Analysis for Wave-induced Liquefaction in Relation to Ocean Floor Stability PDF Download

Author: Harry Bolton Seed
Publisher:
ISBN:
Category : Ocean bottom
Languages : en
Pages : 34

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Author: M. Shamimur Rahman
Publisher:
ISBN:
Category :
Languages : en
Pages : 416

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Author: Dong-Sheng Jeng
Publisher: Cambridge University Press
ISBN: 1107160006
Category : Science
Languages : en
Pages : 371

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Book Description
An in-depth look at the mechanics of combined stresses imposed on the seabed from wave action and marine infrastructure.

Author: International Union of Theoretical and Applied Mechanics
Publisher: Springer Science & Business Media
ISBN: 9400949588
Category : Technology & Engineering
Languages : en
Pages : 570

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Book Description
Symposia do not just happen, and those which venture on the Bureau of IUT AM. I was on the train like a into new territory happen even less frequently. Never shot armed to the teeth with excuses. theless, faced by the challenge of organising such an I rehearsed my speech all the way down. I had event, many of us volunteer eagerly for the task. I am studiously opted for the environmental side of seabed not one of this select band. studies. I could prove it and produced papers on the Confronted by what at fIrst sight was but a casual correlation of geotechnical properties of the seabed invitation to consider whether I might be interested in with the populations of bugs that live there. Elsewhere commenting on the possibility I attended an informal (as in my defence package were items on landslips, clima I then thought) meeting at Newcastle University in 1980 tology, cluster analysis applied to business development to discuss the subject of Seabed Mechanics. Professor - anything I could find to illustrate my dissociation Len Maunder, Head of Mechanical Engineering here at from Seabed Mechanics proper.

Author: David Leo Thielen
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 258

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Book Description
Ocean waves propagating over cohesionless seabed deposits produce cyclic shear stresses within the deposit. Under certain conditions these stresses may cause a progressive build-up of pore pressure. Pore pressure accumulation can result in liquefaction or a substantial decrease in the effective stress with attendant large deformations of the seabed deposit. In recognition of the need to study ocean wave-induced liquefaction, a series of large scale wave flume tests were conducted. The test program consisted of generating a series of uniform waves over a sand deposit and measuring the pore pressure response. The pore pressure response was studied for a variety of soil and wave conditions. Specific variables addressed in the study included drainage conditions near the surface of the deposit, relative density of the deposit, magnitude of wave loading, and previous wave loading history. Both the cyclic and mean pore pressure responses in the deposit were determined. Cyclic shear stresses within the deposit are generated by wave-induced cyclic pressure fluctuations at the mudline. For a given wave length, the cyclic shear stresses increase with increasing wave height. Wave-induced liquefaction of a fine sand was observed. A decrease in effective stress and liquefaction resulted from an increase in the mean pore pressure during undrained wave loading. The mean pore pressure increased owing to a transfer of intergranular stress to the pore fluid. Pore pressures cycled about the shifting mean pressure at the same frequency as the wave loading. Mudline pressure fluctuations were not affected by pore pressure changes occurring below the mudline. Liquefaction resulted in gross disturbance of the deposit. Pore pressure accumulation was not observed during drained loading. Several drained tests were conducted for a range of initial relative density and wave conditions. During the drained tests, the relative density of the sand layer increased and settlement of the sand was observed. The increased density of the sand layer was accompanied by attenuation of the cyclic pore pressure fluctuations during the initial wave loading cycles of the test. Following attenuation, the cyclic pore pressure fluctuations remained constant to the end of the test. The effect of previous wave loading was evaluated by comparing the response of tests subjected to previous wave loading with those not subjected to previous wave loading. Previous wave loading resulted in increased stability of the sand with respect to liquefaction potential. The increased stability was the result of an increase in relative density as well as changes in the structure of the deposit. Measured mean pore pressure responses for all the tests were compared to the response predicted by a theoretical model. Theoretical predictions agreed with the measured response except for the case where the deposit was subjected to a previous wave loading history. The potential for pore pressure accumulation and liquefaction of a seabed deposit decreases with: 1) increased drainage at the surface of the deposit, 2) increased relative density, 3) decreased magnitude of wave loading, and 4) previous wave loading.

Author: Dongmei Zhang
Publisher: Springer
ISBN: 9811300178
Category : Science
Languages : en
Pages : 790

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Book Description
This book is the fifth volume of the proceedings of the 4th GeoShanghai International Conference that was held on May 27 - 30, 2018. This volume, entitled “Tunneling and Underground Construction”, covers the recent advances and technologies in tunneling and underground structure engineering. It presents the state-of-the-art planning philosophy, theories, experiments, methodologies and findings in the related areas. The importance of underground space utilization to the development of human society is also addressed. The challenges and future directions of underground engineering are highlighted. The topics include but are not limited to the tunneling and underground construction induced ground deformation, mechanical behaviors of segmental lining systems, tunneling in challenging situations, maintenance tactic and emergency counter-measures. The book may benefit researchers and scientists from the academic fields of tunneling and underground structure engineering as well as practical engineers from the industry. Each of the papers included in this book received at least two positive peer reviews. The editors would like to express their sincerest appreciation to all of the anonymous reviewers all over the world, for their diligent work.

Author: Dong-Sheng Jeng
Publisher: Springer Science & Business Media
ISBN: 3642335926
Category : Science
Languages : en
Pages : 298

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Book Description
"Porous Models for Wave-seabed Interactions" discusses the Phenomenon of wave-seabed interactions, which is a vital issue for coastal and geotechnical engineers involved in the design of foundations for marine structures such as pipelines, breakwaters, platforms, etc. The most important sections of this book will be the fully detailed theoretical models of wave-seabed interaction problem, which are particularly useful for postgraduate students and junior researchers entering the discipline of marine geotechnics and offshore engineering. This book also converts the research outcomes of theoretical studies to engineering applications that will provide front-line engineers with practical and effective tools in the assessment of seabed instability in engineering design. Prof. Dong-Sheng Jeng works at Shanghai Jiao Tong University, China.

Author: Bradley Gene DeRoos
Publisher:
ISBN:
Category : Marine sediments
Languages : en
Pages : 406

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Book Description

Author: Alan I. Prescott
Publisher: Nova Publishers
ISBN: 9781600217777
Category : Science
Languages : en
Pages : 354

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Book Description
Ocean engineering is the branch of engineering concerned with the design, analysis and operation planning of systems that operate in an oceanic environment. Examples of systems range from oil platforms to submarines, from breakwaters to sailboats. Common to all are the conditions of the ocean including waves, seawater, and hydrostatic pressure. The ocean environment presents a vast quantity of renewable sources of energy in the form of winds, waves, tides, currents and the density and thermal gradients between ocean water layers. This book presents leading-edge research in ocean engineering.

Author: John W. Bull
Publisher: CRC Press
ISBN: 0203471288
Category : Architecture
Languages : en
Pages : 397

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Book Description
In geomechanics, existing design methods are very much dependent upon sophisticated on-site techniques to assess ground conditions. This book describes numerical analysis, computer simulation and modelling that can be used to answer some highly complex questions associated with geomechanics. The contributors, who are all international experts in the field, also give insights into the future directions of these methods. Numerical Analysis and Modelling in Geomechanics will appeal to professional engineers involved in designing and building both onshore and offshore structures, where geomechanical considerations may well be outside the usual codes of practice, and therefore specialist advice is required. Postgraduate researchers, degree students carrying out project work in this area will also find the book an invaluable resource.