Download or read book Effect of Saturation on Dynamic Response of Footings in Sand written by Jack K. Poplin and published by . This book was released on 1970 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation was undertaken to determine the effect of saturation of dense sand on the response of square footings to nuclear blast-type loading. Tests were conducted with footings on the surface and at a depth of burial equal to the footing width with a water table coincident with the plane of the footing. The results of these tests were compared with data from similar tests on dry sand from a preceding study. Saturation of dense sand had the effect of reducing maximum displacement. The displacements of surface footings were only about 30 percent of the displacement of footings on dry sand with equivalent soil density and loading condition, and the displacement of shallow buried footings was reduced by 50 percent. Empirical load-displacement curves developed from previous studies on dry sand were shown to be conservative when used to predict the response of footings on saturated dense sand. The primary difference in response occurred after peak reaction. The footings on saturated dense sand came to rest immediately, while footings on dry sand continued to displace for some short distance. This behavior was attributed to the development of transient negative pore pressures resulting from dilation of the sand. A similar laboratory investigation on a medium-density sand is recommended in order to determine whether or not any tendency toward liquefaction may occur at the lower end of the range of densities of interest for protective structure foundations. (Author).

Download or read book Dynamic response of footings bearing on saturated sand written by Lawrence G. Cartwright and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Relative Density and Pulse Duration on Dynamic Response of Footings Buried in Sand written by Jack K. Poplin and published by . This book was released on 1969 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Computer Program for Dynamic Response of Layered Saturated Sands written by Mahantesh S. Hiremath and published by . This book was released on 1984 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Engineering Approach to dynamic response analysis of saturated sand deposits is investigated. The logic on which the methodology is based is described and implemented in a computer program. Application of the procedure to obtain dynamic response of a saturated sand layer, including pore pressure, shear stress, and acceleration variations under two different ground excitation histories given. Two alternative numerical procedures are investigated. The results are compared with those reported by Finn. Limitations of the approach are discussed. Originator-supplied keywords: Computer Simulation, Dynamic Response, Explosion Effects, Finite Difference Method, Layered Sands, Seepage, Liquefaction, and Seismic Response.

Download or read book A Model Study of Dynamically Loaded Square Footings on Dry Sand written by Jack K. Poplin and published by . This book was released on 1969 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation reported herein was undertaken to develop an approach to modeling displacements of surface and shallow-buried footings on dry sand subject to high-intensity, single-pulse loads. A hypothetical shallow-bured structure with an isolated footing loaded by airblast overpressure produced by detonation of a nuclear weapon was assumed for design of load pulses on nine model footings used: footing widths of 4.5, 6.0, and 7.5 in. and depth-of-burial to footing width ratios of 0, 0.5, and 1.0. The principles of similitude were used to scale length, force, and time in the models. The models were placed in mobile test bins of uniform, fine, dry sand (90 percent relative density) and subjected to dynamic and static loading. Nondimensional load-displacement relations dependent only on depth-of-burial ratio were developed relating maximum displacement to peak dynamic load, footing width, and soil shear strength gradient. When the dynamic response of the footings in the form of reaction-displacement curves was compared with static response, an increase in initial stiffness and ultimate strength was observed for dynamic loading. However, these dynamic increases were greatest when the static shear strength was lowest, i.e. footings on the surface, and were least for footings buried at a depth equal to its width where the static overburden produced a substantial increase in shear strength. (Author).

Download or read book List of Publications of the U S Army Engineer Waterways Experiment Station written by Waterways Experiment Station (U.S.) and published by . This book was released on 1973 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Previbration Signature on Dynamic Properties of Dry Sand written by Z. X. Yang and published by . This book was released on 2019 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The shear modulus and damping ratio of soils at low to medium strains are essential input parameters in dynamic response analysis of soils. As soil elements in the field always have a history of being subjected to vibrations due to earthquakes, construction works, and vehicle motions, etc., the previbration effect on the dynamic properties of soils needs to be addressed appropriately. This study presents a series of tests performed by a newly developed resonant column system that enables the assessment of the dynamic properties of soils that have only undergone dozens of vibration cycles to investigate the impact of the vibration history on the dynamic properties of dry sand. Both the shear modulus and damping ratio of sand under different confining pressures (p′) are measured after the application of a previbration with a wide range of vibration amplitudes (?pre) and number of cycles (N). The results show that an elastic threshold strain exists for the dynamic properties of sand, beyond which the effect of the vibration history can be identified from the shear modulus reduction and damping ratio curves. The results also confirm that the effect of the vibration history on dry sand depends on the test variables of?pre,N, andp′. In addition, a new interpretation method is proposed to quantify the combined effects of?preandNon the signature of the vibration history, which could potentially be useful for interpreting the dynamic properties of the in situ soils that may experience previbration.

