Vacuum Filtration Theory for Slurry Considering Bidirectional Deformation Based on Elliptical Cylinder Model

IF 3.4 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-06-12 DOI:10.1002/nag.4015

Jiahao Wang, Li Shi, Hongxu Jin, Bo Chen, Zhen Huang

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引用次数: 0

Abstract

Vacuum preloading combined with prefabricated vertical drains is commonly used for enhancing the high water content slurry. However, the process of slurry dewatering, which is inherently a filtration problem, is difficult to describe using consolidation theories. This study presents a new vacuum filtration theory for slurry based on the elliptical cylinder model, where the radial and vertical deformations are governed by the equal settlement assumption. To describe the permeability and compressibility of slurry, the extended power function equations are adopted. The governing equations associated with the influenced zone and the moving boundary are essential components of the vacuum filtration theory, which are solved by the finite difference method. The applicability of the theory is confirmed by comparing the results of it with the laboratory tests and the radial filtration theory. Depending on the properties of the slurry used in the laboratory tests, the filtration behaviour are analysed. Finally, parametric analysis is carried out to investigate the effect of vacuum pressure on the filtration behaviour of the slurry.

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基于椭圆圆柱模型的考虑双向变形的料浆真空过滤理论

真空预压结合预制垂直排水孔是提高高含水率浆体的常用方法。然而，浆体脱水过程本身就是一个过滤问题，很难用固结理论来描述。本文提出了一种基于椭圆圆柱模型的浆体真空过滤理论，其中径向和垂直变形均服从等沉降假设。为了描述浆体的渗透性和压缩性，采用了扩展幂函数方程。影响区和运动边界的控制方程是真空过滤理论的重要组成部分，用有限差分法求解。通过与室内试验结果和径向过滤理论的比较，证实了该理论的适用性。根据实验室测试中使用的浆料的性质，分析了过滤行为。最后，进行了参数分析，研究了真空压力对料浆过滤性能的影响。

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

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

CiteScore

6.40

自引率

12.50%

发文量

160

审稿时长

9 months

期刊介绍： The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.