Download or read book Characterization of Compacted Expansive Clays written by Julius Kibiti M'Ndegwa and published by LAP Lambert Academic Publishing. This book was released on 2011-12 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of expansive clay soil with regard to structural damage of buildings and roads was not recognized until the latter part of 1930. Up to now, some engineers are not familiar with certain characteristics of this soil. Many clay soils may be mistaken for expansive ones and costly structural designs be prepared for structures to be founded on them. Therefore, there is a need to characterize the soil for ease of identification. In this regard, Dr. M'Ndegwa points out that expansive soil can be easily identified through local climate, vegetation, ground topography, physical features of soil and simple laboratory tests. This book defines expansive soil, its occurrence, formation, mineralogical and chemical structure. The author explains the swelling behaviour of clay soil and discusses factors that influence actual amount of swell or shrinkage, concepts of swelling, modes of swelling and mechanisms of swelling. The classification and identification of this soil type including its compaction characteristics are also described. Finally, evaluation of swelling potential is discussed. Students of Civil Engineering and Practising Engineers will find this book very resourceful.

Download or read book Expansive Soils written by Amer Ali Al-Rawas and published by CRC Press. This book was released on 2006-06-08 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Expansive Soils provides the reader with easy and specific access to problems associated with expansive soils, characterisitics and treatment, and evaluation and remediation. Set up with contributions from worlwide expert, this main reference guide is intended for engineers, researchers and senior students working on soil

Download or read book Swelling Characteristics of Compacted Expansive Soils written by Narayan Venkatesh Nayak and published by . This book was released on 1971 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of the Swelling Potential of Expansive Clays Using Centrifuge Technology written by Jeffrey Albin Kuhn and published by . This book was released on 2010 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: The characterization of the swell potential of expansive clay is complicated by the fact that traditional swell testing methods require an excessive amount of time for specimens to swell to their maximum heights. As a result, the practicing engineer has typically referred to correlations between swell potential and index properties rather than directly measuring swelling in a laboratory experiment. The purpose of this study is to evaluate an alternate testing method using a geotechnical centrifuge in an attempt to decrease the time required to evaluate the swell potential of expansive clays so that expermientally obtained swelling properties may be obtained within a reasonable time period. This study includes an experimental program involving a series of tests in which compacted clay specimens are flown in a cetrifuge and their heights are monitored as water infiltrates into them.

Download or read book Advances in Characterization and Analysis of Expansive Soils and Rocks written by Laureano R. Hoyos and published by Springer. This book was released on 2017-07-11 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume includes a collection of technical papers covering two important research topics in geotechnical engineering: (1) the behavior and treatment of expansive soils, and (2) the characterization of rock properties. The twelve studies on expansive soils include investigations into novel stabilization techniques for expansive soils using different admixtures or mechanical consolidation techniques, as well as new experimental approaches to evaluate the behavior of expansive soils. They also include an evaluation of wetting boundary conditions on the volume change of expansive soils, as well as the role of hydrologic boundary conditions in arid climates. The four studies on rock properties include thermo-hydro-mechanical behavior of gypsum rock, role of rock strength in blastability, indirect methods to estimate rock strength, and variations in isotope distributions in Permian rocks. The two broad themes in this collection, as summarized above, are representative of local challenges facing geotechnical engineers in the Middle East, but their contributions can also be extended to other regions of the world. This volume is part of the proceedings of the 1st GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2017.

Download or read book Foundations on Expansive Soils written by Fu Hua Chen and published by Elsevier. This book was released on 2012-12-02 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foundations on Expansive Soils provides the practicing engineer with a summary of the state-of-the-art of expansive soils and practical solutions based on the author's experience. The book is organized into two parts. Part I deals with theory and practice, and summarizes some of the theoretical physical properties of expansive soils. It also discusses various techniques employed to found structures on expansive soils such as drilled pier foundation, mat foundation, moisture control, soil replacement, and chemical stabilization. Topics covered include the origin, mineralogical composition, and the basic structure of expansive soils; the migration of water, swelling potential, and swelling pressure; site investigations and laboratory testing; moisture control; and soil stabilization. Part II presents case studies on the following: distress caused by pier uplift; distress caused by the improper design and construction of a drilled pier foundation system; distress caused by heaving of footing pad and floor slab; distress caused by heaving of continuous footings; and distress caused by a rise of ground water.

Download or read book Expansive Soils written by Amer Ali Al-Rawas and published by Taylor & Francis. This book was released on 2006-06-08 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Expansive Soils provides the reader with easy and specific access to problems associated with expansive soils, characterisitics and treatment, and evaluation and remediation. Set up with contributions from worlwide expert, this main reference guide is intended for engineers, researchers and senior students working on soil

Download or read book A Stress Controlled Study of Swelling Characteristics of Compacted Expansive Clays written by V. Dakshanamurthy and published by . This book was released on 1979 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The swelling characteristics of statically compacted expansive clays subjected to given isotropic and anisotropic stress conditions were investigated with a triaxial cell apparatus. A unique relationship was found between maximum volumetric swelling and mean normal stresses. From this relationship one can determine a null swelling pressure that will cause neither swelling nor compression or consolidation or both. It was also determined that the maximum axial and radial swelling decrease exponentially with increase in mean normal stress; this relationship is dependent on the principal stress ratio. The swelling ratio (defined as the ratio of axial swelling to radial swelling) was found to decrease with time allowed for swelling, reaching an equilibrium value termed the equilibrium swelling ratio, which is a function of the boundary loading conditions.