Download or read book List of Publications of the U S Army Engineer Waterways Experiment Station written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1976 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book List of Publications of the U S Army Engineers Waterway Experiment Station written by United States. Army. Corps of Engineers and published by . This book was released on 1976 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Applications of Geotechnical Engineering and Construction written by Mahdi O. Karkush and published by Springer Nature. This book was released on 2020-12-21 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: p="" This book contains select papers from the International Conference on Geotechnical Engineering Iraq discussing the challenges, opportunities, and problems of application of geotechnical engineering in projects. The contents cover a wide spectrum of themes in geotechnical engineering, including but not limited to sustainability & geotechnical engineering, modeling of foundations & slope stability, seismic analysis & soil mechanics, construction materials, and construction & management of projects. This volume will prove a valuable resource for practicing engineers and researchers in the field of geotechnical engineering, structural engineering, and construction and management of projects. ^

Download or read book Soil Dynamics and Earthquake Geotechnical Engineering written by Boominathan Adimoolam and published by Springer. This book was released on 2018-06-09 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected proceedings of the annual conference of the Indian Geotechnical Society, and covers various aspects of soil dynamics and earthquake geotechnical engineering. The book includes a wide range of studies on seismic response of dams, foundation-soil systems, natural and man-made slopes, reinforced-earth walls, base isolation systems and so on, especially focusing on the soil dynamics and case studies from the Indian subcontinent. The book also includes chapters addressing related issues such as landslide risk assessments, liquefaction mitigation, dynamic analysis of mechanized tunneling, and advanced seismic soil-structure-interaction analysis. Given its breadth of coverage, the book offers a useful guide for researchers and practicing civil engineers alike.

Download or read book Analytical Methods in Petroleum Upstream Applications written by Cesar Ovalles and published by CRC Press. This book was released on 2015-04-02 with total page 1351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effective measurement of the composition and properties of petroleum is essential for its exploration, production, and refining; however, new technologies and methodologies are not adequately documented in much of the current literature. Analytical Methods in Petroleum Upstream Applications explores advances in the analytical methods and instrumentation that allow more accurate determination of the components, classes of compounds, properties, and features of petroleum and its fractions. Recognized experts explore a host of topics, including: A petroleum molecular composition continuity model as a context for other analytical measurements A modern modular sampling system for use in the lab or the process area to collect and control samples for subsequent analysis The importance of oil-in-water measurements and monitoring The chemical and physical properties of heavy oils, their fractions, and products from their upgrading Analytical measurements using gas chromatography and nuclear magnetic resonance (NMR) applications Asphaltene and heavy ends analysis Chemometrics and modeling approaches for understanding petroleum composition and properties to improve upstream, midstream, and downstream operations Due to the renaissance of gas and oil production in North America, interest has grown in analytical methods for a wide range of applications. The understanding provided in this text is designed to help chemists, geologists, and chemical and petroleum engineers make more accurate estimates of the crude value to specific refinery configurations, providing insight into optimum development and extraction schemes.

Download or read book Marine Geo Hazards in China written by Yin-can YE and published by Elsevier. This book was released on 2017-06-22 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine Geo-Hazards in China, the first book to focus specifically on potential marine geological hazards in China, includes 19 chapters with varying focus on key issues surrounding the topic.Early chapters discuss the historical background, research progress, and geological environments in China's sea area. Next, multiple chapters present special topics on geological hazards in China's sea area, including its disaster pregnant environment, mechanisms of disaster change, the development regularity and disaster formation process, and existing or potential dangers and countermeasures. Final chapters present the latest information on the distribution, development, assessment, and risk analysis of marine geological hazards.This book is an important source of information for government and local policymakers, environmental and marine scientists, and engineers. Discusses the background, current research, and systematically reviews the history, major advances in the studies in the field, and demonstrates the development prospect of this subject Contains and summarizes the author’s longstanding achievements in the field, as well as includes a wide range of researches conducted both locally and overseas Systematically summarizes the basic characteristics of the distribution and development of the main types of geological hazards in China seas Puts forward the scheme of marine geological disaster regionalization of China, and is significant for researches in other countries or regions

Download or read book Transactions of the American Society of Civil Engineers written by American Society of Civil Engineers and published by . This book was released on 2005 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.

Download or read book U S Government Research Development Reports written by and published by . This book was released on 1970 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rock Dynamics Progress and Prospect Volume 1 written by Jianchun Li and published by CRC Press. This book was released on 2022-12-06 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock Dynamics: Progress and Prospect contains 153 scientific and technical papers presented at the Fourth International Conference on Rock Dynamics and Applications (RocDyn-4, Xuzhou, China, 17-19 August 2022). The two-volume set has 7 sections. Volume 1 includes the first four sections with 6 keynotes and 5 young scholar plenary session papers, and contributions on analysis and theoretical development, and experimental testing and techniques. Volume 2 contains the remaining three sections with 74 papers on numerical modelling and methods, seismic and earthquake engineering, and rock excavation and engineering. Rock Dynamics: Progress and Prospect will serve as a reference on developments in rock dynamics scientific research and on rock dynamics engineering applications. The previous volumes in this series (RocDyn-1, RocDyn-2, and RocDyn-3) are also available via CRC Press.

Download or read book U S Government Research and Development Reports Index written by and published by . This book was released on 1970 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: