高内压隧道混凝土衬砌内聚裂缝扩展的水力机械建模

IF 3.4 3区 工程技术 Q1 MECHANICS
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引用次数: 0

摘要

采用混凝土衬砌的高压隧道在工程实践中得到了广泛应用。然而,由于混凝土受拉易开裂的特性,衬砌在高内水压作用下不可避免地会产生裂缝,对隧道运营构成严重威胁。本研究旨在开发高内压隧道混凝土衬砌内聚裂缝扩展的水力学数值模型。为此,阐明了内聚元素参数的确定,改进了 ABAQUS 软件中的接触模拟,以准确表征衬砌与围岩之间的界面,并采用间接耦合法实现了 ABAQUS 中的数值计算过程。模拟结果与物理模型试验和工程监测数据非常吻合,表明所提出的方法能够准确模拟高压隧道的水力相互作用。此外,还与采用拉杆约束模拟衬砌-围岩界面的计算模型进行了比较。最后,通过与传统连续介质法的比较发现,两种方法的总体趋势一致。建议在描述连续分析方法无法模拟的裂缝不连续扩展过程时,选择建议的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydro-mechanical modeling of cohesive crack propagation of concrete lining in high internal pressure tunnels
High pressure tunnels with concrete lining have been extensively utilized in project practice. However, due to the characteristic of concrete being susceptible to cracking under tension, the lining inevitably develops cracks under high internal water pressure, posing a serious threat to the operation of tunnels. This study aims at developing a hydro-mechanical numerical model of cohesive crack propagation of concrete lining in high internal pressure tunnels. In this regard, the determination of cohesive element parameters is elucidated, the contact simulation within the software ABAQUS is improved to accurately characterize the interface between lining and surrounding rock, and the numerical calculation process in ABAQUS is realized using indirect coupled method. The simulation results align well with the physical model test and engineering monitoring data, demonstrating that the proposed method can accurately simulate the hydraulic interactions of high pressure tunnel. Additionally, a comparison with calculation models employing tie constraints to simulate the lining-surrounding rock interface is conducted. Finally, comparison with traditional continuum method reveals that while both methods exhibit consistent overall trends. It is recommended to choose the proposed method when describing the discontinuous propagation process of cracks, which cannot be simulated by the continuum analysis method.
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来源期刊
CiteScore
6.70
自引率
8.30%
发文量
405
审稿时长
70 days
期刊介绍: The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.
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