载的影响。要对循环荷载下的这种相互作用行为进行数值建模,必须采用合适的构成模型并对其进行全面校准。然而,到目前为止,文献中还很少有针对典型的级配良好的粗粒桥梁回填材料的实验数据和经过校准的土壤模型。因此,本文的目的之一是介绍对高度压实的砾石回填材料进行综合循环实验室测试的结果。在此基础上,针对小应变和循环行为校准并评估了具有晶间应变扩展的低塑性构造模型。在元素测试层面讨论了土壤模型的能力和局限性。此外,还利用文献中的几组次塑性参数对一座整体桥梁进行了循环有限元分析,并与校准后的砾石回填材料进行了比较。研究结果表明,与用于桥梁回填的级配良好的砾石相比,级配不良的砂土所表现出的循环土压力要小得多。土壤结构相互作用行为明显受制于一般土壤模型刚度,包括小应变刚度。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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