Combined vacuum-assisted geotextile and geomembrane tubes for sludge dewatering: A theoretical switching point

IF 3 3区工程技术 Q2 ENGINEERING, GEOLOGICAL

Canadian Geotechnical Journal Pub Date : 2023-08-28 DOI:10.1139/cgj-2022-0370

Hao Zhang, Honglei Sun, S. Liu, Xueyu Geng, Y. Deng, Yuanqiang Cai

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引用次数: 0

Abstract

Treating the high water-content sludge with vacuum-assisted prefabricated horizontal drains (PHDs) placed inside, geotextile tubes have the advantage of multiple drainage paths, and geomembrane tubes have the superiority of high vacuum maintenance. Therefore, converting the geotextile tube into a geomembrane tube during slurry dewatering is an effective measure for greater dewatering efficiency and better dehydration effect. In this study, a profound plane-strain consolidation model considering two-dimensional seepage is developed for explaining the dewatering mechanism of sludge in the geo-tubes. Analytical solutions are given and validated by the experiment. The impact of major variables on tube efficiency is further discussed to reference the practice design. Parametric analyses reveal the critical time corresponding to the optimal efficiency of the geotextile tube, after which its consolidation efficiency decreases significantly. However, the consolidation efficiency of a geomembrane tube increases throughout the duration. Consequently, a switching point corresponding to the iso-efficiency state of the geotextile tube and geomembrane tube can be determined for the tube conversion.

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组合式真空辅助土工织物和土工膜管用于污泥脱水:一个理论转折点

采用真空辅助预制水平排水管(PHDs)处理高含水率污泥，土工布管具有多条排水路径的优点，土工膜管具有高真空保持的优点。因此，在浆料脱水时将土工布管改为土工膜管是提高脱水效率和脱水效果的有效措施。本文建立了考虑二维渗流的深度平面应变固结模型来解释土工管中污泥的脱水机理。给出了解析解，并通过实验进行了验证。进一步讨论了主要变量对管材效率的影响，为实际设计提供参考。参数分析表明，土工布管的最佳固结效率对应的临界时间，超过该时间，土工布管的固结效率显著下降。然而，在整个过程中，土工膜管的固结效率增加。因此，可以确定一个与土工布管和土工膜管的等效率状态相对应的开关点来进行管转换。

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

Canadian Geotechnical Journal 地学-地球科学综合

CiteScore

7.20

自引率

5.60%

发文量

163

审稿时长

7.5 months

期刊介绍： The Canadian Geotechnical Journal features articles, notes, reviews, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Contributions that have practical relevance are preferred, including case records. Purely theoretical contributions are not generally published unless they are on a topic of special interest (like unsaturated soil mechanics or cold regions geotechnics) or they have direct practical value.