Download or read book Measurement of Thermal Conductivity Function of Unsaturated Soil Using a Transient Water Release and Imbibition Method written by Yi Dong and published by . This book was released on 2014 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal conductivity of unsaturated soil depends on soil water content and soil type. A transient water release and imbibition method (TRIM) is modified to include measurement of the thermal conductivity function (TCF) in conjunction with concurrent measurement of the soil water retention curve (SWRC) and hydraulic conductivity function (HCF). Two pairs of dielectric and thermal needle sensors are embedded in the soil specimen to monitor spatial and temporal variation of water content, thermal conductivity, and thermal diffusivity during drying and wetting processes. Three different soils, including pure sand, silt, and clayey sand are used to examine the effectiveness and validity of the new technique. The thermal conductivity data from the modified TRIM technique accords well with other independent measurements. The results show that the modified TRIM technique provides a fast and accurate way of obtaining thermal properties of different types of soils under both drying and wetting states. The typical testing time for a soil going through a full saturation variation is less than 3 weeks. We observe that the hysteresis in thermal conductivity during a wetting and drying cycle is much less pronounced than that of the hydraulic hysteresis.

Download or read book Unsaturated Soils Research Applications written by Nasser Khalili and published by CRC Press. This book was released on 2014-06-05 with total page 1872 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsaturated Soils: Research and Applications contains 247 papers presented at 6th International Conference on Unsaturated Soils (UNSAT2014, Sydney, Australia, 2-4 July 2014). The two volumes provide an overview of recent experimental and theoretical advances in a wide variety of topics related to unsaturated soil mechanics:- Unsaturated Soil Behavi

Download or read book Laboratory Tests for Unsaturated Soils written by Eng-Choon Leong and published by CRC Press. This book was released on 2023-02-16 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: The testing of unsaturated soils requires greater care and effort than that of saturated soils. Although unsaturated soil mechanics has been embraced by geotechnical engineering, engineering practice has not yet caught up as the characterization of unsaturated soils is difficult and time-consuming, and made harder still by a lack of standards. Laboratory Tests for Unsaturated Soils collates test procedures to cover all laboratory tests for characterising unsaturated soils. It covers the background, theory, test procedures, and interpretation of test results. Each test procedure is broken down into simple stages and described in detail. The pitfalls of each test and the interpretation of the test results are explained. Test data and calculation methods are given, along with many numerical examples to illustrate the methods of interpretation and to offer the presentation of typical results. The book is especially useful for students and researchers who are new to the field and provides a practical handbook for engineering applications.

Download or read book Unsaturated Soils Research Applications written by Adrian R. Russell and published by CRC Press. This book was released on 2020-09-23 with total page 907 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the contributions to the Second European Conference on Unsaturated Soils, E-UNSAT 2012, held in Napoli, Italy, in June 2012, and includes more than one hundred papers, addressing three thematic areas: experimental, modelling, and engineering.

Download or read book Challenges and Innovations in Geotechnics written by Askar Zhussupbekov and published by CRC Press. This book was released on 2016-12-01 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: Challenges and Innovations in Geotechnics is a collections of papers presented at the Eighth Asian Young Geotechnical Engineering Conference (8AYGEC, Astana, Kazakhstan, 5-7 August 2016), and covers various aspects the areas of soil mechanics and geotechnical engineering. The book contains special and keynote lectures and contributions on a wide range of topics in geotechnical engineering and construction: (1) Laboratory and Field Testing (2) Foundation and Underground Structure (3) Ground Improvement (4) Earthquake and Environment (5) Numerical and Analytical Modeling (6) Advanced Soil Mechanics (7) Historical Sites Challenges and Innovations in Geotechnics was published under the auspices of the ISSMGE TC-305 ‘Geotechnical Infrastructures for Megacities and New Capitals’, and reflects the present and future state of geotechnical engineering. The book will be extremely useful to geoengineers and researchers in the abovementioned areas.

