渗流侵蚀模拟中离散元模型参数影响性分析

丁子玥; 许增光; 曹成; 赵凌峰; 王宇

doi:10.13870/j.cnki.stbcxb.2024.04.036

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渗流侵蚀模拟中离散元模型参数影响性分析

更新时间：2025-03-12

- 渗流侵蚀模拟中离散元模型参数影响性分析
- Influence Analysis of Discrete Element Model Parameters in Seepage Erosion Simulation
- 水土保持学报 2024年38卷第4期页码：143-152
- 作者机构：
  
  西安理工大学省部共建西北旱区生态水利国家重点实验室,西安,710048
- 作者简介：
  
  [ "丁子玥(1999—),女,硕士研究生,主要从事坝基土内部侵蚀数值模拟研究。E-mail:1394086016@qq.com" ]
- 基金信息：
  
  国家自然科学基金项目(52179143,52209167);陕西省科技创新团队项目(2022TD-01);陕西省重点研发计划项目(2022ZDLNY02-04)
- DOI：10.13870/j.cnki.stbcxb.2024.04.036
  中图分类号： S157.1
- 纸质出版：2024
- 稿件说明：
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丁子玥, 许增光, 曹成, 等. 渗流侵蚀模拟中离散元模型参数影响性分析[J]. 水土保持学报, 2024,38(4):143-152.

DING Ziyue, XU Zengguang, CAO Cheng, et al. Influence Analysis of Discrete Element Model Parameters in Seepage Erosion Simulation[J]. 2024, 38(4): 143-152.
丁子玥, 许增光, 曹成, 等. 渗流侵蚀模拟中离散元模型参数影响性分析[J]. 水土保持学报, 2024,38(4):143-152. DOI： 10.13870/j.cnki.stbcxb.2024.04.036.

DING Ziyue, XU Zengguang, CAO Cheng, et al. Influence Analysis of Discrete Element Model Parameters in Seepage Erosion Simulation[J]. 2024, 38(4): 143-152. DOI： 10.13870/j.cnki.stbcxb.2024.04.036.

摘要

[目的] 由于工程中渗流侵蚀发生的隐蔽性和发展的复杂性

离散元模拟成为学者开展渗流侵蚀机理研究的重要手段。固体模型的参数化构建通过控制模型内部颗粒的填充和分布影响水流作用下颗粒的运移和流失

是开展渗流侵蚀离散元模拟的关键环节。[方法] 当前有关离散元模型参数的研究主要为单参数讨论

从土体孔隙、土体颗粒和墙体边壁3个维度出发

考虑孔隙率、颗粒重叠比和墙体模量的变化构建6组土体模型

对其进行向上渗流计算并记录内部颗粒流失过程、力链结构变化及孔隙率变化过程

以评估3个参数对模型的影响性大小并从细观角度分析离散元模型参数对渗流侵蚀过程的影响机理。[结果] 离散元模型参数通过影响模型内部的颗粒和力链组成影响水流作用下颗粒的流失阶段。初始孔隙率控制模型内部的颗粒填充数目;墙体模量和颗粒重叠比影响模型内部的接触数目。颗粒和接触数目较多的模型

其内部颗粒多以颗粒群的形式移动;反之

不形成接触的自由细颗粒以单颗粒在模型内部发生纵向迁移

孔隙率曲线呈现波动变化。[结论] 研究结果从细观角度阐述参数对模型的影响

以期为基于流固耦合理论的离散元模拟方法的使用提供理论参考。

Abstract

[Objective] Due to the hidden nature of seepage erosion occurring in engineering and the complexity of its development

discrete element simulation has become an important tool for scholars to carry out research on seepage erosion mechanisms.The parametric construction of the solid model influences the transport and loss of particles under water flow by controlling the filling and distribution of particles within the model

and is a key component in carrying out discrete elemental simulations of seepage erosion. [Methods] The current research on discrete element model parameters is mainly a single-parameter discussion. In this paper

from the three dimensions of soil pore space

soil particles and wall sidewalls

six sets of soil models are constructed by considering the changes of porosity

particle overlap ratio and wall modulus

and upward seepage calculations are carried out to record the internal particle loss process

the structural change of the force chain

and the change of the porosity process

in order to evaluate the influence of the three parameters on the model. The influence mechanism of the discrete element model parameters on the seepage and erosion process was also analyzed from a fine-grained point of view. [Results] Discrete element model parameters affect the stage of particle loss under water flow by influencing the composition of particles and force chains within the model. Initial porosity controls the number of particles filling the interior of the model; wall modulus and particle overlap ratio affect the number of contacts within the model. Models with a high number of particles and contacts have internal particles that tend to move as clusters of particles; conversely

free fine particles that do not form contacts undergo longitudinal migration as single particles within the model

and the porosity profile shows fluctuating changes. [Conclusion] In this study

the effect of parameters on the model is described from a fine-grained point of view

with a view to providing a theoretical reference for the use of discrete element simulation methods based on the fluid-structure coupling theory.

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