Abstract
Hydraulic conductivity k as a function of void ratio e and particle diameter for silty sediment was experimentally investigated, and an empirical formula for the estimation of hydraulic conductivity was proposed. Seepage resistance for flow in silty sediment was deliberated. Based on the findings of the study, it was concluded that hydraulic conductivity k could be expressed as an exponential function of void ratio e and median particle diameter d50 {3.1 μm < d50 < 87 μm and 0.26 < e < 4}. It was further found that the formula of seepage resistance factor (?), a form of friction factor, varies linearly with Reynolds number (Re) for silty sediments. A family of such λ-Re curves for various particle diameter d50 is presented.
Highlights
Utilization of dredged fine sediments has attracted wide attention in recent years
In China, the total quantity of dredged fine sediments was 395.5 million m3 in 2017, and that included 169 million m3 from various construction activities related to coastal reservoirs, ports and waterways, 10.3 million m3 from the maintenance of reservoirs, ports and waterways, 142.2 million m3 from land reclamation, and 74 million m3 from various environmental projects
The aim of this study is to investigate hydraulic conductivity and seepage resistance in a silty cohesive soil
Summary
Utilization of dredged fine sediments has attracted wide attention in recent years. In China, the total quantity of dredged fine sediments was 395.5 million m3 in 2017, and that included 169 million m3 from various construction activities related to coastal reservoirs, ports and waterways, 10.3 million m3 from the maintenance of reservoirs, ports and waterways, 142.2 million m3 from land reclamation, and 74 million m3 from various environmental projects. Grain size of silty/muddy sediment measures in microns, and grain size distribution typically covers several orders of magnitude and the specific surface area of the particle is large [11] This fine soil exhibits strong cohesive and viscous characteristics. Where e, e0, ε, and k0 are void ratio and initial void ratio, porosity, and initial hydraulic conductivity of sedimentary beds; CF, S, ρm, and dm are shape coefficient, specific surface area, density, and size of grains that are x% (by weight) finer than the specified diameter of the sediment particle; rw is unit weight; μ is coefficient of dynamic viscosity of seepage flow; A, B, and Ck are coefficients. The aim of this study is to investigate hydraulic conductivity and seepage resistance in a silty cohesive soil. The relationship between seepage resistance and particle Reynolds number was deliberated in detail
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