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Uncertainty In Soil Water Characteristic Curve And Impacts On Unsaturated Shear Strength Predictions
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Book Synopsis Uncertainty in Soil-water-characteristic Curve and Impacts on Unsaturated Shear Strength Predictions by : Claudia Elena Zapata
Download or read book Uncertainty in Soil-water-characteristic Curve and Impacts on Unsaturated Shear Strength Predictions written by Claudia Elena Zapata and published by . This book was released on 1999 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Uncertainty for Soil Water Characteristic Curve Measurements and Implications for Predicting the Hydro-mechanical Behavior of Unsaturated Soils by : Lauren Fissel
Download or read book Evaluation of Uncertainty for Soil Water Characteristic Curve Measurements and Implications for Predicting the Hydro-mechanical Behavior of Unsaturated Soils written by Lauren Fissel and published by . This book was released on 2016 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: In engineering design and classical soil mechanics, the assumption of saturated soil is the most conservative, weakest state that can be assumed. Classical soil mechanics involves the use of saturated soil parameters, including effective stress, effective cohesion, and effective friction angle. The use of unsaturated soils in design would be less conservative, but could lead to savings. Unsaturated soil mechanics also involves additional stress state variables net normal stress and matric suction. Because of the involvement of matric suction, determination of the soil water characteristic curve (SWCC) must occur simultaneously with strength testing of unsaturated soils. The calculation of unsaturated soil strength in design should have reliable reproducibility because unsaturated soil is a less conservative state. Variability in predictions of unsaturated shear strength may result do to variability in SWCC parameters. This possibility was investigated in this study, with emphasis on SWCC parameter variability. Variability of inter-specimen SWCC measurements was quantified for six soil samples. The hanging column method, an evaporation method with the UMS HYPROP apparatus, and the dew point potentiometer method provided measurement of discrete SWCC data. The van Genuchten SWCC function was parameterized using regression on data from at least 10 HYPROP trials per soil, individual measurements from the hanging column, and the same two dew point potentiometer data per soil. The HYPROP apparatus measures suction with upper and lower tensiometers within the soil specimens. Variability in water content was + 0.13 to + 0.16 at any given suction, indicating random variability in SWCC prediction despite identical specimen preparation. Variability in replicate parameter estimates for a single soil may be greater than 14% of median estimates. This result may impact testing programs that commonly rely upon a single SWCC measurement and subsequent parameterization. Additionally, this variability could affect strength testing reliant upon replicate specimen preparation. Unsaturated shear strength was predicted with a model that relies on the SWCC parameters estimated in this study. Based on this model, SWCC parameter variability resulted in minimal unsaturated strength prediction variability at suctions less than 1 kPa and increasing variability beyond this point. However, the same model failed to predict unsaturated shear strength results of this study obtained from unsaturated direct shear testing.
Book Synopsis Experimental Unsaturated Soil Mechanics by : Tom Schanz
Download or read book Experimental Unsaturated Soil Mechanics written by Tom Schanz and published by Springer Science & Business Media. This book was released on 2007-06-02 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings are a continuation of the series of International Conferences in Germany entitled "Mechanics of Unsaturated Soils." The objective is to discuss and understand unsaturated soil behaviour, so that engineered activities are improved in terms of judgement and quality. In addition to knowledge of classical concepts, it is a challenge to adapt convincing new concepts and present them in such a way that they can be used in engineering practices.
Book Synopsis Unsaturated Soils - Volume 3 by : J.F.T Juca
Download or read book Unsaturated Soils - Volume 3 written by J.F.T Juca and published by CRC Press. This book was released on 2021-05-30 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsaturated materials comprise residua, collapsible and expansive naturally occurring soils, compacted soils and, more recently, residues of solid wastes. The engineering problems associated with unsaturated materials range from those related to conventional geotechnical works (e.g. foundations, pavements, slopes and excavations, retaining structures, earthdams, irrigation canals, tunnelling, compacted embankments) to those included in the environmental area (e.g. natural slope instability, erosion and subsidence processes, tailings, residues or solid waste disposal, contaminant transport, remediation of contaminant sites, engineered barriers for environmental protection, re-use of residues). This book, published in three separate volumes, comprises a selection of selected and invited papers presented at the Third International Conference on Unsaturated Soils – UNSAT ‘2002 – that took place in Recife, Brazil, form 10th to 13th March 2002. The book is of interest to consultants, researchers, practitioners, lecturers and students with a background in geotechnical engineering, environmental engineering and engineering geology.
Book Synopsis Estimating the Soil-water Characteristic Curve Using Grain Size Analysis and Plasticity Index by : Gustavo Torres Hernandez
Download or read book Estimating the Soil-water Characteristic Curve Using Grain Size Analysis and Plasticity Index written by Gustavo Torres Hernandez and published by . This book was released on 2011 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: The infrastructure is built in Unsaturated Soils. However, the geotechnical practitioners insist in designing the structures based on Saturated Soil Mechanics. The design of structures based on unsaturated soil mechanics is desirable because it reduces cost and it is by far a more sustainable approach. The research community has identified the Soil-Water Characteristic Curve as the most important soil property when dealing with unsaturated conditions. This soil property is unpopular among practitioners because the laboratory testing takes an appreciable amount of time. Several authors have attempted predicting the Soil-Water Characteristic Curve; however, most of the published predictions are based on a very limited soil database. The National Resources Conservation Service has a vast database of engineering soil properties with more than 36,000 soils, which includes water content measurements at different levels of suctions. This database was used in this study to validate two existing models that based the Soil-Water Characteristic Curve prediction on statistical analysis. It was found that although the predictions are acceptable for some ranges of suctions; they did not performed that well for others. It was found that the first model validated was accurate for fine-grained soils, while the second model was best for granular soils. For these reasons, two models to estimate the Soil-Water Characteristic Curve are proposed. The first model estimates the fitting parameters of the Fredlund and Xing (1994) function separately and then, the predicted parameters are fitted to the Fredlund and Xing function for an overall estimate of the degree of saturation. Results show an overall improvement on the predicted values when compared to existing models. The second model is based on the relationship between the Soil-Water Characteristic Curve and the Pore-Size Distribution of the soils. The process allows for the prediction of the entire Soil-Water Characteristic Curve function and proved to be a better approximation than that used in the first attempt. Both models constitute important tools in the implementation of unsaturated soil mechanics into engineering practice due to the link of the prediction with simple and well known engineering soil properties.
Book Synopsis Unsaturated Soils: Research & Applications by : Adrian R. Russell
Download or read book Unsaturated Soils: Research & Applications written by Adrian R. Russell and published by CRC Press. This book was released on 2020-09-24 with total page 1321 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.
Book Synopsis Unsaturated Soils: Research & Applications by : Nasser Khalili
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 1850 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 Behavior - Experimentation - Modelling - Case Histories - Geotechnical Engineering Problems - Multidisciplinary and New Areas Unsaturated Soils: Research and Applications presents a wealth of information, and is of interest to researchers and practising engineers in soil mechanics and geotechnical engineering. These proceedings are dedicated to Professor Geoffrey E. Blight (1934-2013), who passed in November 2013.
Book Synopsis Review of the Empirical Equations for Predicting the Shear Strength of Unsaturated Soils by : Elizabeth A. Garven
Download or read book Review of the Empirical Equations for Predicting the Shear Strength of Unsaturated Soils written by Elizabeth A. Garven and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Practice of Bayesian Probability Theory in Geotechnical Engineering by : Wan-Huan Zhou
Download or read book Practice of Bayesian Probability Theory in Geotechnical Engineering written by Wan-Huan Zhou and published by Springer Nature. This book was released on 2020-11-13 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces systematically the application of Bayesian probabilistic approach in soil mechanics and geotechnical engineering. Four typical problems are analyzed by using Bayesian probabilistic approach, i.e., to model the effect of initial void ratio on the soil–water characteristic curve (SWCC) of unsaturated soil, to select the optimal model for the prediction of the creep behavior of soft soil under one-dimensional straining, to identify model parameters of soils and to select constitutive model of soils considering critical state concept. This book selects the simple and easy-to-understand Bayesian probabilistic algorithm, so that readers can master the Bayesian method to analyze and solve the problem in a short time. In addition, this book provides MATLAB codes for various algorithms and source codes for constitutive models so that readers can directly analyze and practice. This book is useful as a postgraduate textbook for civil engineering, hydraulic engineering, transportation, railway, engineering geology and other majors in colleges and universities, and as an elective course for senior undergraduates. It is also useful as a reference for relevant professional scientific researchers and engineers.