Download or read book Laboratory Manual for Geotechnical Characterization of Fine Grained Soils written by Alan J. Lutenegger and published by CRC Press. This book was released on 2023-06-20 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual presents procedures for performing advanced laboratory tests on fine-grained soils. It covers characterization tests, which determine soil composition and quantify the individual components of a soil, and behavioral tests, such as the Atterberg Limits tests that demonstrate how the fines fraction of a soil reacts when mixed with water and the Linear Shrinkage Test that demonstrates how much a soil shrinks. The material goes beyond traditional evaluation of basic soil behavior by presenting more advanced laboratory tests to characterize soil in more detail. These tests provide detailed compositional characteristics which identify subtle changes in conditions and vertical variations in the soil, and which help to explain unusual behavior. A unique compilation of information on key soil tests Combines characterization tests with behavior tests The book suits graduate students in geotechnical engineering, as well as practitioners and researchers.

Download or read book Characterization of the Swelling Behavior of Expansive Clays Using Centrifuge Technology written by Nicolas Alejandro Rivas and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental techniques with emphasis in centrifuge testing were implemented to characterize the swelling behavior of expansive clays. This research consisted in three self-contained sections related to the study of different aspects of expansive clays. The first research component focused on the implementation of a qualitative mineralogy analysis performed using x-ray diffraction to determine the main clay minerals in an expansive soil. The analysis was performed on the clay-sized fraction of the soil and samples with preferential and random orientation were used in the analysis. Vacuum filtration was used to produce oriented samples in order to maximize the intensity of the diagnostic basal spacing of the clay minerals, and samples were subjected to different treatments to produce changes in the basal spacing or crystalline structure of the clay minerals to facilitate their identification. The second research component examined the effect of the coarse fraction on the swelling characteristics of expansive soils using a centrifuge-based approach. Vertical strains at the end of primary swelling were evaluated for different proportions of coarse fraction by volume. It was found that the magnitude of vertical strains at the end of primary swelling decreased with increasing coarse fraction. It was concluded that the swelling depended uniquely on the ratio between the volume of soil solids of the fine fraction and the volume of voids. Additionally, when correcting the initial void ratio of the specimens to account for this, the relationship between vertical strains at the end of primary swelling and initial void ratio for the soil mixtures defines a unique linear trend with the baseline material. The third research component examined the potential vertical rise at three field sites in Central Texas. Method 6048-A was applied to evaluate the PVR of three field sites using direct measurements of the swelling characteristics of soils sampled at each location. Project-specific data was generated in a relatively short time using this centrifuge-based method. The results obtained demonstrated the need for testing of project-specific samples, as a significant variation in PVR was observed in Site 2 and 3 between boring locations, while less variation between borings was found in Site 1

Download or read book Foundation Engineering Handbook written by Hsai-Yang Fang and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 935 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than ten years have passed since the first edition was published. During that period there have been a substantial number of changes in geotechnical engineering, especially in the applications of foundation engineering. As the world population increases, more land is needed and many soil deposits previously deemed unsuitable for residential housing or other construction projects are now being used. Such areas include problematic soil regions, mining subsidence areas, and sanitary landfills. To overcome the problems associated with these natural or man-made soil deposits, new and improved methods of analysis, design, and implementation are needed in foundation construction. As society develops and living standards rise, tall buildings, transportation facilities, and industrial complexes are increasingly being built. Because of the heavy design loads and the complicated environments, the traditional design concepts, construction materials, methods, and equipment also need improvement. Further, recent energy and material shortages have caused additional burdens on the engineering profession and brought about the need to seek alternative or cost-saving methods for foundation design and construction.

Download or read book Soil Behavior and Characterization of Geomaterials written by Kasinathan Muthukkumaran and published by Springer Nature. This book was released on 2022-11-30 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the select peer-reviewed proceedings of the Indian Geotechnical Conference (IGC) 2021. The contents focus on Geotechnics for Infrastructure Development and Innovative Applications. The book covers topics related to soil behavior and characterization of geomaterials, geotechnical, geological, and geophysical investigation of special topics such as behavior of unsaturated soils, offshore and marine geotechnics, remote sensing and GIS, instrumentation and monitoring, retrofitting of geotechnical structures, reliability in geotechnical engineering, geotechnical education, codes and standards, among others. This volume will be of interest to those in academia and industry.

