A breakage-based discrete element study of stress relaxation in quartz sands

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2025-03-21 DOI:10.1007/s11440-025-02592-0

Jiangtao Lei, Marcos Arroyo, Matteo Oryem Ciantia, Ningning Zhang

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Abstract

Stress relaxation of quartz sands is simulated using a recently proposed physically based time-to-fracture discrete element method framework. The framework incorporates time-dependency through stress-corrosion-induced grain fracture. This feature is embedded into a pre-existing particle-splitting-based rough-contact crushable model. The model is calibrated to represent Fontainebleau sand, a quartz sand. A controlled on–off computational strategy is adopted to advance the simulation efficiently. Model predictions are shown to compare favourably with laboratory results in oedometric and triaxial conditions in terms of stress relaxation and relaxation rate. Grain size distribution evolution is also tracked and shown to compare well with available laboratory results. The influence of initial mobilized strength q/q_max on stress relaxation is recovered by the model, and explained through increased grain breakage. The simulated relaxation results are examined at the microscale and compared with those from creep experiments. The model displays the nonisochronous behaviour characteristic of sands. The relaxation tests display a state shift towards higher dilatancy conditions that may offer a possible explanation for some observations of pile set-up.

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基于破碎的石英砂应力松弛离散元研究

使用最近提出的基于物理的时间-破裂离散元方法框架模拟石英砂的应力松弛。该框架通过应力腐蚀诱导的晶粒断裂结合了时间依赖性。该特征嵌入到预先存在的基于颗粒分裂的粗接触可破碎模型中。该模型被校准为代表枫丹白露砂，一种石英砂。采用可控开关计算策略，有效地提高了仿真效果。在应力弛豫和弛豫速率方面，模型预测结果与实验结果在径测和三轴条件下比较有利。粒度分布的演变也被跟踪，并显示比较好与现有的实验室结果。该模型恢复了初始动员强度q/qmax对应力松弛的影响，并通过增加的颗粒破碎来解释。在微观尺度上对模拟松弛结果进行了检验，并与蠕变实验结果进行了比较。该模型显示了砂土的非等时性特征。松弛试验显示了向更高的扩容条件的状态转变，这可能为一些桩的观察提供了可能的解释。

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来源期刊

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.