Measurement of the Hydraulic Conductivity of Fine-Grained Soils

2009 ◽  
pp. 18-18-47 ◽  
Author(s):  
RE Olson ◽  
DE Daniel
Keyword(s):  
Hydraulic Conductivity ◽  
Fine Grained

Spatial Variability of Contaminant Transport in a Fractured Till, Avedøre Denmark

1999 ◽  
Vol 30 (4-5) ◽  
pp. 333-360 ◽  
Author(s):  
Larry McKay ◽  
Johnny Fredericia ◽  
Melissa Lenczewski ◽  
Jørn Morthorst ◽  
Knud Erik S. Klint
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Field Experiment ◽  
Contaminant Transport ◽  
Tracer Test ◽  
Conductivity Measurements ◽  
Fine Grained ◽  
Downward Migration ◽  
Rapid Transport ◽  
High Degree

A field experiment shows that rapid downward migration of solutes and microorganisms can occur in a fractured till. A solute tracer, chloride, and a bacteriophage tracer, PRD-1, were added to groundwater and allowed to infiltrate downwards over a 4 × 4 m area. Chloride was detected in horizontal filters at 2.0 m depth within 3-40 days of the start of the tracer test, and PRD-1 was detected in the same filters within 0.27 - 27 days. At 2.8 m depth chloride appeared in all the filters, but PRD-1 appeared in only about one-third of the filters. At 4.0 m depth chloride appeared in about one-third of the filters and trace amounts of PRD-1 were detected in only 2 of the 36 filters. Transport rates and peak tracer concentrations decreased with depth, but at each depth there was a high degree of variability. The transport data is generally consistent with expectations based on hydraulic conductivity measurements and on the observed density of fractures and biopores, both of which decrease with depth. Transport of chloride was apparently retarded by diffusion into the fine-grained matrix between fractures, but the rapid transport of PRD-1, with little dispersion, indicates that it was transported mainly through the fractures.

Identification of preferential flow effects on hydraulic conductivity measurements using a fluorescent tracer

2000 ◽  
Vol 37 (2) ◽  
pp. 479-484
Author(s):  
Tom A Al ◽  
David W Blowes
Keyword(s):  
Hydraulic Conductivity ◽  
Measurement Errors ◽  
Preferential Flow ◽  
Conductivity Measurements ◽  
Fine Grained ◽  
The Core ◽  
Core Samples ◽  
Dye Tracer ◽  
Order Of Magnitude ◽  
Constant Head

Core samples were collected from fractured and unfractured zones within fine-grained, unconsolidated mine tailings. The hydraulic conductivity of the core samples was measured in a constant-head permeameter. A fluorescent dye tracer was added to the constant-head reservoir in the permeameter. The tests were run for approximately 48 h, then the cores were sectioned to observe the distribution of dye. Flow through the fractures results in hydraulic conductivity measurements up to one order of magnitude greater than that of unfractured tailings. Observations of the dye distribution in samples following permeameter measurements are used to identify cases where preferential flow in fractures has influenced the hydraulic conductivity measurements. The dye tracer distribution also indicates where measurement errors may be suspected due to flow leakage around the core sample.Key words: tracers, hydraulic conductivity, fractures, tailings.

scholarly journals Data on horizontal hydraulic conductivity of fine-grained soils of the former Lake Texcoco (Mexico)

Data in Brief ◽  
2018 ◽  
Vol 19 ◽  
pp. 1670-1682 ◽  
Author(s):  
Norma Patricia López-Acosta ◽  
David Francisco Barba-Galdámez ◽  
Alejandra Liliana Espinosa-Santiago ◽  
Paloma Inés Choque-Mamani
Keyword(s):  
Hydraulic Conductivity ◽  
Fine Grained

scholarly journals Effect of Fluid Chemistry on the Consolidation and Hydraulic Conductivity of Sand-Clay Liners

2021 ◽  
Vol 13 (20) ◽  
pp. 11213
Author(s):  
Muawia Dafalla
Keyword(s):  
Hydraulic Conductivity ◽  
Saline Water ◽  
Dry Weight ◽  
Coastal Zones ◽  
Clay Liners ◽  
Clay Liner ◽  
Fine Grained ◽  
Fluid Media ◽  
Liner Surface ◽  
Inorganic Chemical