Download or read book From Research to Applied Geotechnics written by N.P. López-Acosta and published by IOS Press. This book was released on 2019-11-26 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first Pan-American Conference on Soil Mechanics and Geotechnical Engineering (PCSMGE) was held in Mexico in 1959. Every 4 years since then, PCSMGE has brought together the geotechnical engineering community from all over the world to discuss the problems, solutions and future challenges facing this engineering sector. Sixty years after the first conference, the 2019 edition returns to Mexico. The XVI PCSMGE 2019 conference was held in Cancun, Mexico, from 17 – 20 November 2019. This book presents the plenary lectures from the conference, delivered by distinguished geotechnical engineers of international renown. Experience and youth combine in this special publication, which includes the 9th Arthur Casagrande lecture, the plenary lecture of the ISSMGE President, 3 Bright Spark lectures, and the manuscripts of the 13 invited lecturers of practically all the technical sessions at the XVI PCSMGE 2019. Topics cover both research and applied geotechnics, including recent developments in geotechnical engineering. Representing a valuable reference for engineering practitioners and graduate students, and helping to identify new issues and shape future directions for research, the book will be of interest to all those working in the field, involved in soil mechanics and geotechnical engineering.

Download or read book Thermal Conductivity of Unsaturated Soils written by Jun Yao and published by . This book was released on 2018 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat transfer through soils is a fundamental process in many energy geosystems such as shallow geothermal heat exchangers, energy piles, buried high-voltage power cables in wind or solar energy applications, and subsurface thermal energy storage systems. In these and other applications in the growing field of energy geotechnics, thermal conductivity of unsaturated soils is critical for the performance of these energy geosystems involving coupled heat and moisture transport phenomena. There is considerable basic research need to more effectively link the fundamental soil thermal behavior to the soil (e.g., soil types and water content), environmental (e.g., temperature), and construction (e.g., stress) factors. The first objective of this study is to explore appropriate experimental techniques and procedures to measure the thermal conductivity of unsaturated soils. Experiments were conducted to compare two sensing techniques for measuring thermal conductivity of unsaturated soils: (i) a modified transient plane source (MTPS) method for non-destructive measurements using a planar, interfacial heat reflectance sensor; and (ii) a transient line source (TLS-SP) method utilizing an embedded single-probe heat source. Measurement protocols for coarse-grained and fine-grained soils were developed. Thermal conductivity dry out curves (TCDCs) were measured for five soil types, including poorly-graded sand, well-graded sand with silt, silty sand, silt, and clay. The MTPS sensor consistently produced higher thermal conductivity for degrees of saturation greater than about 50%, but lower thermal conductivity for saturations less than 50%. Saturated thermal conductivity measured using the MTPS sensor ranged from 8% to 26% greater than values measured using the TLS-SP sensor. Dry thermal conductivity measurements were comparable (

Download or read book A Transient Method for Measuring Soil Water Diffusivity and Unsaturated Hydraulic Conductivity written by D. R. Scotter and published by . This book was released on 1983 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermal Properties of Soils written by Omar T. Farouki and published by Trans Tech Publications. This book was released on 1986 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Methods for Calculating Soil Thermal Conductivity written by Omar Farouki and published by . This book was released on 1982 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Conductivity Measurement in Unsaturated Soils with a Modified Cone Penetrometer written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this project, a new cone penetration test (CPT) method for the determining the hydraulic properties of unsaturated soil was developed. A modified cone penetrometer (cone permeameter) is used to inject water into the soil under constant pressure through a screen and measure movement of the wetting front with tensiometer rings. An inverse methodology is used to analyze the cumulative inflow volume and pressure head readings to obtain estimates of the hydraulic conductivity and soil moisture retention curves for the soil. To accomplish the inversion, a cone permeameter test is numerically simulated with the radially symmetric form of Richard's equation and the van Genuchten hydraulic conductivity and moisture retention functions. An objective function expressing the differences between flow responses measured with the cone permeameter and those predicted using the numerical model with the parameterized soil hydraulic properties is minimized to obtain the hydraulic parameter estimates. Full scale tests in a laboratory aquifer and field tests were performed during the course of this study. Excellent agreement between saturated hydraulic conductivity values obtained with the cone permeameter and values from in-situ Guelph permeameter and laboratory falling head tests was obtained. Soil moisture retention curves were similar to those obtained from multi-step outflow and capillary rise tests.

Download or read book An Approximate Method for Determining the Hydraulic Conductivity Function of Unsaturated Soil written by R. W. Skaggs and published by . This book was released on 1970 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calculation of in Situ Unsaturated Hydraulic Conductivity from Instantaneous Soil water Profile Data written by D. S. Ward and published by . This book was released on 1978 with total page 46 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 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pamphlets on Cells written by and published by . This book was released on 1900 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermal Conductivity Measurement of Liquids by a Transient Method written by David Ray Londry and published by . This book was released on 1970 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transient Measurement Techniques for the Thermogradient Coefficient and the Thermal Conductivity of Moist Soils written by Edward Bryan Gibson and published by . This book was released on 1983 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: