Study on Leakage Model of Typical Penetration of Closed Structures Based on Porous Media Seepage Theory

Lin, Xin; Du, Zongliang

doi:10.1155/2022/6901534

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Most often, bolt preloading is carried out simultaneously, with the possibility of loading in two steps. First, the bolts are loaded slightly to establish the contact relationship between various surfaces smoothly, and then the bolts are loaded to the full preload value, [29]. However, on some models, it is possible to apply preloading according to a specific sequence, in one or more passes, [8], [27], [99].…”

Section: Methods Of Preloading Bolted Jointsmentioning

confidence: 99%

“…In this fastener model, referred to as Model B, no threads are taken into account by fusing the bolt and nut. The studies, [27], [28] applied this approach to modeling the preloading process of a multi-bolted flange joint, and, [29], applied it to modeling a flanged sealing structure. Model B was also used by, [30], to calculate the resistance of the bolted joint between the beam and column in a progressive collapse scenario and by, [31], [32], [33], to model different types of beam-tocolumn end-plate joints.…”

Section: Fe-based Fastener Modelsmentioning

confidence: 99%

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Modern Methods for Modelling Bolted Joints at the Assembly Stage – A Systematic Review

Grzejda

2023

Engineering World

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The main aim of the paper is to catalog ways of modeling bolted joints and introducing bolt preload using the finite element method. The paper presents models of bolted joints published in the current decade (i.e. after 1 January 2021 and up to 10 May 2023) in journals of the world's largest scientific publishers, such as: Elsevier, Springer, and MDPI, among others. Reporting of the systematic review was carried out based on PRISMA guidelines. The databases were searched with the EBSCO multi-search engine for the following keywords: bolted joint model, bolted connection model, preload, and finite element method. Additionally, the search results were narrowed down to peer-reviewed papers from the discipline of engineering and written in English. This yielded 2,712 records for further analysis. After removing duplicates from this group, screening was carried out, based on which 1,476 records were excluded from the study. For the remaining group of reports, an eligibility assessment was performed, after which a further 210 reports were excluded from the study. Finally, 86 papers were included in the review. As a result of their examination, six groups of simplified fastener models currently used in the modeling of bolted joints at the assembly stage were described.

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Section: Methods Of Preloading Bolted Jointsmentioning

confidence: 99%

Section: Fe-based Fastener Modelsmentioning

confidence: 99%

Modern Methods for Modelling Bolted Joints at the Assembly Stage – A Systematic Review

Grzejda

2023

Engineering World

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A Leakage Rate Model for Metal-to-Metal Seals Based on the Fractal Theory of Porous Medium

Liu

Ren

et al. 2022

Aerospace

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Due to the complexity of sealing surface topography, it is difficult to take the surface topography into consideration when building a leakage rate model theoretically. Therefore, a theoretical model for estimating the leakage rate of metal-to-metal seals based on the fractal theory of porous medium, which can objectively reflect the influence of sealing surface topography from a microscopic perspective, is proposed in the present work. In the approach, fractal parameters are adopted to characterize the sealing surface. The sealing interface is supposed to be a porous medium space and the intrinsic parameters are obtained through rigorous theoretical derivation. The results show that the topography parameters of the sealing surface have a significant effect on the intrinsic parameters of the pore space and lead to a significant influence on the leakage rate of metal-to-metal seals. Specifically, the smoother the sealing surface, the lower the leakage rate of the metal-to-metal seal. Moreover, the leakage rate decreases with an increase in the contact pressure, and, if the fluid pressure difference is too large, the sealing performance will be seriously reduced. The proposed model provides a novel way to calculate the leakage rate of metal-to-metal seals.

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The Influence of Initial Saturation on the Slurry-Bled Water-Seepage Law of Isolated Overburden Grout Injection

Wang,

Xu,

Xuan

et al. 2024

Applied Sciences

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The grout injection forms a compacted backfill in the separation chamber, and most of the grouting water seeps into the overburden pores. The initial saturation of overlying rock has been found to affect the seepage distribution of effluent in overlying rock. In the actual grouting process, the flow direction of grouting water in overlying rock and the initial saturation of overlying rock may affect whether the bled water will leak to the working face. In order to investigate the influence of initial saturation on the seepage law of isolated overburden grout injection, the present paper studies the saturation change process of bled water seepage at three different initial saturations (Sr = 29%, 51%, 73%). The water leakage of the working face was monitored with the self-developed 3D visual simulation experimental system, without considering the overlying rock of the injection layer. The results show that the bled water flows mainly in the horizontal direction, and the horizontal seepage velocity is about 10 times the vertical seepage velocity. The higher the initial saturation of the overburden, the larger the seepage range of the overburden, and the closer the seepage boundary is to the working face, the easier the bled water will leak into the working face. Therefore, the grouting design and process control can be carried out better. When the thickness of the selected isolation layer is insufficient, the bled water may appear on the working face, so this problem can be improved by increasing the thickness of the isolation layer.

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Study on Leakage Model of Typical Penetration of Closed Structures Based on Porous Media Seepage Theory

Cited by 3 publications

References 16 publications

Modern Methods for Modelling Bolted Joints at the Assembly Stage – A Systematic Review

Modern Methods for Modelling Bolted Joints at the Assembly Stage – A Systematic Review

A Leakage Rate Model for Metal-to-Metal Seals Based on the Fractal Theory of Porous Medium

The Influence of Initial Saturation on the Slurry-Bled Water-Seepage Law of Isolated Overburden Grout Injection

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