基于CFD-DEM的盾构隧道非球形浆体颗粒再入渗动力学模拟

IF 6.7 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Jiayuan Liu, Kevin J. Hanley
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引用次数: 0

摘要

在盾构施工中,浆体入渗过程和滤饼的形成对保证开挖面稳定起着至关重要的作用,因此得到了广泛的研究。以往的研究主要集中在通过实验室柱试验和模拟的静态浆液渗透上。然而,在实际隧道施工中,由于隧道掘进机的向前运动,浆体入渗是一个动态过程,滤饼不断被破坏和重新形成。本文采用计算流体力学(CFD) -离散元法(DEM)耦合模拟方法,建立了模拟掘进机推进过程中浆体动态再入渗的数值模型。模拟了浆液颗粒插入、入渗和刀具推进共20个再入渗步骤,并与静态入渗模型进行了比较。在再渗透模型中,再现了现场测量中隧道工作面的压力波动,显示了压降、空隙率和渗透率的变化。随着砂体粒度的增大,各砂柱内部和深层渗透的浆体颗粒增多,外部积聚的浆体颗粒减少。砂粒粒径越大,动态入渗循环越明显,颗粒入渗程度越深。此外,再入渗模型与静态入渗模型相比,在较大的砂粒粒径下,入渗量减小,使得静态入渗模型对于粗粒砂粒更为保守。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Simulation of non-spherical slurry particle re-infiltration dynamics in shield tunnelling using CFD–DEM
The slurry infiltration process and filter cake formation are widely studied due to their critical role in ensuring the stability of the excavation surface during slurry shield tunnelling operations. Previous studies have predominantly focused on static slurry infiltration through laboratory column tests and simulations. However, in real-world tunnelling, slurry infiltration is a dynamic process due to the forward movement of tunnel boring machines (TBM), where filter cakes are continuously disrupted and re-formed. In this paper, a numerical model simulating dynamic slurry re-infiltration during TBM advancement was developed using coupled computational fluid dynamics (CFD)–discrete element method (DEM) simulations. A total of 20 re-infiltration steps of slurry particle insertion, infiltration and cutter advancement were simulated and compared with static infiltration models. In the re-infiltration model, pressure fluctuations at the tunnel face seen in field measurements were reproduced, showing variations in pressure drop, void fraction, and permeability. As the sand particle size increased, more slurry particles infiltrated the internal and deep regions of each sand column, with fewer accumulating externally. Larger sand particle sizes led to more pronounced dynamic infiltration cycles and deeper particle infiltration. Additionally, the re-infiltration model demonstrated reduced infiltration compared to the static infiltration model at larger sand particle sizes, rendering the static infiltration model more conservative for coarse sands.
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来源期刊
Tunnelling and Underground Space Technology
Tunnelling and Underground Space Technology 工程技术-工程:土木
CiteScore
11.90
自引率
18.80%
发文量
454
审稿时长
10.8 months
期刊介绍: Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.
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