Download or read book Evaluation of Thixotropic Effects on Hydraulic Conductivity of Compacted Clay Soils written by Thomas J. Glibota and published by . This book was released on 1988 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Stress on the Hydraulic Conductivity of Compacted Clay Soil written by Kathryn Leigh Ford and published by . This book was released on 1986 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory Testing to Evaluate Changes in Hydraulic Conductivity of Compacted Clays Caused by Freeze Thaw written by CH. Benson and published by . This book was released on 1994 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several laboratory studies have shown that the hydraulic conductivity of compacted clay may increase up to three orders of magnitude when subjected to freeze-thaw. In this paper, methods to freeze and thaw specimens of compacted clay are reviewed and compared. Methods to measure the hydraulic conductivity of the specimens are also reviewed. Only naturally formed clay soils are considered; soil-bentonite mixtures and other amended soils are not included.
Download or read book Hydraulic Conductivity and Waste Contaminant Transport in Soil written by David Edwin Daniel and published by ASTM International. This book was released on 1994 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relationship of Laboratory and Field determined Hydraulic Conductivity in Compacted Clay Layer written by A. S. Rogowski and published by . This book was released on 1990 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Freeze thaw on the Hydraulic Conductivity of Barrier Materials written by Jason Frederic Kraus and published by . This book was released on 1994 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Infiltrometer Tests for the Determination of Saturated Hydraulic Conductivity of Compacted Clay written by Gautam Belday and published by . This book was released on 1994 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Soil Structure and Thixotropic Hardening on the Swelling Behavior of Compacted Clay Soils written by Charles L. Nalezny and published by . This book was released on 1965 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Borehole Hydraulic Conductivity Equations and Field Determined Soil Water Characteristic Curves written by Johnathan Dale Blanchard and published by . This book was released on 2017 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The methods utilized 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) standard, were evaluated. Data from hydraulic conductivity tests, as performed on three test pads, were utilized to review the ASTM D6391-11 equations. Additionally, two test pads were instrumented with volumetric water content and soil water matric potential sensors to facilitate the determination of field-obtained soil water characteristic curves (SWCCs) and hydraulic conductivity functions (k-functions) for unsaturated soils. For the determination of the SWCCs and k-functions, each test pad was subjected to an infiltration cycle, using either a sealed double ring infiltrometer or a two-stage borehole infiltrometer, followed by a drying cycle. To compare the results that were obtained from the field-obtained SWCCs and k-functions, laboratory tests were performed on Shelby tube samples acquired from the corresponding test pad. The obtained data were fitted using the van Genuchten model and the RETC (RETention Curve) program. The results that were obtained from TSB testing led to the conclusion that Method B and C, as written in the ASTMs D6391-11 standard contained errors that impacted the results that were obtained from hydraulic conductivity testing. Specifically, utilizing Method C provided results that were four times greater than the hydraulic conductivity and utilizing Method B provided results that were as much as two orders of magnitude greater than the hydraulic conductivity. Several recommendations are proposed herein to ensure accurate hydraulic conductivity analysis is performed in the future. It was further determined that a poor agreement exists between field-obtained and laboratory-obtained k-functions and SWCCs, as reported in other studies. Therefore, field-obtained k-functions are preferential, when available.
Download or read book State of the art Field Hydraulic Conductivity Testing of Compacted Soils written by Joseph O. Sai and published by . This book was released on 1991 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Geotechnical Papers of James K Mitchell written by James K. Mitchell and published by ASCE Publications. This book was released on 2001-01-01 with total page 948 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sponsored by the Geo-Institute of ASCE. This collections contains 35 key papers by James K. Mitchell during his extraordinary career as a geotechnical engineer.Ø In addition to teaching, Mitchell's career encompassed geotechnical projects ranging from research on hazardous waste landfill stability at Kettleman Hills in California, to lunar soil analysis for NASA Apollo Missions, to working with the Mayor of San Francisco following the 1989 Loma Prieta Earthquake. He was elected to the National Academy of Engineering and the National Academy of Science. Topics include: experimental and analytic studies of soil behavior related to geotechnical and geo-environmental problems; soil improvement and ground reinforcement, physicochemical phenomena in soils, the stress-strain time behavior of soils, in situ measurement of soil properties, and mitigation of ground failure risk during earthquakes. ASCE's Engineering Classics series presents selected papers of lasting importance by eminent engineers who have made outstanding contributions to their field.
Download or read book Evaluation of Constant Head Infiltration Test Analysis Methods for Field Estimation of Saturated Hydraulic Conductivity of Compacted Clay Liners written by D. Cazaux and published by . This book was released on 2002 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Field infiltration tests are commonly used to assess the hydraulic conductivity of low permeability materials such as natural clay barriers and compacted clay liners. The soils used for compacted clay liners are always partially saturated and require very long testing times to reach steady-state flow conditions. Consequently, because they are less time consuming, laboratory tests are usually preferred for construction quality control. Nevertheless, it is well-known that field tests are more representative of the clay liner because of the scale effect. This is why, since the 1980s, the main issues associated with field procedures have been studied and several methods proposed for testing low-permeability materials within short time periods. The proposed methods are based on early-time flow analysis in unsaturated conditions and have been applied to various compacted soils under field and laboratory conditions. To evaluate these methods, we carried out a comprehensive testing program using a hydraulic field infiltrometer method (sealed single-ring infiltrometer) and a laboratory rigid-wall permeameter method that reproduces surface field test conditions. The laboratory tests were continued until saturated hydraulic conductivity was obtained so that this value could be compared against the hydraulic conductivity estimated from early-time analysis on the same specimen. The obtained results show the influence of (a) the initial moisture content, (b) the sorptivity and hydraulic head on the early-time infiltration rate, and (c) the final estimated hydraulic conductivity. A comparison of analysis methods shows the limitations of some and tries to explain the reasons for such inadequacies in the description of early-time unsaturated flows. Nevertheless, the conclusions of our study show that conventional early-time analyses give a good estimation of saturated hydraulic conductivity within a short time period compatible with construction quality-control procedures.
Download or read book Statistical Evaluation of the Hydraulic Conductivity of Compacted Lateritic Soil written by CMO Nwaiwu and published by . This book was released on 2005 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1992 with total page 1404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Clod Size on Hydraulic Conductivity of Compacted Clay written by SL. Houston and published by . This book was released on 1992 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study has been conducted to identify the causes for field-measured values of hydraulic conductivity of clay liners being typically two orders of magnitude greater than laboratory-measured values. It has been found through laboratory testing on large specimens that the size and gradation of clods and clumps of clay, prior to compaction, can significantly affect the measured hydraulic conductivity.
Download or read book Effect of Desiccation on Compacted Clays written by Brian Andrew Albrecht and published by . This book was released on 1996 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1981 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