The clay swelling potential of sand-clay liners exposed to saline water or specific chemicals can influence their hydraulic conductivity and other consolidation properties. The effect of saline water or chemicals on the sand-clay liners was thus studied and evaluated. The consolidation characteristics of the sand-clay liner can be different when tested under different fluid media. Bentonite and cement grouts are chemicals that have a significant effect on the sand-clay liners. Cement and bentonite can be used to seal off the openings within the liner to repair a defect or a malfunction. In this study, Al-Qatif clay was used to form a sand-clay liner when mixed with fine-grained sand (clay is 20% by dry weight). Soil samples extracted from this liner were exposed to inorganic chemical solutions. NaCl and CaCl2 solutions with concentration ranges of 0.1%, 0.5%, and 1.5% were used. Acidic water with pH values of 4, 5, and 6 was similarly used as fluid media. The effects of NaCl, CaCl2, and water with different acidity on the consolidation characteristics and hydraulic conductivity were obtained and compared to those of the distilled water. The effects of grout materials containing bentonite (1%, 2%, and 3% by weight) and cement (2.5%, 5%, and 7.5% by weight) were also investigated. The addition of bentonite grout to the liner surface was found to improve its hydraulic conductivity. The cement effect on the compressibility was found to be very significant. The findings of this study can serve as a guide for selecting parameters in the design and assessment of sand-clay liners in semi-arid regions and coastal zones.

scholarly journals Hydraulic Conductivity of Quarry Dust with Sandy Soils

2019 ◽  
Vol 8 (12S) ◽  
pp. 1030-1033
Keyword(s):  
Hydraulic Conductivity ◽  
Sandy Soils ◽  
Research Center ◽  
Fine Grained ◽  
Covering Material ◽  
Previous Decade ◽  
The Impact ◽  
Quarry Dust ◽  
Made In ◽  
Pressure Driven

Water driven conductivity of soil is a significant property in Geotechnical Engineering, because of the way that a large number of the issues related with the plan and development of structures require the assurance of porousness of the dirt ( e.g., dewatering of unearthed locales, leakage through dams, and so forth.). Additionally the requirement for the assessment of the water driven conductivity of fine grained soils utilized as covering material for the regulation of squanders has created a lot of enthusiasm during the previous decade. An endeavor is made in this paper to ponder the impact of compaction on water powered conductivity of sandy soils through consistent head penetrability test in the research center. In this examination the impacts of three degrees of compaction on the water powered properties of two sandy soils and one quarry dust is assessed. Pressure driven conductivities are essentially diminished by the most noteworthy compaction level for every one of the examples. The outcomes show that dirt compaction could unequivocally impact, in various ways, the pressure driven properties of the dirts.

Behaviour of compacted fine-grained soil in a brine environment

1984 ◽  
Vol 11 (2) ◽  
pp. 196-203 ◽  
Author(s):  
K. J. D. Ridley ◽  
J. K. Bewtra ◽  
J. A. McCorquodale
Keyword(s):  
Hydraulic Conductivity ◽  
Clay Mineral ◽  
Clay Content ◽  
Montmorillonite Clay ◽  
Engineering Properties ◽  
Solution Composition ◽  
Fine Grained ◽  
Fine Grained Soil ◽  
Brine Environment

The hydraulic conductivity and engineering properties of compacted fine-grained soils change with time when exposed to a 30% NaCl brine environment. The hydraulic conductivity of brine was found to be greater than that of water in soils where the dominant clay mineral was montmorillonite, whereas a soil rich in illite and kaolinite was virtually insensitive to variations in solution composition. Increases in brine hydraulic conductivities were most pronounced in soils high in montmorillonite where sodium was the dominant adsorbed ion. They demonstrated the most labile hydraulic conductivities. Fine-grained soils, high in montmorillonite clay content, were prone to alteration in engineering properties when soaked in a 30% NaCl brine. However, brine soaking had little effect on soils rich in illite–kaolinite.

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