Two-point MPM study of fluidized grains in internal erosion around metro tunnel characterized by an erosion law

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2025-03-29 DOI:10.1016/j.compgeo.2025.107227

Tianxin Qin , Zhu Song , Chen Wang , Fayun Liang

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引用次数: 0

Abstract

Groundwater infiltration through openings in tunnel linings can lead to the migration of fine soil particles from the coarse particle framework due to seepage forces known as internal erosion. However, current numerical methods face limitations in capturing the key process of the fluidization of fine particles surrounding tunnel linings within acceptable computational costs. To address these challenges, we introduce an erosion law into the two-point material point method where (i) the initiation of the fluidization of fine particles is based on the relative velocity between the solid and fluid phases and (ii) the fluidized soil mass is transferred to the fluid phase and migrated by the seepage force. After the verification of the present method, the internal erosion due to tunnel leakage is analyzed, with parametric analyses of the initial fine particle content, groundwater level, internal friction angle, and opening location. The results indicate that internal erosion accelerates the soil loss during tunnel seepage, highlighting the need for significant attention regarding this issue.

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具有侵蚀规律的地铁隧道内冲蚀流化颗粒两点点法研究

地下水通过隧道衬砌的开口入渗，由于内部侵蚀的渗透力，可以导致细土颗粒从粗颗粒框架迁移。然而，在可接受的计算成本范围内，目前的数值方法在捕获隧道衬砌周围细颗粒流化的关键过程方面存在局限性。为了解决这些挑战，我们在两点物质点法中引入了侵蚀定律，其中(i)细颗粒流化的起始是基于固相和流体相之间的相对速度，（ii）流化的土体通过渗流力转移到流体相并迁移。在验证了本方法的基础上，通过初始细粒含量、地下水位、内摩擦角、开口处位置等参数分析，对隧道渗漏引起的内侵蚀进行了分析。结果表明，内部侵蚀加速了隧道渗流过程中的土壤流失，这一问题值得重视。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.