Download or read book Desiccation in Clay Soils written by Construction Research Communications Ltd and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Desiccation in clay soils can result in shrinkage of the soil and subsidence of the ground; this may lead to damage to buildings. As the soil re-hydrates, it can swell, resulting in ground heave; this may also cause damage to buildings. In many ground investigations, it is important to establish the extent and depth of any desiccation but this is not always easy. This Digest describes the most commonly used techniques for detecting desiccation and gives guidance on how to use the results of some of these techniques to estimate heave potential.

Download or read book A Method of Determining the State of Desiccation in Clay Soils written by M. S. Crilly and published by . This book was released on 1993 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The filter-paper method of soil suction determination to establish the state of desiccation in clay soil profiles is increasingly used but is not, as yet, included in the British Standard (BS 1377) for soil testing. This paper provides guidance for carrying out this test on both undisturbed and disturbed soil samples. It is intended for geotechnical engineers and soils testing technicians.

Download or read book Encyclopedia of Engineering Geology written by Peter T. Bobrowsky and published by Springer. This book was released on 2018-08-03 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume addresses the multi-disciplinary topic of engineering geology and the environment, one of the fastest growing, most relevant and applied fields of research and study within the geosciences. It covers the fundamentals of geology and engineering where the two fields overlap and, in addition, highlights specialized topics that address principles, concepts and paradigms of the discipline, including operational terms, materials, tools, techniques and methods as well as processes, procedures and implications. A number of well known and respected international experts contributed to this authoritative volume, thereby ensuring proper geographic representation, professional credibility and reliability. This superb volume provides a dependable and ready source of information on approximately 300 topical entries relevant to all aspects of engineering geology. Extensive illustrations, figures, images, tables and detailed bibliographic citations ensure that the comprehensively defined contributions are broadly and clearly explained. The Encyclopedia of Engineering Geology provides a ready source of reference for several fields of study and practice including civil engineers, geologists, physical geographers, architects, hazards specialists, hydrologists, geotechnicians, geophysicists, geomorphologists, planners, resource explorers, and many others. As a key library reference, this book is an essential technical source for undergraduate and graduate students in their research. Teachers/professors can rely on it as the final authority and the first source of reference on engineering geology related studies as it provides an exceptional resource to train and educate the next generation of practitioners.

Download or read book Multiphysical Testing of Soils and Shales written by Lyesse Laloui and published by Springer Science & Business Media. This book was released on 2012-08-22 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant advancements in the experimental analysis of soils and shales have been achieved during the last few decades. Outstanding progress in the field has led to the theoretical development of geomechanical theories and important engineering applications. This book provides the reader with an overview of recent advances in a variety of advanced experimental techniques and results for the analysis of the behaviour of geomaterials under multiphysical testing conditions. Modern trends in experimental geomechanics for soils and shales are discussed, including testing materials in variably saturated conditions, non-isothermal experiments, micro-scale investigations and image analysis techniques. Six theme papers from leading researchers in experimental geomechanics are also included. This book is intended for postgraduate students, researchers and practitioners in fields where multiphysical testing of soils and shales plays a fundamental role, such as unsaturated soil and rock mechanics, petroleum engineering, nuclear waste storage engineering, unconventional energy resources and CO2 geological sequestration.

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 Study of Desiccation Cracking and Fracture Properties of Clay Soils written by Warnakulasuriya D Susanga M Costa and published by . This book was released on 2010 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis focuses on the development of shrinkage cracking in clay soils upon drying and the determination of fracture properties of clay soils as applicable to analysis of desiccation cracking phenomenon. The results and conclusions were drawn from comprehensive experimental work analysed drawing from Classical Soil Mechanics, Fracture Mechanics, Unsaturated Soil Mechanics and Mechanics of Materials with the aid of powerful image analysis techniques. Attempts were made to fill the gaps in the existing knowledge related to scope of the thesis as identified by a detailed study on the previous works. Three types of soils were used for the work presented in this thesis: Merri-Creek clay, Werribee clay and milled fine sand. The former two are naturally available materials in the Melbourne region. The last material was sourced from a commercial dealer. Potato starch was also used in desiccation tests as an alternative material to examine the crack patterns different from clays. Qualitative and quantitative studies were carried out using these materials aiming to acquire deeper understanding of the cracking mechanisms. Effects of desiccation rate, specimen thickness and particle size on crack patterns were studied. The influence of stress distribution and flaw distribution on crack initiation was also discussed. Image analysis techniques were used extensively to investigate the deformations of soil particles during drying. Shrinkage characteristics and onset of crack initiation were closely studied with displacement vector fields and strain isochrones. Interesting observations were made during these studies which led to deeper understanding of the subject, especially in relation to the mechanisms of crack initiation and associated modelling approaches. Fracture properties of Werribee clay was investigated using SENB beam test. Fracture toughness, fracture energy of Werribee clay was measured using three methods. An attempt was made to explain the behaviour of these parameters with the water content. Finally, an innovative test method to determine the J-integral was introduced. The test is specially designed to determine the J-integral of desiccating soils.

