CFD-DEM modeling of seepage in foam-conditioned soil

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-10-09 DOI:10.1016/j.compgeo.2024.106818
Rongkai Zeng , Shuying Wang , Yang Zhang , Tongming Qu
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Abstract

Soil conditioning with foam agents can reduce the permeability of virgin soils and mitigate the risk of uncontrollable mud gushing during the excavation of Earth Pressure Balanced (EPB) shield machines. This study employs a combined Computational Fluid Dynamics (CFD) − Discrete Element Method model (DEM) method to simulate the seepage process in foam-conditioned excavated soil. Through discovering migration patterns of foam particles and their effects on macroscopic permeability under various hydraulic gradients, this study unveils the micro-mechanisms governing the permeability of foam-modified soil. Results indicate the feasibility of using hydraulic gradient amplification to examine foam particle migration channels and permeability changes. Furthermore, the findings show that the initial stabilization period in the seepage experiment arises from a dynamic equilibrium between the inflow and outflow of foam in the lower layers. In the upper and middle soil layers, foam migration paths show resilience to water pressure during the initial stage of seepage, but become increasingly responsive to the pressure when migration is hindered. The migration paths of the foam particles in the lower layers remain consistent across different water pressures. The migration speed of individual foam particles is determined by both water pressure and pore structure, while the overall migration speed of the foam increases as water pressure rises.
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泡沫调节土壤中的 CFD-DEM 渗流模型
使用泡沫剂调节土壤可降低原始土壤的渗透性,并降低土压平衡(EPB)盾构机挖掘过程中不可控制的泥浆喷涌风险。本研究采用计算流体动力学(CFD)和离散元法模型(DEM)相结合的方法,模拟泡沫调节挖掘土壤的渗流过程。通过发现泡沫颗粒的迁移模式及其在各种水力梯度下对宏观渗透性的影响,本研究揭示了支配泡沫改良土壤渗透性的微观机制。研究结果表明,利用水力梯度放大法研究泡沫颗粒迁移通道和渗透性变化是可行的。此外,研究结果表明,渗流实验中的初始稳定期源于下层泡沫流入和流出之间的动态平衡。在中上层土层中,泡沫迁移路径在渗流初始阶段对水压表现出弹性,但当迁移受阻时,对水压的反应越来越强烈。下层泡沫颗粒的迁移路径在不同水压下保持一致。单个泡沫颗粒的迁移速度由水压和孔隙结构共同决定,而泡沫的整体迁移速度则随着水压的升高而增加。
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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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