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On the hindered settling of sand-mud suspensions

机译：关于泥浆悬浮液的沉降

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摘要

Hindered settling, the process by which the settling of sediment particles becomes impeded due to the proximity of other sediment particles, can be an important process for the coastal modeller, especially in highly muddy environments. It is also a significant process in other disciplines such as chemical engineering, the modelling of debris flow, the study of turbidites, piping of slurries and the understanding of processes occurring within a dredger hopper. This study first examines the hindered settling behaviour of monodisperse suspensions in order to create a framework for polydisperse hindered settling that works for both non-cohesive and cohesive suspensions. The Richardson-Zaki equation is adapted to make it compatible with the changes with viscosity that occur near the point at which suspensions become solid. The modified monodisperse settling equation is then compared to data for hindered settling of cohesive suspensions and shown to be consistent with the transition between hindered settling and the initial permeability phase of consolidation. Based on the monodisperse framework developed initially, this paper proposes a hindered settling model for sand/ mud mixtures which is based on a modification of the Masliyah (1979) and Lockett and Bassoon (1979) hindered settling equation. The model is shown to reproduce the hindered settling of a variety of different sediment mixtures whilst reducing the extent of empiricism often associated with the modelling of polydisperse hindered settling of mud/ sand mixtures.
机译：受阻碍的沉降（由于其他沉积物颗粒的接近而阻碍沉积物颗粒沉降的过程）对于沿海建模者而言可能是重要的过程，尤其是在高度泥泞的环境中。在化学工程，泥石流建模，浊度研究，泥浆管道以及对挖泥船中发生的过程的理解等其他学科中，这也是一个重要的过程。这项研究首先研究了单分散悬浮液的受阻沉降行为，以便为适用于非粘性和内聚悬浮液的多分散受阻沉降建立框架。理查森-扎基（Richardson-Zaki）方程适用于与悬浮液变为固体时发生的粘度变化兼容。然后将修改后的单分散沉降方程式与粘性悬浮液的受阻沉降数据进行比较，并显示出与受阻沉降与固结初始渗透率阶段之间的过渡一致。在最初开发的单分散框架的基础上，本文基于对Masliyah（1979）和Lockett and Bassoon（1979）的受阻沉降方程的修正，提出了一种沙/泥混合物受阻沉降模型。该模型显示出可再现多种不同沉积物混合物的受阻沉降，同时减少了通常与多分散淤泥/沙子混合物受阻沉降建模相关的经验主义程度。

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