Download or read book A Short Course in Geotechnical Site Investigation written by N. E. Simons and published by Thomas Telford. This book was released on 2002-10-21 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Folded card: Identification and description of soils; and, Identification and description of rocks / designed by Environmental Services Group Limited 2007 in accordance with BS EN ISO 14689-1 and BS EN ISO 14688-1 respectively; and designed to be taken into the field during the walk-over survey.

Download or read book Unsaturated Soils for Asia written by H. Raharjdo and published by CRC Press. This book was released on 2020-09-10 with total page 873 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of articles from the Asian conference UNSAT-ASIA 2000, covering topics such as: historical developments; numerical modelling; suction measurement techniques; permeability and flow; mass transport; and engineering applications.

Download or read book Numerical Simulation of Shrinkage and Cracks in Clayey Soils on Drying Paths written by Wenqing Cheng and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Clay soil is widely distributed on the Earth's surface, and because it is cheap and readily available, clay soil has been widely used as a building material for a very long history. Furthermore, clay can be used as not only a natural barrier in the dam cores, but also a matrix for the storage of radioactive wastes because of its retention properties. The mechanical behavior of clay materials is complex, one of the difficulties is that it is sensitive to water. During the desiccation process, clay soils undergo shrinkage, which can cause cracking. The aim of this thesis is, initially, to develop a numerical approach capable of reproducing the phenomenon of shrinkage, the distribution of water content as well as that of suction. In a second step, based on Coussy's theory for unsaturated porous media, and the mechanics of unsaturated soils, a constitutive law will be proposed to describe the behavior observed during desiccation. Finally, to reproduce the cracks distribution, based on the extended finite element method (X-FEM). The realization of numerical simulation is based on the analysis of the desiccation experiments of clay soils in laboratory. The application of the digital image correlation (DIC) technology in the desiccation experiments makes the study on the desiccation process in clay soils more accurate. The experimental results show that the clay soils will generate the theoretical shrinkage deformation caused by its own water loss in the drying path. This deformation in simulation can be related to the water content of clays through the Fredlund function. The desiccation shrinkage of clay soils has an anisotropic phenomenon. The coefficient of shrinkage ratio is used to describe this phenomenon in simulation. One of the ways to construct the constitutive of the initially saturated soft clays during drying could be in using two independent stress tensors which will enable the decomposition of total strain tensor into strain tensor due to drying shrinkage (induced part due to suction variation) and a “mechanical” strain tensor due to the total stress variation. Mechanical strain tensor can be related to total stress by using stiffness matrix. In fact, the initially saturated clay soil resistance increases during desiccation. The result of cracking in the soil under controlled suction is the result of competitions between increased soil resistance and damage caused by shrinkage during desiccation. The soil moisture crack initiation criterion will be based on soil damage and resistance. The criterion of crack propagation, meanwhile, will be based on the theory of conservation of energy. To reproduce the cracks distribution, based on X-FEM. Weibull's law will be used to consider the heterogeneous distribution of the soil. After digital model validation, applications in the geotechnical field are then considered.

Download or read book Has Your House Got Cracks written by Tim J. Freeman and published by Thomas Telford. This book was released on 1994 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide explains why properties founded on clay soils suffer from cracking and provides practical, step-by-step advice and guidance to the home owner on what action, if any, should be taken when confronted by subsidence. It answers key questions, such as how to reduce the risk of damage or prevent existing damage from worsening.

Download or read book Has Your House Got Cracks written by Tim Freeman and published by Thomas Telford. This book was released on 2002 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing practical guidance for homeowners whose properties have been affected by subsidence, or heave, or who are concerned by the potential risk of damage, this second edition has been expanded to include sections on other types of subsidence and causes of damage that are unrelated to foundation movement.

Download or read book Effectivenes of Desiccation in Densifying a Series of Sand clay Mixtures written by Howard F. Donley and published by . This book was released on 1961 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Indian Geotechnical Conference 2019 written by Satyajit Patel and published by Springer Nature. This book was released on 2021-06-04 with total page 779 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select proceedings of the annual conference of the Indian Geotechnical Society. The conference brings together research and case histories on various aspects of geotechnical and geoenvironmental engineering. The book presents papers on geotechnical applications and case histories, covering topics such as (i) Characterization of Geomaterials and Physical Modelling; (ii) Foundations and Deep Excavations; (iii) Soil Stabilization and Ground Improvement; (iv) Geoenvironmental Engineering and Waste Material Utilization; (v) Soil Dynamics and Earthquake Geotechnical Engineering; (vi) Earth Retaining Structures, Dams and Embankments; (vii) Slope Stability and Landslides; (viii) Transportation Geotechnics; (ix) Geosynthetics Applications; (x) Computational, Analytical and Numerical Modelling; (xi) Rock Engineering, Tunnelling and Underground Constructions; (xii) Forensic Geotechnical Engineering and Case Studies; and (xiii) Others Topics: Behaviour of Unsaturated Soils, Offshore and Marine Geotechnics, Remote Sensing and GIS, Field Investigations, Instrumentation and Monitoring, Retrofitting of Geotechnical Structures, Reliability in Geotechnical Engineering, Geotechnical Education, Codes and Standards, and other relevant topics. The contents of this book are of interest to researchers and practicing engineers alike.

