Author: Jody P. KraenzelPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Prediction and Validation of Hydraulic Conductivity of Compacted Soil Liners
Author: Jody P. KraenzelPrediction of Hydraulic Conductivity of Clay Liners
Author: Sadik Jaffer Al-MusawePublisher:
ISBN:
Category : Clay soils
Languages : en
Pages : 299
Book Description
Full-Scale Evaluation of the Performance of Three Compacted Clay Liners
Author: Robert P. ChapuisPublisher:
ISBN:
Category : Bentonite
Languages : en
Pages : 9
Book Description
This paper examines the performance of three compacted clay liners for holding and treating municipal wastewater in three lagoons. The quality controls for the liners included verification of compaction conditions (dry density and water content) and full-scale leakage tests. These were made by filling each lagoon with clear water and monitoring the leakage rate versus water level in the lagoon. This paper presents the quality control data, the predicted local values of the hydraulic conductivity k versus void ratio e, and degree of saturation Sr as achieved by compaction, and a statistical prediction of the large-scale k value for each liner. For this case history, one full-scale test was performed before winter and the measured large-scale k value agreed with the predicted value. Two full-scale tests were performed the following spring, and revealed that frost had seriously damaged the liners of the two lagoons, which had been left empty during winter. The paper thus validates a previously proposed model for predicting hydraulic conductivity, and it also provides a statistical approach to predict the large-scale k value of undamaged clay liners.
State-of-the-art Field Hydraulic Conductivity Testing of Compacted Soils
Author: Joseph O. SaiPublisher:
ISBN:
Category : Soil permeability
Languages : en
Pages : 8
Book Description
Statistical Evaluation of the Hydraulic Conductivity of Compacted Lateritic Soil
Author: CMO NwaiwuPublisher:
ISBN:
Category : Compactive effort
Languages : en
Pages : 10
Book Description
This paper examines the variation of hydraulic conductivity of a compacted lateritic soil with molding water content, dry unit weight, and initial degree of saturation under as-compacted conditions. Trends in the hydraulic conductivity versus molding water content relationships are similar to those obtained for nonlateritic, temperate zone soils. Hydraulic conductivity generally decreased as dry unit weight and initial degree of saturation increased. However, for the same values of dry unit weight, specimens compacted on the wet side of optimum water content yielded lower hydraulic conductivities than those compacted on the dry side of optimum water content. For lateritic soil specimens compacted at about 2% or more on the wet side of optimum water content, hydraulic conductivities less than 1 × 10-7 cm/s can be achieved when the dry unit weight is greater than or equal to 16.3 kN/m3 and initial saturation is greater than or equal to 88%. Statistical analysis of the results obtained in this study show that relatively weak relationships exist between hydraulic conductivity and molding water content or dry unit weight. Stronger relationships are obtained when hydraulic conductivity is plotted against initial degree of saturation. It is shown that a more accurate prediction of hydraulic conductivity can be achieved when a multiple regression equation is used to relate degree of saturation and compaction energy to hydraulic conductivity. The British Standard heavy compactive effort offers a wider range of molding water contents within which soils can be compacted to yield low hydraulic conductivity. This range is, however, limited by consideration for long-term desiccation and shear strength.
An Analysis of Selected Factors Controlling Or Affecting the Hydraulic Conductivity of Compacted Soil Liners
Author: Robert Cary SpeakePublisher:
ISBN:
Category : Sanitary landfills
Languages : en
Pages : 230
Book Description
Relationship of Laboratory- and Field-determined Hydraulic Conductivity in Compacted Clay Layer
Author: A. S. RogowskiHydraulic Conductivity and Waste Contaminant Transport in Soil
Author: David Edwin DanielPublisher: ASTM International
ISBN: 0803114427
Category : Bentonite
Languages : en
Pages : 617
Book Description
Field Hydraulic Conductivity Tests for Compacted Soil Liners
Author: JO. SaiPublisher:
ISBN:
Category : Collection lysimeter
Languages : en
Pages : 11
Book Description
Field hydraulic conductivity tests are required to determine the in situ hydraulic conductivity of compacted clay soils used in the liners for hazardous waste management facilities. The test must be capable of measuring hydraulic conductivities of 1 × 10-9 m/s or less, and the values obtained must be representative of the overall soil liner. Few of the methods available are capable of both measuring low hydraulic conductivities and obtaining representative values. Test methods which meet these requirements include large single-ring infiltrometers, sealed double-ring infiltrometers, and collection lysimeters. The main drawback in the use of collection lysimeters is that it can take months to obtain steady-state hydraulic conductivity values. Sealed double-ring infiltrometers are practical to use and have the advantage of few ambiguities in the experimental procedures, few possibilities for yielding false low values, and are large enough to yield results representing the overall liner characteristics.
A Method of Predicting Hydraulic Conductivity and Water Diffusivity for Pavement Subgrade Soils
Author: Atef ElzeftawyPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 90
Book Description