Download or read book Influence of Silt Size and Content on Static Liquefaction Potential of Sand written by M. Murat Monkul and published by . This book was released on 2011 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Different specimen preparation methods such as moist tamping, dry funnel deposition, slurry deposition, dry air pluviation have been reported in the literature to investigate the undrained behavior of silty sands. Similarly, different means have been used to densify the soils prepared with such methods. However, the influence of the densification technique, utilized within a particular deposition method, on undrained behavior (e.g. change in initial peak deviator stress and instability angle) was not known. Therefore, a new densification technique is developed for the dry funnel deposition method, which avoids tamping, vibrating or mold tapping. This new method of densification is thought to create a much consistent soil fabric for different amounts of densification than other specimen densification techniques. The experimental results show that the change in undrained behavior with increasing density produced by densification is much less pronounced when compared to the other densification methods reported in the literature. Prior research efforts regarding the effect of non plastic silts on the liquefaction behavior of sands mainly focused on the influence of fines content, confining stress, and depositional techniques. However, there is no consensus in the literature regarding the influence of fines content on the undrained behavior of silty sands. Strain-controlled monotonic undrained triaxial compression tests were performed on a single base sand mixed with three different essentially nonplastic silts. First, silt size effects are investigated while other factors like fines content (20%), confining stress (30kPa) and deposition method (dry funnel deposition) were kept the same. The results show that silt size is indeed an important factor which influences the liquefaction potential of silty sands. Different comparison bases for undrained behavior such as the loosest possible density after deposition, intergranular void ratio, void ratio and relative density were also evaluated. It was observed that as the mean grain diameter ratio (D50/d50) of the sand grains (D50) to silt grains (d50) decreases, liquefaction potential for a silty sand increases. This tendency is attributed to more metastable contacts with increasing silt size. Finally, the influence of fines content on the static liquefaction potential of silty sand is investigated for different silt types. It was found that if the mean grain diameter ratio (D[subscript 50-sand]/d[subscript 50-silt]) is sufficiently small, the liquefaction potential of the sand increases steadily with increasing fines content for the studied range (0-20%). As mean grain diameter ratio (D[subscript 50-sand]/d[subscript 50-silt]) increases, the liquefaction potential of the sand first decreases then increases with fines content. For such cases, liquefaction potential of the silty sand might be less than the liquefaction potential of the clean sand. Differences in undrained behavior are explained based on the influence of mean grain diameter ratio (D[subscript 50-sand]/d[subscript 50-silt]) on the initial soil fabric.
Download or read book Cyclic behaviour and liquefaction potential of silty sand Experimental and numerical investigations written by Abdulaziz Osman Abdelkadr and published by BoD – Books on Demand. This book was released on 2023-01-01 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study experimental and numerical investigations have been carried out with the emphasis on studying the behaviour and liquefaction state of typical silty sand sampled from the Mekelle area in Ethiopia under monotonic and cyclic undrained loadings. Experiments have been carried out to measure the pore pressure accumulation, deformation characteristics and related effective stress paths. A numerical model was then used to simulate the behaviour and liquefaction state associated with the changes in the stress-strain-pore pressure levels by means of the finite element method (FEM) using the FE code Tochnog (Tochnog Professional Company 2021).
Download or read book Percentage Silt Content in Sands and Its Effect on Liquefaction Potential written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ground Motions and Soil Liquefaction During Earthquakes written by Harry Bolton Seed and published by . This book was released on 1982 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Fine Particles on the Liquefaction Properties of a Reference Sand written by Zhehao Zhu and published by Springer Nature. This book was released on 2023-02-11 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past thirty years, the liquefaction of sand containing a small amount of fine particles has become an engaging topic in the geotechnical community. Indeed, a great variety of field investigations revealed that the real liquefied soils are mainly composed of a host sand matrix and a small fraction of plastic or non-plastic fines. In this context, several series of monotonic and cyclic triaxial tests were performed to clarify the influence of these fine particles on the development of sand liquefaction. To get closer to in situ conditions, 1g shaking table tests were carried out with two different-sized model soil containers. The first one, small size, was essentially used to check the reconstitution and the saturation method. The second one, very large size, was manufactured to explore the sand liquefaction behaviour during base shaking in an almost actual engineering size. To numerically reproduce the sand liquefaction behaviour, the Dafalias model has been taken as an example and its input parameters were calibrated by an artificial intelligence method. An in-depth analysis of the proposed method was done with the elastoplastic theory.
Download or read book Percentage Silt Content in Sands and Its Effect on Liquefaction Potential written by Lester Paul Kaufman and published by . This book was released on 1981 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geotechnical Earthquake Engineering written by Steven Lawrence Kramer and published by CRC Press. This book was released on 2024-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This fully-updated new edition provides an introduction to geotechnical earthquake engineering to first-time readers (typically first-year graduate students) with a level of detail that will be useful to more advanced students, as well as researchers and practitioners. It covers the topic of geotechnical earthquake engineering beginning with an introduction to seismology and earthquake ground motions. It also includes hazard analysis and performance-based earthquake engineering design and dynamic soil properties. These topics are followed by site response and its analysis and soil-structure interaction"--
Download or read book Soil Liquefaction written by Michael Jefferies and published by CRC Press. This book was released on 2006-09-04 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil liquefaction is a major concern in areas of the world subject to seismic activity or other repeated vibration loads. This book brings together a large body of information on the topic, and presents it within a unified and simple framework. The result is a book which will provide the practising civil engineer with a very sound understanding of
Download or read book ICPMG2014 Physical Modelling in Geotechnics written by Christophe Gaudin and published by CRC Press. This book was released on 2019-01-08 with total page 1366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 8th International Conference on Physical Modelling in Geotechnics (ICPMG2014) was organised by the Centre for Offshore Foundation Systems at the University of Western Australia under the auspices of the Technical Committee 104 for Physical Modelling in Geotechnics of the International Society of Soil Mechanics and Geotechnical Engineering. This quadrennial conference is the traditional focal point for the physical modelling community of academics, scientists and engineers to present and exchange the latest developments on a wide range of physical modelling aspects associated with geotechnical engineering. These proceedings, together with the seven previous proceedings dating from 1988, present an inestimable collection of the technical and scientific developments and breakthroughs established over the last 25 years. These proceedings include 10 keynote lectures from scientific leaders within the physical modelling community and 160 peer-reviewed papers from 26 countries. They are organised in 14 themes, presenting the latest developments in physical modelling technology, modelling techniques and sensors, through a wide range of soil-structure interaction problems, including shallow and deep foundations, offshore geotechnics, dams and embankments, excavations and retaining structures and slope stability. Fundamental aspects of earthquake engineering, geohazards, ground reinforcements and improvements, and soil properties and behaviour are also covered, demonstrating the increasing complexity of modelling arising from state-of-the-art technological developments and increased understanding of similitude principles. A special theme on education presents the latest developments in the use of physical modelling techniques for instructing undergraduate and postgraduate students in geotechnical engineering.
Download or read book Geotechnics for Transportation Infrastructure written by Ravi Sundaram and published by Springer. This book was released on 2019-06-12 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents selected papers from the International Symposium on Geotechnics for Transportation Infrastructure (ISGTI 2018). The research papers cover geotechnical interventions for the diverse fields of policy formulation, design, implementation, operation and management of the different modes of travel, namely road, air, rail and waterways. This book will be of interest to academic and industry researchers working in transportation geotechnics, as also to practicing engineers, policy makers, and civil agencies.
