Download or read book Laboratory Evaluation of Coefficient of Radial Consolidation Based on Pore Water Pressure Dissipation and Settlement written by Buddhima Indraratna and published by . This book was released on 2012 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modified and standard Rowe consolidation cells were employed to investigate the behaviour of soft clays during vacuum assisted radial consolidation. Degree of consolidation (DOC) and the back calculated value of coefficient of radial consolidation (ch) based on measured settlement and excess pore-water-pressure (uw) dissipation curves were compared. The DOC and (ch) based on pore water pressures are shown to be less than those based on settlements. The vacuum pressure-total surcharge ratio (VSR) is found to be an important parameter controlling the rate of the consolidation. Moreover, the coefficient of radial consolidation (ch) based on conventional oedometer testing could not accurately predict the consolidation behaviour of soft soils under varying VSR. Finally, a semi-empirical model incorporating the relationship between VSR and a modified coefficient of radial consolidation is introduced.
Download or read book Full Match Method to Determine the Coefficient of Radial Consolidation written by S. G. Chung and published by . This book was released on 2019 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents a novel approach to determine the coefficient of consolidation (ch), which represents the complete behavior of primary consolidation while instantaneously loading consolidation tests with central drainage (CD) and peripheral drainage (PD) The entire consolidation range (i.e., ultimate settlement ?ult) was graphically determined using settlement rate variations, and then ch was obtained by best fitting such data range with 2-D theoretical solutions. The proposed method and 11 existing methods were applied to 15 existing test data. The applicability of the estimated ?ult and ch values was verified via back analysis. Results indicate that the errors between the back-analyzed and measured settlements are within a maximum of 7 % in the case of the proposed method but within a maximum of over 50 % in the case of existing methods. Thus, the ch values obtained using existing methods on the CD and PD test results varied within the range of 60120 % and 5070 %, respectively, of those of the proposed method. Such substantial underestimation or overestimation was mainly attributed to the variations between the theoretical and experimental timesettlement relationships, incorrectly determined ?ult, and limitations in graphical procedures.
Download or read book Challenges and Innovations in Geomechanics written by Marco Barla and published by Springer Nature. This book was released on 2021-01-14 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the latest advances, innovations, and applications in the field of computational geomechanics, as presented by international researchers and engineers at the 16th International Conference of the International Association for Computer Methods and Advances in Geomechanics (IACMAG 2020/21). Contributions include a wide range of topics in geomechanics such as: monitoring and remote sensing, multiphase modelling, reliability and risk analysis, surface structures, deep structures, dams and earth structures, coastal engineering, mining engineering, earthquake and dynamics, soil-atmosphere interaction, ice mechanics, landfills and waste disposal, gas and petroleum engineering, geothermal energy, offshore technology, energy geostructures, geomechanical numerical models and computational rail geotechnics.
Download or read book Consolidation of Soils written by Frank C. Townsend and published by ASTM International. This book was released on 1986 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Radial Consolidation Test Data Using a Log log Method written by Retnamony G. Robinson and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vertical drains are extensively used to accelerate the consolidation of soft clay deposits. Barron's theory is usually used to analyze this problem, in which the drainage occurs in the radial direction. The important input parameter in Barron's theory is the coefficient of radial consolidation (cr) and a rational assessment of cr is necessary for the economic design of vertical drains. While several methods exist for the determination of the coefficient of consolidation (cv) under vertical drainage, very few methods are available for the determination of cr. In this paper, a log-log method is proposed for the determination of cr from the experimental data obtained from consolidation tests under radial drainage, based on the characteristic feature observed from a log Ur versus log Tr plot for the equal strain condition. The validity of the method is evaluated by comparing the experimental data with the theory and comparing with the existing methods, such as the t method and the inflection point method. In addition, the parameters obtained based on the proposed method are used to analyze a large-scale experiment with a prefabricated vertical drain.
Download or read book Ground Improvement Techniques and Geosynthetics written by T Thyagaraj and published by Springer. This book was released on 2018-09-01 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book comprises select proceedings of the 2016 annual conference of the Indian Geotechnical Society (IGC 2016), with technical papers on the theme “Ground Improvement and Geosynthetics”. The papers cover a wide range of topics, including chemical modification using admixtures, microbial-induced carbonate precipitation, geopolymers, fly ash and other industrial wastes, modification using geosynthetic materials such as natural and synthetic fibers, expanded polystyrene (EPS) geofoam, prefabricated vertical drains, geosynthetic encased-granular columns and mechanical densification through sand columns. This book is a valuable reference for researchers and practicing engineers alike.
Download or read book Settlement Rate Settlement Method for Radial Consolidation SRSM RC written by Mohammed Shukri Al-Zoubi and published by . This book was released on 2014 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The settlement rate-settlement method for radial consolidation (SRSM-RC) is proposed for evaluating the coefficient of radial consolidation cr and end-of-primary (EOP) settlement ?p. The SRSM-RC explicitly relates cr and ?p to the intercept and slope of the linear settlement rate-settlement (d?t/dt-?t) relationship observed theoretically over the entire Ur range of the Barron theory; ?t is the settlement at time t and Ur is the degree of radial consolidation. The SRSM-RC computes cr independently of any specific Ur value and can simultaneously compute ?p without the need to use the secondary compression range. The SRSM-RC does not require a complete record of compression-time data; a minimum of four representative data points at any stage of primary consolidation are required to estimate cr by the SRSM-RC. Experimental results on radial consolidation of several clayey soils obtained from literature are used to validate and compare the SRSM-RC with existing methods. The validity of the method is also evaluated by matching the experimental compression-time data with the theory.
Download or read book Ground Improvement written by Professor Jian Chu and published by Elsevier. This book was released on 2005-11-07 with total page 1137 pages. Available in PDF, EPUB and Kindle. Book excerpt: - The first book of its kind, providing over thirty real-life case studies of ground improvement projects selected by the worlds top experts in ground improvement from around the globe. - Volume 3 of the highly regarded Elsevier Geo-engineering book series coordinated by the Series Editor: Professor John A Hudson FREng. - An extremely reader friendly chapter format. - Discusses wider economical and environmental issues facing scientists in the ground improvement.Ground improvement has been both a science and art, with significant developments observed through ancient history. From the use of straw as blended infill with soils for additional strength during the ancient Roman civilizations, and the use of elephants for compaction of earth dams during the early Asian civilizations, the concepts of reinforced earth with geosynthetics, use of electrokinetics and thermal modifications of soils have come a long way. The use of large and stiff stone columns and subsequent sand drains in the past has now been replaced by quicker to install and more effective prefabricated vertical drains, which have also eliminated the need for more expensive soil improvement methods.The early selection and application of the most appropriate ground improvement techniques can improve considerably not only the design and performance of foundations and earth structures, including embankments, cut slopes, roads, railways and tailings dams, but also result in their cost-effectiveness. Ground improvement works have become increasingly challenging when more and more problematic soils and marginal land have to be utilized for infrastructure development.This edited compilation contains a collection of Chapters from invited experts in various areas of ground improvement, who have illustrated the basic concepts and the applications of different ground improvement techniques using real projects that they have been involved in. The case histories from many countries ranging from Asia, America, Australia and Europe are addressed.
Download or read book Soft Soil Engineering written by Dave H. Chan and published by CRC Press. This book was released on 2006-09-28 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soft soils present particular challenges to engineers and an understanding of the specific characteristics of these soils is indispensable. Laboratory techniques such as numerical modelling, theoretical analysis and constitutive modelling give new insights into soft soil material behaviour, while large-scale testing in the field provides important information in areas such as slope stability and soft soil improvements. This collection of papers from the Fourth International Conference on Soft Soil Engineering, Vancouver, 2006, presents an international appraisal of current research and new advances in engineering practices, illustrating the theory with relevant case studies. Geotechnical professionals, engineers, academics and researchers working in the areas of soft ground engineering and soft soil engineering will find this a valuable book.
Download or read book Consolidation Behavior of Clayey Soils Under Radial Drainage written by A. Sridharan and published by . This book was released on 1996 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: For Barron's degree of consolidation, Ur, versus the time factor, Tr, relationship for soils undergoing consolidation with radial drainage for the equal vertical strain condition, a simple method has been developed to determine the value of the coefficient of consolidation with radial drainage, cr. Theoretical log10(d2e/t) versus Ur curves where de is the diameter of influence and t is the real time for the different known value of cr have been generated. A method has been developed wherein both the theoretical and experimental behaviors of soils undergoing consolidation with radial drainage can be simultaneously compared and studied on the same plot. The experimental log10(d2e/t) versus Ur curves have been compared with the theoretical curves. Effects of initial compression, secondary compression, and duration of load increment are studied. Simple procedures are presented for calculating the values of cr using the experimental log10(d2e/t) versus Ur curves. A comparative study of the coefficient of consolidation and the coefficient of permeability between the cases of vertical and radial drainage has been done.
