Download or read book Single Response to Liquefaction induced Lateral Spreading written by and published by . This book was released on 2005 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of liquefaction-induced lateral spreading and its effects on pile foundations has been presented. A review of currently available methods of analysis for prediction of bending moments and deflections of a single pile subjected to lateral spreading has also been conducted. The methods included in this study are: (a) Deformation method, (b) Japanese Road Association (JRA) method, (c) Limit Equilibrium method, (d) Hybrid force-deformation imposed method, and (e) Finite element method. Numerical analyses were conducted on single piles subjected to lateral spreading, using ABAQUS, based on the first four methods indicated above. The numerical analyses involved three different soil-pile configurations: (a) a two-layer soil profile without a non-liquefiable soil crust, (b) a three-layer soil profile with a non-liquefiable soil crust underlain by liquefiable soil over a dense sand, and (c) a three-layer soil profile like that of case (b) with a lateral deformation constraint at the pile head. The results were compared with a limited number of centrifuge data on single piles. The purpose was to calibrate these methods and assess their ability to capture the measured moment and deflection responses of single piles. The limit equilibrium method and the deformation-imposed method predicted the centrifuge data very well. The JRA method overpredicted both moments and pile deflections by as much as four times. Based on deformation imposed method, parametric analyses were also conducted to study the influence of: (i) the crust thickness, (ii) the liquefied layer thickness, (iii) the non-liquefied bottom layer thickness, (iv) the pile diameter, and (v) the lateral pile head deflection constraint, on pile response subjected to lateral displacements induced by soil liquefaction. The effects of these parameters on single pile response are presented.

Download or read book Liquefaction induced Lateral Spreading and Its Effects on Pile Foundations written by Liangcai He and published by . This book was released on 2005 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pile Response to Liquefaction induced Lateral Spread written by Wolfgang Daniel Meyersohn and published by . This book was released on 1994 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground written by Ross W. Boulanger and published by . This book was released on 2006 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a workshop on Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground, held in Davis, California, March 16-18, 2005. Sponsored by the Pacific Earthquake Engineering Research Center; University of California at Berkeley; Center for Urban Earthquake Engineering; Tokyo Institute of Technology; Geo-Institute of ASCE. This collection contains 25 papers that discuss physical measurements and observations from earthquake case histories, field tests in blast-liquefied ground, dynamic centrifuge model studies, and large-scale shaking table studies. Papers contain recent findings on fundamental soil-pile interaction mechanisms, numerical analysis methods, and reviews and evaluations of existing and emerging design methodologies. This proceeding provides comprehensive coverage of a major issue in earthquake engineering practice and hazard mitigation efforts.

Download or read book Liquefaction Induced Lateral Spreading in Large scale Shake Testing written by Raghudeep Bethapudi and published by . This book was released on 2008 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquefaction and lateral spreading of gently sloping ground remains a puzzling problem. Data collected from sites damaged due to previous earthquakes, scaled experiments and computational modeling have given a general picture of how the soil behaves during liquefaction and lateral spreading but many questions are yet to be answered. A large scale 1-g laminar box system capable of simulating response of flat ground as well as gently sloping ground conditions of up to 6m depth subjected to shaking has been developed by the researchers at University at Buffalo. The system involves a laminar box made of 24 laminates stacked together, a shaking base, computer controlled high speed actuators, strong floor, strong wall, dense array advanced instrumentation, and a novel laboratory hydraulic fill method to construct the sand simulating underwater deposition with density control. It is suitable to study liquefaction response and its effects on foundations in saturated loose sands at a relative density of 35~50% or less. Two large scale liquefaction experiments, involving nearly 5m deep sand deposit, one simulating level ground and the other simulating gently sloping ground, are presented. The tests were conducted using 6.2m high laminar box with base dimensions of 2.75m wide and 5m long. The soil deposit was prepared using hydraulic fill method at 35~50% range. A dense array of accelerometers, pore pressure sensors, potentiometers (for displacement measurements), high speed video cameras, and a novel MEMS type sensor array were used to monitor the soil response. Liquefaction occurred in level ground test with little lateral deformation. Liquefaction and large lateral displacements occurred in the sloping ground inclined at 2 degrees. The experimental results presented herein demonstrate the effectiveness of full-scale testing to investigate the mechanism of lateral spreading and confirm the advantage of using the University at Buffalo's geotechnical laminar box to simulate and understand the physics of even large and complex problems such as soil-structure interaction.