Book Synopsis Unsaturated Soil Mechanics in Engineering Practice by : Delwyn G. Fredlund
Download or read book Unsaturated Soil Mechanics in Engineering Practice written by Delwyn G. Fredlund and published by John Wiley & Sons. This book was released on 2012-07-30 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt: The definitive guide to unsaturated soil— from the world's experts on the subject This book builds upon and substantially updates Fredlund and Rahardjo's publication, Soil Mechanics for Unsaturated Soils, the current standard in the field of unsaturated soils. It provides readers with more thorough coverage of the state of the art of unsaturated soil behavior and better reflects the manner in which practical unsaturated soil engineering problems are solved. Retaining the fundamental physics of unsaturated soil behavior presented in the earlier book, this new publication places greater emphasis on the importance of the "soil-water characteristic curve" in solving practical engineering problems, as well as the quantification of thermal and moisture boundary conditions based on the use of weather data. Topics covered include: Theory to Practice of Unsaturated Soil Mechanics Nature and Phase Properties of Unsaturated Soil State Variables for Unsaturated Soils Measurement and Estimation of State Variables Soil-Water Characteristic Curves for Unsaturated Soils Ground Surface Moisture Flux Boundary Conditions Theory of Water Flow through Unsaturated Soils Solving Saturated/Unsaturated Water Flow Problems Air Flow through Unsaturated Soils Heat Flow Analysis for Unsaturated Soils Shear Strength of Unsaturated Soils Shear Strength Applications in Plastic and Limit Equilibrium Stress-Deformation Analysis for Unsaturated Soils Solving Stress-Deformation Problems with Unsaturated Soils Compressibility and Pore Pressure Parameters Consolidation and Swelling Processes in Unsaturated Soils Unsaturated Soil Mechanics in Engineering Practice is essential reading for geotechnical engineers, civil engineers, and undergraduate- and graduate-level civil engineering students with a focus on soil mechanics.
Book Synopsis Assessing Shear Strength of Unsaturated Soil Using Non-Experiment Methods by : Joseph Kariuki
Download or read book Assessing Shear Strength of Unsaturated Soil Using Non-Experiment Methods written by Joseph Kariuki and published by GRIN Verlag. This book was released on 2022-02-28 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research Paper (postgraduate) from the year 2022 in the subject Engineering - Mining Engineering, , language: English, abstract: This study used non-experimental approaches to evaluate the shear strength of unsaturated soil. Numerous reasons exist for considering non-experimental approaches acceptable for determining the shear strength of unsaturated soils. One of the primary reasons why non-experimental techniques might be regarded a viable option is because performing tests to determine the shear soils is a complicated and time-consuming operation. Typically, the technique entails a number of operations that need specialized equipment and the execution of methodical stages. If the findings are required quickly, the time necessary to obtain them might be harmful to the entire operation. Due to the fact that engineering processes frequently need fast results, experimental approaches may not be effective in certain circumstances.
Book Synopsis Predicting the Shear Strength Envelope of Unsaturated Soils by : DW. Rassam
Download or read book Predicting the Shear Strength Envelope of Unsaturated Soils written by DW. Rassam and published by . This book was released on 2002 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Determining the shear strength envelope of an unsaturated soil involves a sophisticated and time-consuming testing program. Hence, it is advantageous to minimize the number of tests required to establish the envelope. In this paper, a power additive function is adopted to predict the shear strength envelope of unsaturated soils from knowledge of the unsaturated shear strength at residual suction, the effective stress friction angle for saturated conditions, and the soil-water characteristic curve. Two boundary conditions are required to quantify the two fitting parameters of the function. The first is ?b = 0 at residual suction, and the second is the contribution of matric suction to the shear strength at residual suction, which should be experimentally evaluated. The validity of the method is tested for a number of unsaturated shear strength data covering a wide range of suctions. Good agreement was found to exist between the predicted envelopes and the experimental data. The method requires only one experimental evaluation of the unsaturated shear strength and is most suitable for coarse- to medium-grained soils where the residual suction may be achieved reliably in the laboratory.
