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Sedimentation and Consolidation of cohesive and non-cohesive soils formed under turbulent flows
Almabruk, Adam
Almabruk, Adam
Publication Date
2018
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The University of Bradford theses are licenced under a Creative Commons Licence.
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Accepted for publication
Institution
University of Bradford
Department
Faculty of Engineering and Informatics
Awarded
2018
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Abstract
Settling and consolidation of suspended clay particles are significant issue
in many fields such as geotechnical engineering, coastal and hydraulic
engineering, and environmental engineering. A comprehensive literature review
was conducted on the settling, consolidation and erosion of mixed soil material
(cohesive and non-cohesive).
Soil beds formed by sedimentation process of loose particles will be either
show a segregated or homogeneous in structure, depending on the depositional
environment. These sediments initially undergo self-weight consolidation and
may be eroded under high flow rate. A number of studies have recently
investigated the characteristic of consolidated clay bed in stagnant water. Hence,
consolidation parameters were determined using a well-known vertical settling
column consolidation test setup. However, limited research studies are available
for deposition and consolidation of a mixture of sediment (clay, silt and sand)
under flow conditions which are more representative of what happens in nature.
A long flume and pump were used to create different turbulent conditions and
simulate the natural process...
The results for deposition and consolidation of different mixtures under stagnant and turbulence
conditions were analyzed and compered in term of compressibility, permeability
as well as shear strength. The results of this experimental research program
indicated that the flow rate, initial concentration, height of settling and composition
of sediment are all important factors that could affect the final bed dry unit weight.
Two non-intrusive techniques were applied for measuring the dry unit weight at
settling and consolidation stages. Impact echo technique has never been applied
to measure the dry unit weight of self-weight consolidation along the vertical
stratification of cohesive and non-cohesive particles. Also, a novel conductance
sensor has been developed to improve the efficiency of this technique. The
limitations of using these techniques will be highlighted in this study.
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Type
Thesis
Qualification name
PhD