Horizontal drains are gradually introduced to the vacuum preloading method to improve dredged slurries by adding geotextiles to alleviate the blockage in the consolidation process. This study considers the consolidation of slurries enhanced by the vacuum preloading method with geotextile combined horizontal drains based on a double-layered consolidation model. The model approximates geotextile as a special soil layer possessing an equivalent consolidation factor. An analytical solution of the layered consolidation model is obtained using the Laplace transform and the finite Fourier transform method. The effectiveness of the solution is verified by comparing it with the one-dimensional double-layered consolidation solution and the one-dimensional consolidation with a partially permeable boundary. Through comparison with laboratory experiments, the model shows good fitness with the test results in the literature. The influences of related parameters, including the drain arrangement densities, soil parameters, and geotextile parameters, are discussed on average consolidation degree and pore water pressure. The influence mechanism is explained regarding drainage path and vacuum pressure transfer. Findings demonstrate that geotextile facilitates vacuum transfer and promotes soil consolidation, especially when the smaller density of drains’ deposition and lower soil permeability are applied.

中文翻译：

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土工布增强泥浆水平排水真空固结解析模型

水平排水沟逐渐引入真空预压方法，通过添加土工布来改善疏浚泥浆，缓解固结过程中的堵塞。本研究考虑基于双层固结模型，采用土工织物组合水平排水管的真空预压法增强泥浆的固结。该模型将土工织物近似为具有等效固结因子的特殊土层。利用拉普拉斯变换和有限傅里叶变换方法得到了分层固结模型的解析解。通过与一维双层固结解和部分渗透边界一维固结解的比较，验证了该解的有效性。通过与实验室实验对比，该模型与文献测试结果吻合良好。讨论了排水布置密度、土体参数、土工布参数等相关参数对平均固结度和孔隙水压力的影响。解释了排水路径和真空压力传递的影响机制。研究结果表明，土工织物有利于真空传递并促进土壤固结，特别是当排水管沉积密度较小且土壤渗透性较低时。