Abstract Fine-grained dredged sediments can be efficiently and sustainably handled by hydraulically filling containment facilities, which can then be reclaimed. This study presents two numerical modelling strategies, characterized by markedly different levels of complexity, that simulate the gradual filling and subsequent consolidation process. Both numerical models employ hydro-mechanical constitutive relations apt to cover wide state ranges, starting from very low effective stresses. Class A predictions of a well-documented case study, where an articulated construction sequence was implemented, are reported and the effectiveness of the two proposed strategies is compared. After updating the numerical predictions according to the recorded construction timeline, the numerical results are validated against field data, specifically versus the monitored height of dredged mud. Finally, the monitoring data are back-analysed, emphasizing the influence of the hydro-mechanical behaviour at high void ratios. The results show that both modelling strategies are sufficiently accurate and can provide substantial benefits to the design of the filling works and to the evaluation of the actual storage capacity of the impoundments, especially if the available volume is limited or if complex construction procedures are implemented.

中文翻译：

---

加埃塔港围堵设施填充期间和之后水力疏浚细粒土壤行为的数值研究

摘要 细粒疏浚沉积物可以通过水力填充围堵设施有效和可持续地处理，然后可以回收利用。本研究提出了两种数值建模策略，其特点是复杂程度明显不同，可模拟逐渐填充和随后的固结过程。两种数值模型都采用流体力学本构关系，易于涵盖从非常低的有效应力开始的宽状态范围。报告了一个有据可查的案例研究的 A 类预测，其中实施了明确的施工序列，并比较了两种建议策略的有效性。根据记录的施工时间表更新数值预测后，数值结果将根据现场数据进行验证，特别是与监测到的疏浚泥浆高度相比。最后，对监测数据进行反分析，强调高空隙率下流体力学行为的影响。结果表明，这两种建模策略都足够准确，可以为填埋工程的设计和蓄水池实际存储容量的评估提供实质性的好处，尤其是在可用容量有限或实施复杂的施工程序的情况下。