Book Synopsis Evaluation of Shear Strength Functions Based on Soil Water Characteristic Curves by : GLS Babu
Download or read book Evaluation of Shear Strength Functions Based on Soil Water Characteristic Curves written by GLS Babu and published by . This book was released on 2005 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this paper is to examine the variation of shear strength with respect to suction and develop a simple method for prediction of suction from shear strength data. The measured values of total suction and the shear strength of the soils are used to predict a fitting parameter that defines the nonlinear variation of suction with shear strength. The equation proposed by Vanapalli and Fredlund is used. The parameter is estimated for two types of soils, red soil and black cotton soil, available in the state of Karnataka, using measured values of total suction and unconfined compressive strength by nonlinear regression analysis. The nonlinear equations developed between suction and unconfined shear strength are useful in unsaturated soil engineering practice.
Book Synopsis Unsaturated Soil Concepts and Their Application in Geotechnical Practice by : David G. Toll
Download or read book Unsaturated Soil Concepts and Their Application in Geotechnical Practice written by David G. Toll and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: model. They conclude that the models using three fitting parameters provide the best fit over a wide range of suctions. Models for soil-water characteristic curves are only useful if we have experimental data on which to base them. Agus, Leong and Rahardjo (Singapore) present a large number of experimental soil-water characteristic curves determined for two types of residual soil from Sigapore. They present data for eight different sites. This data set allows them to relate the parameters of the soil-water characteristic curves to index properties. They conclude that the relationships derived are suitable to pro vide a quick preliminary estimate of a soil-water characteristic curve. The importance of soil-water characteristic curves is emphasized by another con tribution dealing with this topic. Aung, Rahardjo, Leong and Toll (Singapore) inves tigate the relationship between mercury intrusion porosimetry measurements and soil-water characteristic curves. The porosimetry measurements are presented as soil-air characteristic curves. The slopes of the soil-air characteristic curves are found to be similar to the slopes of the soil-water characteristic curves. The equiv alent pore diameters calculated from the mercury entry value and the air entry value appear to be related. Therefore, it is suggested that porosimetry data can be used to construct an estimate of the soil-water characteristic curve.
Book Synopsis Smart Geotechnics for Smart Societies by : Askar Zhussupbekov
Download or read book Smart Geotechnics for Smart Societies written by Askar Zhussupbekov and published by CRC Press. This book was released on 2023-08-04 with total page 4162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart Geotechnics for Smart Societies contains the contributions presented at the 17th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering (17th ARC, Astana, Kazakhstan, 14-18 August, 2023). The topics covered include: - Geomaterials for soil improvement - Tunneling and rock engineering - Slope, embankments and dams - Shallow and deep foundations - Soil dynamics and geotechnical earthquake engineering - Geoenvironmental engineering and frost geotechnics - Investigation of foundations of historical structures and monitoring - Offshore, harbor geotechnics and GeoEnergy - Megaprojects and transportation geotechnics Smart Geotechnics for Smart Societies will be of interest to academics and engineers interested or involved in geotechnical engineering.
Book Synopsis Advances in Transportation Geotechnics IV by : Erol Tutumluer
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.
Book Synopsis Groundwater by : Muhammad Salik Javaid
Download or read book Groundwater written by Muhammad Salik Javaid and published by BoD – Books on Demand. This book was released on 2016-07-27 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water inside the earth, the groundwater and the invisible resource is the most important source of survival of mankind on this globe. Part of the hydrological cycle between entry (percolation and recharge) and exit (natural or forced extraction and discharge), the groundwater fascinates all: engineers, hydrogeologists, agriculturists, environmentalists, scientists, academia, resource managers and domestic and industrial users. This book is the outcome of efforts of those eminent authors who despite their fascination were able to write upon some important facet of groundwater flow and the transport of pollutants with it. The dimensions covered range from simple descriptive narratives; to expose of analytical methods; to complex mathematical treatment; to numerical simulations and computer modeling. All areas have been touched upon for the sake of general readers, students, professional engineers and scientists.