Download or read book The Effect of Carbonaceous Fines on the Liquefaction Potential of Sands written by Maha Kassim Saleh and published by . This book was released on 2005 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquake events over the past forty years have demonstrated that the potential damage to man-made structures associated with soil liquefaction can be very sig nificant. Whereas the phenomenon of liquefaction of relatively clean sands due to earthquake shaking is well understood, the case remains relatively unclear wh en fine grained materials are present within the sand matrix. No clear consensus exists regarding the effect of increased fines content on the overall response of sand deposits. A resolution of what appears in some reported studies as confl icting observations is of concern for land reclamation projects and sea fills, p articularly for cases where the material source is variable and contains signifi cant levels of fines. The nature of the fines themselves may have a measurable e ffect on the matrix behavior. The work presented herein explores the effect of s ilt and clay-size carbonaceous fines on the liquefaction susceptibility of sand. The choice of fines was guided by the conditions associated with the Lebanon co astal reclamation projects, where limestone/marlstone quarry source materials ar e dominant. The scope of the testing program included a large number of laboratory cyclic tr iaxial tests on reconstituted soil samples of varying composition. The sand chos en as the matrix material was a "standard sand" (Ottawa Sand-ASTM C109 graded sa nd). The effect of varying several parameters was evaluated, namely: relative de nsity, fines content, fines type/plasticity. The Ishihara 5% double amplitude st rain criterion was adopted as a basis to determine the onset of "liquefaction" a nd the cyclic resistance ratio (CRR). The results obtained confirm the significa nt effect of fines on the cyclic resistance of sands. They also confirm the exis tence of a limit fines content and a plasticity index (PI) threshold and establi sh their effect on observed behavior.
Download or read book Effects of Non Plastic Fines on Minimum and Maximum Void Ratios of Sand written by PV. Lade and published by . This book was released on 1998 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behavior of sand is affected by the content of nonplastic fine particles. How and to what degree the fines content affects the minimum and maximum void ratios has been studied in detail. A review is presented of previous theoretical and experimental studies of minimum and maximum void ratios of single spherical grains, packings of spheres of several discrete sizes, as well as optimum grain-size ratios to produce maximum densities. A systematic experimental study is performed of the variation of minimum and maximum void ratios with contents of fines for sands with smoothly varying particle size curves and a large variety of size distributions. It is shown that the fines content plays an important role in determining the sand structure and the consequent minimum and maximum void ratios. It is indicated how the fines content and sand structure affects the compressibility and the static liquefaction potential of the sand.
Download or read book Canadian Geotechnical Journal written by and published by . This book was released on 2012 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frank L Di Maggio Symposium on Constitutive Modeling of Geomaterials June 3 5 2002 written by Hoe I. Ling and published by CRC Press. This book was released on 2003-01-23 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists involved with geomaterial modeling honor the retirement of distinguished colleague Frank L. DiMaggio (civil engineering and engineering mechanics, Columbia U.) by offering contributions representing recent advances in the modeling of sand, clay, and concrete. DiMaggio contributed to the d
Download or read book Effect of Fines Content on Liquefaction Potential of Sands written by Duygu Erten and published by . This book was released on 1994 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book State of the Art and Practice in the Assessment of Earthquake Induced Soil Liquefaction and Its Consequences written by National Academies of Sciences, Engineering, and Medicine and published by . This book was released on 2019-01-30 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquake-induced soil liquefaction (liquefaction) is a leading cause of earthquake damage worldwide. Liquefaction is often described in the literature as the phenomena of seismic generation of excess porewater pressures and consequent softening of granular soils. Many regions in the United States have been witness to liquefaction and its consequences, not just those in the west that people associate with earthquake hazards. Past damage and destruction caused by liquefaction underline the importance of accurate assessments of where liquefaction is likely and of what the consequences of liquefaction may be. Such assessments are needed to protect life and safety and to mitigate economic, environmental, and societal impacts of liquefaction in a cost-effective manner. Assessment methods exist, but methods to assess the potential for liquefaction triggering are more mature than are those to predict liquefaction consequences, and the earthquake engineering community wrestles with the differences among the various assessment methods for both liquefaction triggering and consequences. State of the Art and Practice in the Assessment of Earthquake-Induced Soil Liquefaction and Its Consequences evaluates these various methods, focusing on those developed within the past 20 years, and recommends strategies to minimize uncertainties in the short term and to develop improved methods to assess liquefaction and its consequences in the long term. This report represents a first attempt within the geotechnical earthquake engineering community to consider, in such a manner, the various methods to assess liquefaction consequences.
Download or read book Influence of Sample Disturbance on Sand Response to Cyclic Loading written by Kenji Mori and published by . This book was released on 1977 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
