基于纤维影响范围的土壤-纤维排水循环加载试验模型的优化 DEM 建模方法

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Xiaohua Bao , Zhizao Bao , Jun Shen , Xiangsheng Chen , Hongzhi Cui
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引用次数: 0

摘要

由于纤维建模中颗粒大小和接触的限制,离散元建模的计算成本较高。本文提出了一种基于纤维影响范围的土壤与纤维混合模型的优化离散元方法(DEM)。首先,根据不排水循环荷载下纤维与土壤颗粒之间的相对运动状态,建立相对速度状态函数。随后,根据不排水循环加载数值试验的前几个循环,利用相对速度函数确定纤维的影响范围。然后,根据纤维的影响范围生成纤维的簇和团块模型。最后,通过提取影响范围边缘曲线沿轴线垂直方向的分布长度,建立对称形状的优化模型。在本研究中,通过对纤维加固土壤进行一系列排水循环加载数值试验,验证了所提出的优化 DEM。优化模型的结果与传统模型的结果高度一致,而且计算时间显著缩短。分析了确定纤维影响范围的循环加载时间。基于第 15 次循环影响范围的优化模型不仅恢复了几乎相同的结果,还节省了近 8 倍的计算成本。根据第 15 次循环后的影响范围建立的优化模型对结果有轻微影响。此外,还讨论了优化模型的适用性。本文为土壤和纤维混合模型的建立提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An optimization DEM modelling method for soil-fibre undrained cyclic loading tests model based on the influence range of fibre
The computational cost of discrete element modelling is high owing to the limitations of particle size and contact in fibre modelling. This paper proposes an optimised discrete element method (DEM) for a hybrid model of soil and fibres based on the fibre influence range. First, a relative velocity state function is established based on the relative motion state between the fibres and soil particles under undrained cyclic loading. Subsequently, the influence range of the fibres is determined using the relative velocity function based on the first few cycles of the undrained cyclic loading numerical tests. Cluster and clump models of the fibre are then generated based on the influence range of the fibre. Finally, a symmetrical shape of the optimised model is developed by extracting the distribution length of the edge curve of the influence range along the vertical direction of the axis. In this study, the proposed optimised DEM was validated through a series of undrained cyclic loading numerical tests on fibre-reinforced soil. The results of the optimised model were highly consistent with those of the traditional model, and the computational time was significantly reduced. The cyclic loading timing for determining the range of influence of the fibre was analysed. The optimised model based on the influence range of the 15th cycles not only restored almost the same results but also saved the calculation cost by nearly eight times. The optimised model established based on the influence range after the 15th cycles had a slight influence on the results. In addition, the applicability of the optimised model is discussed. This paper provides new insights into the establishment of a hybrid model of soil and fibres.
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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