针对腐蚀性岩石螺栓拉出失效的有限元/有限元耦合建模

IF 2.8 3区 工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS
Dong Zhihong, Wu Xu, Xi Xun, Li Jun, Peitao Wang, Peng Li, Pan Jiliang
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引用次数: 0

摘要

锚杆的腐蚀会严重影响锚固结构的长期性能。拉拔行为是锚杆设计和评估中最具实际意义的参考指标。现有研究通常采用简化的力学参数来分析腐蚀锚杆的锚固性能。本文提出了一种新颖的有限元/有限元耦合数值方法,用于研究腐蚀锚杆的拉拔失效。腐蚀产物被模拟为一层颗粒,而岩石、灌浆材料和锚杆被模拟为块体。进行了腐蚀锚杆的拉拔实验。实验得出的拉拔应力-位移曲线用于校准锈蚀参数。此外,还使用统一的铁锈颗粒参数来模拟腐蚀和约束压力对岩钉拉出破坏的影响。研究发现,随着锈蚀的发展,锈蚀层的厚度越来越厚,导致结合强度和临界位移下降。当腐蚀度从 0.62% 增加到 4.83% 时,结合强度和临界位移分别降低了 68.6% 和 80%。此外,约束压力越大,腐蚀对强度降低的影响越显著。该研究为腐蚀锚杆的拉拔破坏提供了一种简单可行的建模方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Coupled FEM/DEM modeling for the pull-out failure of corroded rockbolt

Coupled FEM/DEM modeling for the pull-out failure of corroded rockbolt

Corrosion of rockbolt significantly affects the long-term performance of anchoring structures. The pull-out behavior is a reference of the most practical significance for the design and assessment of rockbolt. Existing research normally uses reduced mechanical parameters to analyze the anchoring performance of corroded rockbolt. This paper presents a novel FEM/DEM coupling numerical method for investigating the pull-out failure of corroded rockbolt. Corrosion products are modeled as a layer of particles, and rock, grouting materials and rockbolt are modeled as bulk. The pull-out experiments of corroded rockbolt are carried out. The pull-out stress–displacement curves from experiments are employed for the calibration of rust parameters. Further, unified parameters of rust particles are used to model the effects of corrosion and confining pressure on the pull-out failure of rockbolt. It has been found that, as the corrosion development, the thickness of the corrosion layer grows thicker, which causes the degradation of bond strength and critical displacement. When corrosion degree increases from 0.62 to 4.83%, the bond strength and critical displacement decrease by 68.6% and 80%, respectively. Moreover, the larger the confining pressure is, the effect of corrosion on the strength reduction is more significant. This study provides a simple and feasible way to model the pull-out failure of corroded rockbolt.

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来源期刊
Computational Particle Mechanics
Computational Particle Mechanics Mathematics-Computational Mathematics
CiteScore
5.70
自引率
9.10%
发文量
75
期刊介绍: GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research. SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including: (a) Particles as a physical unit in granular media, particulate flows, plasmas, swarms, etc., (b) Particles representing material phases in continua at the meso-, micro-and nano-scale and (c) Particles as a discretization unit in continua and discontinua in numerical methods such as Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.
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