The kinetics of one-dimensional self-weight consolidation of dredged mud depends on the permeability and the compressibility of the mud, in addition to the height of the mud and the drainage conditions at the boundaries. The process is highly non-linear because of the drastic variation of permeability and compressibility during the densification of the mud. In this work, we investigate the self-weight consolidation of a mixed sediments, dredged from the Belgian rivers and channels and discharged in disposal site

First of all, this study proposes two original experiments, the hydraulic column and the kinematic permeameter, to determine the two constitutive relations governing this self-weight consolidation. A power law is used to relate the permeability with the void ratio of the mud, while a hyperbolic function is preferred for the relation between void ratio and vertical effective stress. Additionally, self-weight consolidation tests of dredged mud are performed in plexiglass column, drained at the base through a layer of sand. The settlement of the mud–water interface and the excess pore water pressure profile are monitored during the tests.

In addition to this experimental characterization, the Gibson’s large strain consolidation equation is solved through a finite difference method to evaluate the ability of the constitutive relations to reproduce the kinetics of self-weight consolidation observed in the consolidation column. Finally, sensitivity analysis of the constitutive relations of the mud is carried out. The model reproduces quite well the evolution of the excess pore water pressure profile in the mud, while the rate of settlement of the mud–water interface is overestimated by the model at very short term. Also, it is observed that the draining sand at the base plays an insignificant role on the speed of consolidation if the permeability of this sand remains lower that the permeability of the mud at the densified state.

疏浚泥浆的一维自重固结动力学取决于泥浆的渗透性和可压缩性，此外还取决于泥浆的高度和边界处的排水条件。由于泥浆致密化过程中渗透率和可压缩性的剧烈变化，该过程是高度非线性的。在这项工作中，我们调查了从比利时河流和渠道疏浚并在处置场排放的混合沉积物的自重固结

首先，本研究提出了两个原始实验，即液压柱和运动渗透仪，以确定控制这种自重固结的两个本构关系。使用幂律将渗透率与泥浆的孔隙率相关联，而对于孔隙率与垂直有效应力之间的关系，优选双曲线函数。此外，疏浚泥浆的自重固结试验是在有机玻璃柱中进行的，在底部通过一层沙子排出。在测试过程中监测泥水界面的沉降和超孔隙水压力剖面。

除了这种实验表征之外，Gibson 的大应变固结方程还通过有限差分方法求解，以评估本构关系再现固结柱中观察到的自重固结动力学的能力。最后对泥浆的本构关系进行敏感性分析。该模型很好地再现了泥浆中超孔隙水压力剖面的演变，而模型在很短的时间内高估了泥水界面的沉降速率。此外，可以观察到，如果该砂的渗透率保持低于致密状态下泥浆的渗透率，则底部的排水砂对固结速度起着微不足道的作用。