Canadian Geotechnical Journal, Ahead of Print.
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.

中文翻译：

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用于污泥脱水的真空辅助土工织物和土工膜管组合：理论切换点

加拿大岩土工程杂志，印刷前。
通过内置真空辅助预制水平排水管（PHD）处理高含水污泥，土工布管具有多排水路径的优势，土工膜管具有高真空维持的优势。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、改善脱水效果的有效措施。在本研究中，开发了一种考虑二维渗流的深刻平面应变固结模型，用于解释土工管中污泥的脱水机制。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效率的影响，以供实践设计参考。参数分析揭示了土工织物管最佳效率对应的临界时间，在此之后其固结效率显着下降。然而，土工膜管的固结效率在整个使用过程中都会增加。由此，可以确定土工布管和土工膜管的等效率状态对应的切换点，进行管材转换。