实验室柱状试验和实际隧道工程中泥浆渗透的 CFD-DEM 比较

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-10-05 DOI:10.1016/j.compgeo.2024.106816
Jiayuan Liu, Kevin J. Hanley
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引用次数: 0

摘要

泥浆渗透和滤饼形成对泥浆盾构隧道开挖面的稳定性至关重要。实验室柱状试验通常用于研究宏观渗透。然而,这些试验是在垂直方向上进行的,并被一个不透水的圆柱形边界所限制,可能不能很好地反映实际隧道工程中无边界地层的水平渗透情况。本文创建了一个更真实的泥浆压力平衡(SPB)隧道模型,以克服模拟实验室柱状试验的局限性。通过计算流体动力学(CFD)-离散元法(DEM)耦合数值模拟,研究了该模型的泥浆渗入砂中的情况,并将结果与传统的实验室柱状试验模型进行了比较。两种模型产生的滤饼类型相同。SPB 隧道模型产生了更大的渗透距离和范围,但隧道面前的沙区归一化渗透率较低。在 SPB 隧道模型中,该区域内的流体压力消散得更快,导致速度迅速降低,渗透过程更快。虽然 SPB 隧道模型更能代表真实世界的隧道情况,但传统的实验室柱状试验比较保守,在较长的时间范围内会产生类似类型的滤饼。
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CFD–DEM comparison of slurry infiltration in laboratory column tests and in real-world tunnelling
Slurry infiltration and filter cake formation are critical for excavation surface stability in slurry shield tunnelling. Laboratory column tests are frequently adopted to study macroscopic infiltration. However, these tests, in a vertical orientation and confined by an impermeable cylindrical boundary, may not be a good representation of horizontal infiltration into an unbounded stratum in real-world tunnelling. In this paper, a more realistic slurry pressure balance (SPB) tunnelling model was created to overcome the limitations of simulated laboratory column tests. Coupled computational fluid dynamics (CFD)–discrete element method (DEM) numerical simulations were carried out to study the slurry infiltration into sand for this model and compare the results with the conventional laboratory column test model. Both models produced the same types of filter cakes. The SPB tunnelling model yielded larger infiltration distances and ranges, but a lower normalised permeability in the sand region in front of the tunnel face. The fluid pressure within this region dissipated much faster in the SPB tunnelling model, resulting in rapid velocity decreases and a faster infiltration process. Although the SPB tunnelling model is more representative of real-world tunnelling, the conventional laboratory column test is conservative, producing similar types of filter cakes over a longer timeframe.
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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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