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 Soil pile Interaction During Liquefaction induced Lateral Spread written by Siang Huat Goh and published by . This book was released on 2001 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of Pile Foundations in Liquefiable Soils written by Gopal Madabhushi and published by Imperial College Press. This book was released on 2010 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pile foundations are the most common form of deep foundations that are used both onshore and offshore to transfer large superstructural loads into competent soil strata. This book provides many case histories of failure of pile foundations due to earthquake loading and soil liquefaction. Based on the observed case histories, the possible mechanisms of failure of the pile foundations are postulated. The book also deals with the additional loading attracted by piles in liquefiable soils due to lateral spreading of sloping ground. Recent research at Cambridge forms the backbone of this book with the design methodologies being developed directly based on quantified centrifuge test results and numerical analysis. The book provides designers and practicing civil engineers with a sound knowledge of pile behaviour in liquefiable soils and easy-to-use methods to design pile foundations in seismic regions. For graduate students and researchers, it brings together the latest research findings on pile foundations in a way that is relevant to geotechnical practice. Sample Chapter(s). Foreword (85 KB). Chapter 1: Performance of Pile Foundations (4,832 KB). Contents: Performance of Pile Foundations; Inertial and Kinematic Loading; Accounting for Axial Loading in Level Ground; Lateral Spreading of Sloping Ground; Axial Loading on Piles in Laterally Spreading Ground; Design Examples. Readership: Researchers, academics, designers and graduate students in earthquake engineering, civil engineering and ocean/coastal engineering.

Download or read book Single Piles in Liquefiable Ground written by Rui Wang and published by Springer. This book was released on 2016-03-17 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the seismic response of piles in liquefiable ground. It describes the design of a three-dimensional, unified plasticity model for large post-liquefaction shear deformation of sand, formulated and implemented for parallel computing. It also presents a three-dimensional, dynamic finite element analysis method for piles in liquefiable ground, developed on the basis of this model,. Employing a combination of case analysis, centrifuge shaking table experiments and numerical simulations using the proposed methods, it demonstrates the seismic response patterns of single piles in liquefiable ground. These include basic force-resistance mode, kinematic and inertial interaction coupling mechanism and major influence factors. It also discusses a beam on the nonlinear Winkler foundation (BNWF) solution and a modified neutral plane solution developed and validated using centrifuge experiments for piles in consolidating and reconsolidating ground. Lastly, it studies axial pile force and settlement during post-earthquake reconsolidation, showing pile axial force to be irrelevant in the reconsolidation process, while settlement is process dependent.

Download or read book MARS Applications in Geotechnical Engineering Systems written by Wengang Zhang and published by Springer. This book was released on 2019-04-30 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the application of a comparatively simple nonparametric regression algorithm, known as the multivariate adaptive regression splines (MARS) surrogate model, which can be used to approximate the relationship between the inputs and outputs, and express that relationship mathematically. The book first describes the MARS algorithm, then highlights a number of geotechnical applications with multivariate big data sets to explore the approach’s generalization capabilities and accuracy. As such, it offers a valuable resource for all geotechnical researchers, engineers, and general readers interested in big data analysis.

Download or read book Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions written by Francesco Silvestri and published by CRC Press. This book was released on 2019-07-19 with total page 8083 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions contains invited, keynote and theme lectures and regular papers presented at the 7th International Conference on Earthquake Geotechnical Engineering (Rome, Italy, 17-20 June 2019. The contributions deal with recent developments and advancements as well as case histories, field monitoring, experimental characterization, physical and analytical modelling, and applications related to the variety of environmental phenomena induced by earthquakes in soils and their effects on engineered systems interacting with them. The book is divided in the sections below: Invited papers Keynote papers Theme lectures Special Session on Large Scale Testing Special Session on Liquefact Projects Special Session on Lessons learned from recent earthquakes Special Session on the Central Italy earthquake Regular papers Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions provides a significant up-to-date collection of recent experiences and developments, and aims at engineers, geologists and seismologists, consultants, public and private contractors, local national and international authorities, and to all those involved in research and practice related to Earthquake Geotechnical Engineering.

Download or read book Liquefaction Induced Building Performance and Near Fault Ground Motions written by Connor Patrick Hayden and published by . This book was released on 2014 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent earthquakes in Chile, New Zealand, and Japan have re-emphasized the damaging consequences of liquefaction on infrastructure. Due to the complexity of the problem and limited well-documented field case histories, liquefaction-induced building settlements are often estimated using empirical correlations developed for free-field sites on level ground that account for post-liquefaction volumetric strains only. Additional effects due to the presence of a structure are not accounted for with these procedures. The earthquake performance of structures founded on liquefiable ground depends on a complex interaction between the soil properties, the ground motion characteristics, and the structural properties. This thesis presents three related research projects that address aspects of the effects of soil liquefaction including near-fault sites. This research thesis is focused on characterizing and selection of near-fault ground motions, geotechnical centrifuge testing of model buildings affected by liquefaction, and the development of field case histories in Chile following the 2010 Maule, Chile earthquake. Earthquake ground motions are important in liquefaction-induced building performance. Ground motions in the near-fault region frequently have intense, double-sided pulses in the velocity-time series that can be very damaging to structures; forward directivity is a leading cause of these pulses. However, pulses do not always occur in the forward directivity region, and some pulses are not caused by forward directivity. The present study used a new, automated algorithm to classify a large database of records as pulse or nonpulse motions. A straightforward model was developed to estimate the proportion of pulse motions as a function of closest site-to-source distance and epsilon of the seismic hazard. Geotechnical centrifuge tests provide valuable insight into the performance of structures affected by liquefaction. An area particularly lacking understanding is the interaction of closely spaced structures subjected to liquefaction. Two well-instrumented centrifuge tests were performed to investigate the response of three types of model structures founded on liquefiable ground in isolated and adjacent configurations. Acceleration, pore water pressure, and settlement measurements indicated that liquefaction-induced settlement of structures depends on a complex interaction of ground motion, soil, and structural characteristics. For the particular scenarios examined in this study, adjacent structures experienced moderately lower foundation accelerations, tended to tilt away from each other, and settled less than isolated structures. The 2010, MW = 8.8, Maule, Chile earthquake caused substantial damage, including liquefaction-induced damage to infrastructure and provides an important opportunity to learn from these field case histories. This project focuses on improved characterization of the subsurface conditions using penetration testing (i.e., SPT and CPT) at a hospital and two bridges that suffered liquefaction-induced damage. The recently constructed hospital has 10 structurally isolated wings varying in height from one to six stories, which provides a unique opportunity to examine the differing response of varying wings. Liquefaction of plastic, silty soils at the hospital resulted in differential settlement, whereas liquefaction of clean, medium-dense sandy soils resulted in lateral spreading and damage to bridge piers.

Download or read book Liquefaction induced Lateral Spread Displacement written by T. Leslie Youd and published by . This book was released on 1993 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Parallel Finite Element Modeling of Earthquake Liquefaction Response written by Liangcai He and published by . This book was released on 2006 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Liquefaction during Recent Large Scale Earthquakes written by Rolando P. Orense and published by CRC Press. This book was released on 2014-04-15 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil Liquefaction during Recent Large-Scale Earthquakes contains selected papers presented at the New Zealand – Japan Workshop on Soil Liquefaction during Recent Large-Scale Earthquakes (Auckland, New Zealand, 2-3 December 2013). The 2010-2011 Canterbury earthquakes in New Zealand and the 2011 off the Pacific Coast of Tohoku Earthquake in Japan have caused significant damage to many residential houses due to varying degrees of soil liquefaction over a very wide extent of urban areas unseen in past destructive earthquakes. While soil liquefaction occurred in naturally-sedimented soil formations in Christchurch, most of the areas which liquefied in Tokyo Bay area were reclaimed soil and artificial fill deposits, thus providing researchers with a wide range of soil deposits to characterize soil and site response to large-scale earthquake shaking. Although these earthquakes in New Zealand and Japan caused extensive damage to life and property, they also serve as an opportunity to understand better the response of soil and building foundations to such large-scale earthquake shaking. With the wealth of information obtained in the aftermath of both earthquakes, information-sharing and knowledge-exchange are vital in arriving at liquefaction-proof urban areas in both countries. Data regarding the observed damage to residential houses as well as the lessons learnt are essential for the rebuilding efforts in the coming years and in mitigating buildings located in regions with high liquefaction potential. As part of the MBIE-JSPS collaborative research programme, the Geomechanics Group of the University of Auckland and the Geotechnical Engineering Laboratory of the University of Tokyo co-hosted the workshop to bring together researchers to review the findings and observations from recent large-scale earthquakes related to soil liquefaction and discuss possible measures to mitigate future damage. Soil Liquefaction during Recent Large-Scale Earthquakes will be of great interest to researchers, academics, industry practitioners and other professionals involved in Earthquake Geotechnical Engineering, Foundation Engineering, Earthquake Engineering and Structural Dynamics.

Download or read book Geotechnical Hazards from Large Earthquakes and Heavy Rainfalls written by Hemanta Hazarika and published by Springer. This book was released on 2016-09-01 with total page 629 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of papers presented at the International Workshop on Geotechnical Natural Hazards held July 12–15, 2014, in Kitakyushu, Japan. The workshop was the sixth in the series of Japan–Taiwan Joint Workshops on Geotechnical Hazards from Large Earthquakes and Heavy Rainfalls, held under the auspices of the Asian Technical Committee No. 3 on Geotechnology for Natural Hazards of the International Society for Soil Mechanics and Geotechnical Engineering. It was co-organized by the Japanese Geotechnical Society and the Taiwanese Geotechnical Society. The contents of this book focus on geotechnical and natural hazard-related issues in Asia such as earthquakes, tsunami, rainfall-induced debris flows, slope failures, and landslides. The book contains the latest information and mitigation technology on earthquake- and rainfall-induced geotechnical natural hazards. By dissemination of the latest state-of-the-art research in the area, the information contained in this book will help researchers, designers, consultants, government officials, and academicians involved in the mitigation of natural hazards. The findings and other information provided here is expected to contribute toward the development of a new chapter in disaster prevention and mitigation of geotechnical structures.

Download or read book Geotechnical Earthquake Engineering Second Edition written by Robert W. Day and published by McGraw Hill Professional. This book was released on 2012-08-06 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This one-stop resource--filled with in-depth earthquake engineering analysis, testing procedures, seismic and construction codes--features new coverage of the 2012 International Building Code"--