The vacuum consolidation behavior of dredged slurry improved by horizontal drainage-enhanced geotextile (HDeG) application was investigated. For comparison, vacuum consolidation tests using a prefabricated vertical drain (PVD) and layered prefabricated horizontal drains (PHDs) were conducted. Based on the test results, it was found that by using HDeG, the consolidation rate of the dredged slurry was significantly increased. Thus, the effectiveness of the HDeG method was verified. The nonwoven geotextile sheet of HDeG could provide a sufficient vacuum pressure and drainage and therefore greatly shorten the drainage path. The HDeG-induced consolidation settlement generally matched the calculated 1D consolidation settlement well using a representative coefficient of consolidation. The analysis of scanning electron microscopy images shows that after the vacuum consolidation test, the porosity of the PHD filter (vacuum PHD treatment) was only 11% (21.1% of the initial porosity), while the porosity of the PHD filter of the HDeG was 22.16% (42.6% of the initial porosity), suggesting that the geotextile effectively reduced the apparent clogging of the drains.

中文翻译：

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水平排水增强土工布改善疏浚泥浆真空固结

研究了通过应用水平排水增强土工织物（HDeG）改善疏浚泥浆的真空固结行为。为了进行比较，使用预制垂直排水管（PVD）和分层预制水平排水管（PHD）进行了真空固结测试。测试结果发现，使用HDeG后，疏浚泥浆的固结率显着提高。由此验证了HDeG方法的有效性。 HDeG无纺土工布可以提供足够的真空压力和排水，从而大大缩短排水路径。 HDeG 引起的固结沉降通常与使用代表性固结系数计算的一维固结沉降很好地匹配。扫描电镜图像分析表明，真空固结试验后，PHD过滤器（真空PHD处理）的孔隙率仅为11%（初始孔隙率的21.1%），而HDeG的PHD过滤器的孔隙率为22.16%（初始孔隙率的42.6%），表明土工布有效减少了排水沟的表观堵塞。