A fracture-based discrete model for simulating creep in quartz sands

Jiangtao Lei, Marcos Arroyo, M. Ciantia, Ningning Zhang
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引用次数: 0

Abstract

Creep of granular soils is frequently accompanied by grain breakage. Stress corrosion driven grain breakage offers a micromechanically based explanation for granular creep. This study incorporates that concept into a new model based on the discrete element method (DEM) to simulate creep in sands. The model aims for conceptual simplicity, computational efficiency and ease of calibration. To this end a new form of normalized Charles power law is incorporated into a DEM model for rough-crushable sands based on the particle splitting technique. The model is implemented using a controlled on-off computational strategy. The model is validated by simulating creep in quartz sands in oedometric and triaxial conditions. Model predictions are shown to compare favourably with experimental results in terms of creep strain, creep strain rates and particle breakage. The model proposed would facilitate the calibration of phenomenological continuum models, but may be also useful to directly investigate structural scale phenomena, such as pile ageing.
模拟石英砂蠕变的基于断裂的离散模型
粒状土的蠕变经常伴随着晶粒破裂。应力腐蚀驱动的晶粒破碎为粒状蠕变提供了一种基于微观力学的解释。本研究将这一概念纳入一个基于离散元素法(DEM)的新模型,以模拟砂土的蠕变。该模型力求概念简单、计算效率高且易于校准。为此,基于颗粒分裂技术,将归一化查尔斯幂律的一种新形式纳入了粗糙可挤压砂的 DEM 模型中。该模型采用受控开-关计算策略实现。通过模拟石英砂在气动和三轴条件下的蠕变,对模型进行了验证。结果表明,在蠕变应变、蠕变应变率和颗粒断裂方面,模型预测结果与实验结果相比毫不逊色。提出的模型将有助于校准现象连续模型,但也可能有助于直接研究结构尺度现象,如桩老化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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