Download or read book Numerical Modeling Characterization and Monitoring of the Seasonal Behavior of Expansive Clays written by Ivo Rosa Montenegro and published by . This book was released on 2020 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seasonal ground movements associated with the swelling and shrinking of expansive clays represent a major cause of damage to buildings, roads, and pipelines. The processes that give rise to these movements involve complex ground-atmosphere interactions (due to combined effects of infiltration and evaporation), combined with highly non-linear hydraulic and mechanical properties of partially saturated clay. This thesis presents an integrated study to measure and interpret long-term ground movements at a greenfield test site in Mustang Ridge (MR), Texas, adjacent to toll road SH130. The site is underlain by almost 12 m of high plasticity (montmorillonite-rich) clay. We designed and installed an autonomous field station that measures local weather conditions together with sub-surface water contents, using WCR reflectometers, and deformations, through a novel system of string-pot potentiometers. We have obtained online data from the site for more than 3 years and observed a seasonal range of 50 mm in ground surface movements. We have investigated the engineering properties of the MR clay using samples extracted during site investigation and lab tests on compacted specimens of blended/reconstituted clay. These data are then used to calibrate constitutive models of suction-water content (SWCC), hydraulic conductivity and 1D compressibility for the MR clay. Numerical analyses of non-linear coupled flow-deformation in the partially-saturated soil column has been carried using a customized finite difference and finite volume framework (MPME) implemented within MATLAB. The MPME framework enables the representation of specified atmospheric boundary conditions (either as specified fluid pressures or fluxes) and hence, can simulate periods dominated by rainfall-induced infiltration or net drying by evapotranspiration. Parametric MPME analyses are used to interpret field measurements at the test site to explain seasonal fluctuations in average strains and water contents and hence, to interpret the active depth in the MR clay. The results show that surface cracks influence the transient response of ground movements by significantly increasing the hydraulic conductivity of the medium. This feature affects the response rate of soil deformations to atmospheric phenomena. This behavior was simulated through the use of a constitutive model proposed by Stewart et al. (2016a) that quantifies the development of desiccation cracking. By improving our understanding of sources of seasonal ground movements, the research provides the basis for a more robust design of foundations and roadbeds in areas underlain by expansive clays.

Download or read book Advances in Transportation Geotechnics IV written by Erol Tutumluer and published by Springer Nature. This book was released on 2021-09-16 with total page 1059 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents selected papers presented during the 4th International Conference on Transportation Geotechnics. The papers address the geotechnical challenges in design, construction, maintenance, monitoring, and upgrading of roads, railways, airfields, and harbor facilities and other ground transportation infrastructure with the goal of providing safe, economic, environmental, reliable and sustainable infrastructures. This volume will be of interest to postgraduate students, academics, researchers, and consultants working in the field of civil and transport infrastructure.

Download or read book Technical Report S written by and published by . This book was released on 1968 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of the Rate of Secondary Swelling in Expansive Clays Using Centrifuge Technology written by Jasaswee Triyambak Das and published by . This book was released on 2014 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Expansive soils are characterized as having high amount of clay minerals such as smectite, which lead to swelling during wet seasons by absorbing water and shrinking during dry seasons owing to moisture loss by evapotranspiration. The soil volumetric changes due to moisture fluctuations cause extensive damage to civil engineering structures, namely pavements, retaining walls, low rise buildings and canals founded on such soils. The primary swelling portion of the swell curve has been studied in significant details in previous studies. However, there is a dearth of literature concerning the secondary swelling phenomenon in expansive clays, which has also been observed in experimental studies. While it may be argued that the magnitude of secondary swelling is significantly less as compared to primary swelling, the characterization of the rate of secondary swelling is relevant for fully characterizing the swell potential of the soil. The rate of secondary swelling has been used to predict the long-term swelling of expansive soils. Conventional laboratory swell tests may take over a month for specimens to demonstrate secondary swelling behavior. A centrifuge based method has been recently developed at The University of Texas at Austin to achieve this objective in multiple specimens, and within less than a day. The effects of soil fabric, soil type, relative compaction, molding water content, gravitational gradient, and infiltrating fluid, on the rate of secondary swelling, are thoroughly investigated in this thesis. Four different expansive clays found widely in and around Texas, namely - Eagle Ford Clay, Tan Taylor Clay, Black Taylor Clay and Houston Black Clay, have been used in the study. Based on this extensive experimental evaluation, it may be concluded that secondary swelling behavior could be explained by flow processes associated with the bimodal pore size distribution in expansive clays. The rate of secondary swelling was found to increase with increasing molding water content and increasing compaction dry unit weight. The experimental results revealed that clays with a flocculated structure (compacted dry of optimum) demonstrate rapid primary swelling but exhibit less swelling in the secondary region, as compared to clays with a dispersed structure (compacted wet of optimum). The slope of secondary swelling showed a decline with increasing gravitational gradient. The rate of secondary swelling showed evidence of upward trend with an increase in the plasticity index and clay fraction of the soil. It was observed that soils which exhibit higher primary swelling also demonstrate higher secondary swelling.

Download or read book Stress Deformation Characteristics of Compacted Clays written by Partha Sircar and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: