Author: M. S. NatarajaPublisher:
ISBN:
Category : Offshore structures
Languages : en
Pages : 22
Book Description
Ocean Wave-induced Liquefaction Analysis -- a Review of Available Procedures
Author: M. S. NatarajaPublisher:
ISBN:
Category : Offshore structures
Languages : en
Pages : 22
Book Description
Analysis for Wave-induced Liquefaction in Relation to Ocean Floor Stability
Author: Harry Bolton SeedPublisher:
ISBN:
Category : Ocean bottom
Languages : en
Pages : 34
Book Description
Analyses for Wave-induced Liquefaction in Relation to Off-shore Construction
Author: M. Shamimur RahmanProceedings of the Conference on Pipelines in Adverse Environments II
Author: Mark B. PickellPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 756
Book Description
ASCE Combined Index
Author: American Society of Civil EngineersPublisher:
ISBN:
Category : Civil engineering
Languages : en
Pages : 552
Book Description
Indexes materials appearing in the Society's Journals, Transactions, Manuals and reports, Special publications, and Civil engineering.
Evaluation of Ocean Wave-induced Liquefaction in a Large Scale Wave Flume
Author: David Leo ThielenPublisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 258
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.
Porous Models for Wave-seabed Interactions
Author: Dong-Sheng JengPublisher: Springer Science & Business Media
ISBN: 3642335926
Category : Science
Languages : en
Pages : 298
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.
Conference Papers Index
Author: Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 498
Book Description
Monthly. Papers presented at recent meeting held all over the world by scientific, technical, engineering and medical groups. Sources are meeting programs and abstract publications, as well as questionnaires. Arranged under 17 subject sections, 7 of direct interest to the life scientist. Full programs of meetings listed under sections. Entry gives citation number, paper title, name, mailing address, and any ordering number assigned. Quarterly and annual indexes to subjects, authors, and programs (not available in monthly issues).
Porous Models for Wave-seabed Interactions
Author: Dong-Sheng JengPublisher: Springer Science & Business Media
ISBN: 3642335934
Category : Science
Languages : en
Pages : 298
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.
State of the Art and Practice in the Assessment of Earthquake-Induced Soil Liquefaction and Its Consequences
Author: National Academies of Sciences, Engineering, and MedicinePublisher:
ISBN: 9780309440271
Category :
Languages : en
Pages : 350
Book Description
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.