Download or read book Research Developments in Geotechnics Geo Informatics and Remote Sensing written by Hesham El-Askary and published by Springer Nature. This book was released on 2022-02-21 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the best peer-reviewed papers accepted for presentation at the 2nd Springer Conference of the Arabian Journal of Geosciences (CAJG-2), organized in Sousse, Tunisia, in November 2019. The short papers cover various topics from the fields of (1) geological and geotechnical engineering, (2) geomechanical studies based on numerical and analytical methods, and (3) geo-informatics and remote sensing. The content of these papers provides new scientific knowledge for further understanding on landslides, new stabilization techniques, importance of geophysics for engineering geology investigations as well as new empirical approaches for easily predicting some physical and hydrogeomechanical properties of geomaterials. The book is of interest to all researchers, practitioners, and students in the fields of geological and mining engineering, geotechnical engineering, hydrogeomechanics, engineering geology, geotechnologies, and natural hazards.

Download or read book Modelling of Desiccation Crack Depths in Clay Soils written by Rathnayaka Mudiyanselage Sasika Dilrukshi Wijesooriya and published by . This book was released on 2012 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Desiccation cracking is a major problem in many fields. In addition to introducing speedy pathways for water ingress, cracks can also compromise the structural integrity of the geo structures. In this regard, prediction of the depth of cracking is an important aspect in evaluating system performance. Modelling of desiccation cracks is a major concern for the past few decades. Despite the numerous attempts to model the crack depths, no comprehensive modelling method is available. In this study, an attempt has been made to model the desiccation crack depths using analytical and numerical approaches.The thesis presents a review of the literature identifying the gaps of the knowledge in this field, numerical modelling of desiccation crack depths under various conditions for different soils and laboratory experimentation to support the numerical model. The existing theoretical methods used to analyse desiccation crack depths and new methods have been developed to describe the predictions from the numerical program. Further the cyclic change of climate conditions are considered for developing the numerical model. Finally a new approach is used to predict the crack depths in which moisture content change was used instead of suction. Finally a more rigorous approach of predicting crack depths incorporating cohesive properties at the crack is presented using the computer program UDEC.The results from the numerical approach are presented and discussed in the thesis. The crack depths are compared with either theoretical results or a bench-mark model, highlighting pros and cons of current approaches. More accurate crack depths agreeing with the published field observation data can be predicted when using the moisture content change instead of suction as a model parameter. Furthermore, cohesive properties of the crack should be considered for fracture modelling provided that soils are not subjected to extreme dry conditions.However, it is recommended to conduct comprehensive field experimentation to measure the desiccation crack depths and compare the results with the numerical modelling predictions of the same soil in same field conditions to draw fully validated conclusions.

Download or read book Desiccation Cracks and their Patterns written by Lucas Goehring and published by John Wiley & Sons. This book was released on 2016-03-09 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bringing together basic ideas, classical theories, recent experimental and theoretical aspects, this book explains desiccation cracks from simple, easily-comprehensible cases to more complex, applied situations. The ideal team of authors, combining experimental and theoretical backgrounds, and with experience in both physical and earth sciences, discuss how the study of cracks can lead to the design of crack-resistant materials, as well as how cracks can be grown to generate patterned surfaces at the nano- and micro-scales. Important research and recent developments on tailoring desiccation cracks by different methods are covered, supported by straightforward, yet deep theoretical models. Intended for a broad readership spanning physics, materials science, and engineering to the geosciences, the book also includes additional reading especially for students engaged in pattern formation research.

Download or read book Assessment of the Performance of Engineered Waste Containment Barriers written by National Research Council and published by National Academies Press. This book was released on 2007-09-22 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: President Carter's 1980 declaration of a state of emergency at Love Canal, New York, recognized that residents' health had been affected by nearby chemical waste sites. The Resource Conservation and Recovery Act, enacted in 1976, ushered in a new era of waste management disposal designed to protect the public from harm. It required that modern waste containment systems use "engineered" barriers designed to isolate hazardous and toxic wastes and prevent them from seeping into the environment. These containment systems are now employed at thousands of waste sites around the United States, and their effectiveness must be continually monitored. Assessment of the Performance of Engineered Waste Containment Barriers assesses the performance of waste containment barriers to date. Existing data suggest that waste containment systems with liners and covers, when constructed and maintained in accordance with current regulations, are performing well thus far. However, they have not been in existence long enough to assess long-term (postclosure) performance, which may extend for hundreds of years. The book makes recommendations on how to improve future assessments and increase confidence in predictions of barrier system performance which will be of interest to policy makers, environmental interest groups, industrial waste producers, and industrial waste management industry.