Owing to their capability in limiting the transport of pollutants in the subsoil, cutoff walls are popular solutions for the confinement of contaminants. These barriers are often made of soil-bentonite or cement-bentonite mixtures, which are characterized by low hydraulic conductivity, low hydrodynamic dispersion, and long-term durability. However, the aggressive chemical environment to which these walls are subjected might negatively impact on their performance. Assessment of their performance with time is thus a crucial issue in wall design. The use of dedicated monitoring wells, cast in place inside the wall during construction when the bentonitic mixture is still fluid, can be particularly suitable for both intercepting and detecting the fluids flowing through the barrier. In this research, the results of a numerical study aimed at providing a methodology to estimate the transport properties of the backfill material at the site scale are presented. The methodology relies on abaci and only requires (i) flow and concentration of contaminant data within a monitoring well inside the barrier and (ii) hydraulic head at inlet and outlet of the barrier to be known.

中文翻译：

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一种从监测井估计截止壁输运特性的程序

由于它们能够限制污染物在底土中的传输，截止墙是用于限制污染物的流行解决方案。这些屏障通常由土壤-膨润土或水泥-膨润土混合物制成，其特点是导水率低、流体动力分散低和长期耐用。然而，这些墙所经受的腐蚀性化学环境可能会对它们的性能产生负面影响。因此，评估它们随时间的性能是墙壁设计中的一个关键问题。在施工期间当膨润土混合物仍为流体时，使用专用监测井在墙内浇筑就位，可以特别适合拦截和检测流过屏障的流体。在这项研究中，数值研究的结果旨在提供一种方法来估计现场规模的回填材料的运输特性。该方法依赖于算盘，并且只需要 (i) 屏障内监测井内污染物的流量和浓度数据，以及 (ii) 屏障入口和出口处的水头是已知的。