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Showing 1 to 20 of 22 for “"compacted clay"”.
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A vacuum permeability test for compacted clay
… high hydraulic gradients has been devised for compacted clay of low permeability. The test induces easily measurable flow rates in virtually impervious soils by placing a vacuum at the drainage end of the sample and an elevation head at the inflow end. The apparatus used in the test could …
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Residual pore pressures and shear strength of compacted clay
Thesis: B.S., Massachusetts Institute of Technology, Department of Civil and Sanitary Engineering, 1961
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Effects of anisotropy on the behaviour of unsaturated compacted clay
… were developed on the basis of the modified Cam Clay theory for saturated soils. However, the elasto-plastic models for unsaturated soils were validated based on the data obtained from samples prepared one dimensionally compacted into a compaction mould. This process inevitably generates a degree …
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Numerical study of solute transport in deformable soil liners
… only move in liquid phase. In reality, landfill compacted clay liner (CCL) is compacted on the optimum water content, where the air phase exists in the form of occluded air bubbles. However, the air phase becomes continuous when the temperature increases and then VOCs will be transported in the …
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Investigation of a clay lined storage pit
… shown on the plans, the presence of the bottom clay liner is questionable. Large depressions and numerous cracks were found in the waste area. Acid contamination of the groundwater and the subsoils exists to a considerable depth. Laboratory tests illustrated the susceptibility of the copperas to …
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Trees and Structural Soil as a Stormwater Management System in Urban Settings
… We examined whether tree roots can grow into compacted subsoils and if root penetration increases soil infiltration rate. Quercus velutina, Acer rubrum, and a no-tree variant were planted in 26.5 L (7 gal) containers and the rootballs surrounded by compacted clay loam. Roots grew into all …
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Physical Performance of Geomembranes Used in Heap Leach Pad Applications
… When geomembrane is underlain by geosynthetic clay liner (GCL) and compacted clay liner, the tensile strains increased with increasing deformability (due to higher water content) of the underlying material. Experiments were also conducted to examine the implications of overliner material and …
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Chloride Salts Removal by non Planted Constructed Wetlands Receiving Synthetic Brines from Belle Plaine Potash Mining
… salt filtering component comprising of Regina Clay (grain size <0.002 mm), Brick Sand (grain size <4.75 mm) and sharp gravels (grain size between 6.3-19.1 mm) despite the clay layers contained a poor compact condition (Db =1.4, <1.6 g/cm3). The volume of void space in the compacted clay was …
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An Investigation into the successful establishment of a hay meadow community on clay capped landfill.
… However, landfills are often sealed with a compacted clay cap which not only creates harsh growing conditions and poor soil quality but also results in an impoverished soil fauna making it a challenging environment in which to effect rapid habitat creation. It is currently unclear to what …
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Rapid Drawdown Analysis using the Finite Element Method
… Consolidated-undrained strength tests on compacted clay specimens highlighted the importance of relative compaction on undrained strength. Anisotropic consolidation was shown to produce lower undrained strengths in triaxial compression than isotropic consolidation, especially at higher …
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Containment of Organic Contaminants Using Geosynthetics
… barriers, as well as diffusion of PCBs through a compacted clay liner (CCL) and a GCL. The permeation coefficient (Pg) for BTEX diffusion was lowest for high density polyethylene (HDPE) geomembrane, followed by chlorosulphonated polyethylene (CSPE), linear low density polyethylene (LLDPE), two …
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An Evaluation of Borehole Hydraulic Conductivity Equations and Field Determined Soil Water Characteristic Curves
… to determine the hydraulic conductivity of compacted clay liners (CCLs) are of importance for safe guarding the environment from landfill leachate. Therefore, the methods utilized in the analysis of the Two Stage Borehole (TSB) test, as described in the ASTM D6391-11 (Method A, B, and C) …
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The Effects Of Waste Leachates On The Hydraulic Conductivity Of Natural Clays (volumes I And Ii)
… design practice requires the presence of a clay barrier (liner) that may consist of either a natural stratum or compacted clay borrow. The liner acts as a hydraulic barrier to control the flux of contaminants from the waste into the adjacent groundwater. In order to do this clay liners are …
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Calculating and Limiting Local Strains in Geomembranes From Gravel Indentations
… including the compressibility of the underlying clay layer, particle size of the overlying gravel, and mass of the geotextile protection layer influence local geomembrane strains. Results are provided that can be used to rule out protection layers that are unable to meet a long-term strain limit, …
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Landfill design, construction and non-invasive monitoring
… use as a method of monitoring the placement of compacted clay landfill liners. London Clay and Mercia Mudstone, collected from the QA case study sites, are tested in terms of their suitability as engineered clay liners. Although, London Clay is the most acceptable it is this material which …
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Integrity Assessment Of Earthen Dams And Levees Using Cross-Plot Analysis Of Seismic Refraction And Electrical Resistivity Tomograms
… of compromised zones, such as sand zones and dry compacted clay zones, by incorporating their unique seismic and electrical resistivity attributes into the cross-plot analysis. A new approach of cross-plot analysis using external physical constraints derived from geophysical surveys and …
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Centrifuge modelling of the behaviour of geosynthetic-reinforced soils above voids
… Image Velocimetry. Granular soils and model clay liners were tested, as would be relevant to embankments and landfills respectively. These soils were tested with and without the reinforcement to evaluate the benefit provided by the geosynthetic. Detailed analysis of the centrifuge test …
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Limiting membrane and diffusion behavior of a compacted sand-bentonite mixture for hydraulic and chemical containment
… diffusive contaminant transport. Additionally, compacted mixtures of Na-bentonite and sand can be an effective and economical alternative to barrier materials consisting only of natural clay (e.g., compacted clay liners) if the use of natural clay is not logistically or economically feasible. …
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Saturated–Unsaturated behaviour of compacted clays
Clayey soils are often compacted for geotechnical and geo-environmental construction such as hydraulic dams, road embankments, tailings containment facilities, and municipal landfills. Post construction, these earthworks are exposed to variations in seasonal weather and extreme climatic events …
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Coal Combustion Waste Disposal Facility Design: Electric Power Cooperative Selby, South Dakota
… through and out of landfills. A 24 in. thick compacted clay liner (CCL), a 48 in. thick CCL, and a composite liner consisting of a 60 mil high density polyethylene (HDPE) geomembrane overlying a compacted soil layer were evaluated with and without a leachate collection system. Two cover …
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