Abstract Air booster vacuum preloading is a newly improved method applied in land reclamation projects. Highly pressurized air can provide an additional pressure difference between the prefabricated vertical drain (PVD) and injection point, thereby increasing the hydraulic gradient and generating small fractures that can improve the soil permeability and the transmission efficiency of the vacuum pressure. However, with a premature activation time, the pressurized air can create air channels connected to the PVD, which may drastically decrease the vacuum pressure. With a delayed activation time, the strength of the dredged clay may be too high to permit fractures, thus limiting the permeability improvement. In this study, soils with degrees of consolidation (DOCs) of 0%, 40%, 60%, and 80% were selected for testing the efficacy of initial booster activation times in four tests. The results show that the pressurizing groups were more effective in improving the consolidation of soils, and the best effect of the use of air booster is obtained when soil has been consolidated to a DOC of 60%. The lower soils of the pressurized groups showed greater increase rates than those demonstrated by conventional vacuum preloading.

中文翻译：

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加压时机对疏浚泥浆空气增压真空固结的影响

摘要 空气增压器真空预压是一种新的改良方法，应用于填海工程。高压空气可以在预制垂直排水管（PVD）和注入点之间提供额外的压差，从而增加水力梯度并产生细小的裂缝，可以提高土壤渗透性和真空压力的传递效率。但是，如果激活时间过早，加压空气会产生连接到 PVD ​​的空气通道，这可能会大大降低真空压力。由于活化时间延迟，疏浚粘土的强度可能太高而不允许破裂，从而限制了渗透率的提高。在本研究中，固结度 (DOC) 为 0%、40%、60%、和 80% 被选为在四项测试中测试初始助推器激活时间的功效。结果表明，加压组对改善土壤固结效果更有效，当土壤已固结到60%的DOC时，使用空气增压器的效果最佳。加压组的较低土壤显示出比常规真空预加载所显示的更高的增加率。