Download or read book Inflection Point Method to Estimate Ch From Radial Consolidation Tests with Peripheral Drain written by Dhanya Ganesalingam and published by . This book was released on 2013 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Horizontal coefficient of consolidation ch is a key parameter in the design of vertical drains and the following consolidation analysis of a soil layer. There are graphical and non-graphical methods available to estimate ch from laboratory radial consolidation tests with a central drain. Currently, the consolidation tests with peripheral drains have to be analysed through a curve fitting method for determining ch. In this technical note, a non-graphical inflection point method is proposed for determining ch for an oedometer test with peripheral drainage, based on the characteristic feature observed when the gradient of the theoretical Ur -log Tr relationship was plotted against Tr. The proposed method is validated through a series of consolidation tests on two reconstituted dredged clay specimens, tested in an oedometer subjected to radial drainage with peripheral drains. The consolidation settlements predicted from the proposed method, for the two different clays, were in excellent agreement with those measured in the oedometer. The proposed method will be a very valuable tool in the analysis of radial consolidation data when the drains are peripheral.
Download or read book Structural Health Monitoring and Engineering Structures written by Tinh Quoc Bui and published by Springer Nature. This book was released on 2021-06-10 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the select proceedings of International Conference on Structural Health Monitoring and Engineering Structures (SHM&ES) 2020. It brings together different applied and technological aspects of structural health monitoring. The main topics covered in this book include damage assessment, structural health monitoring, engineering fracture mechanics, Inverse problem using optimization techniques, machine learning, deep learning, Artificial intelligent and non-destructive evaluation. It will be a reference for professionals and students in the areas of civil engineering, applied natural sciences and engineering management.
Download or read book The Pressuremeter written by Jean-Louis Briaud and published by Routledge. This book was released on 2019-07-16 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: This classic title deals presents all one needs to know about pressuremeter test, a soil and rock test used in civil engineering. It consists of placing a cylindrical probe in the ground and expanding the probe to pressurize the soil or the rock horizontally. The pressure on the soil and the relative increase in cavity radius are obtained and give an in situ stress strain curve. The pressuremeter test is repeated at various depths in order to obtain profiles of soil parameters. The design applications of the preboring pressuremeter test include: shallow foundations under vertical loads, deep foundations under vertical and horizontal loads, ground anchors, cantilever drilled shaft walls and anchored bulkheads, pavements, stone columns, ground improvement and compaction control.
Download or read book Constant Rate of Strain Consolidation with Radial Drainage written by TH. Seah and published by . This book was released on 2003 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a method of determining the consolidation characteristics of soft Bangkok clay under the radial drainage condition by using a newly developed constant rate of strain (CRS) consolidometer. A new formulation for this type of test was proposed. A series of constant rate-of-strain consolidation tests were compared to the results of oedometer tests. The pore water pressure distribution across the specimen in the CRS tests was estimated from measurements made at two locations. The results agreed well with the theoretical solution. A simple method of estimating the preconsolidation pressure by means of the pore water pressure ratio is also proposed. Because the tests conducted at different strain rates indicate that apparent preconsolidation pressure increases with strain rate, it is believed that secondary compression occurred during primary consolidation for this clay. The consolidation characteristics, including coefficient of consolidation and coefficient of permeability, in the vertical and horizontal directions were also compared.
Download or read book Geotechnical and Foundation Engineering Practice in Industrial Projects written by Mihir Roy and published by Springer Nature. This book was released on 2024-02-05 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: This professional book is an important resource on the topics of geotechnical and foundation engineering for practicing engineers and consultants. It fills the gap between classroom education and real-world professional practice in green and brown field projects. It provides hands-on knowledge on various topics such as engineering geology, geotechnical investigation, site preparation, ground improvement, foundation on soft and filled-up soil, pile foundation, seepage control, erosion control and retaining wall, marine projects, simplified liquefaction potential assessment, tailing storage management at mines, failure during construction, site hazard and remedy and geotechnical and foundation engineering practice. This book will be highly useful for professionals and practicing engineers in the area of geotechnical and foundations engineering. It will also be a useful reference for graduate and postgraduate students and the faculty in the same field.
Download or read book Consolidation of Soils written by Frank C. Townsend and published by ASTM International. This book was released on 1986 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ground Improvement Techniques PB written by Dr. P. Purushothama Raj and published by Firewall Media. This book was released on 2005-12 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
