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Geotechnical Engineering

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Articles 2611 - 2640 of 4583

Full-Text Articles in Engineering

Risk Analysis In Geotechnical And Earthquake Engineering, State-Of-The-Art Practice Of Embankment Dams, D. N. D. Hartford Mar 2001

Risk Analysis In Geotechnical And Earthquake Engineering, State-Of-The-Art Practice Of Embankment Dams, D. N. D. Hartford

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Despite a proliferation of papers on quantitative risk analysis for dams during the past twenty years, risk analysis has not found widespread application in dam safety practice. Recent experience suggests that, despite a great deal of enthusiasm in the 1990’s, the professional opinion concerning the usefulness of risk analysis in dam safety practice is almost as divided now as it was in the early 1980’s. This paper presents an account of the history and development of risk analysis ln dam safety practice in the field of geotechnical earthquake engineering since its inception in the early 1960’s to September 2000. Against …


Investigation Of Seismic Soil-Footing Interaction By Large Scale Tests And Analytical Models, Ezio Faccioli, Roberto Paolucci, Guillermo Vivero Mar 2001

Investigation Of Seismic Soil-Footing Interaction By Large Scale Tests And Analytical Models, Ezio Faccioli, Roberto Paolucci, Guillermo Vivero

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Recent experimental and analytical research on seismic behavior of shallow foundations is illustrated. The most significant results on the seismic bearing capacity of footings with pseudo-static approaches are reviewed first, including an analytical formula recently proposed for the new version of the “seismic” Eurocode 8. Afterwards, we present the salient experimental results of large-scale cyclic tests of a shallow foundation model (1m x 1m in plan) resting on a large volume of sand, with relative densities 45% and 85%, discussing them in detail. Under earthquake-like cyclic loading, with peak values close to the pseudo-static failure limit, significant permanent settlement and …


Review Of Soil And Topography Effects In The September 7, 1999 Athens (Greece) Earthquake, George D. Bouckovalas, George Kouretzis Mar 2001

Review Of Soil And Topography Effects In The September 7, 1999 Athens (Greece) Earthquake, George D. Bouckovalas, George Kouretzis

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The earthquake that hit Athens, Greece on September 7, 1999 was an unexpected disaster. It originated from a previously unknown seismotectonic structure, at about 18 km to the west of the historical center, and left behind 143 casualties, about 100,000 homeless and 100 totally collapsed buildings. On the other hand, it provided a number of reliable strong motion recordings and well-defined patterns of damage at sites with known geological and geotechnical conditions. Evaluation of this information shows that the very stiff soils of the Athens basin amplified seismic ground motion by an average of 40% compared to nearby outcropping soft …


General Report — Session 5: Stability And Displacement Performance Of Slopes, Landfills, And Earth Dams Under Earthquakes, Donald G. Anderson, Allen M. Yourman, Hormoz Modaressi, Azm S. Al-Homoud, Robert C. Lo Mar 2001

General Report — Session 5: Stability And Displacement Performance Of Slopes, Landfills, And Earth Dams Under Earthquakes, Donald G. Anderson, Allen M. Yourman, Hormoz Modaressi, Azm S. Al-Homoud, Robert C. Lo

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


General Report — Session 11: Seismic Zonation And Microzonation, Earthquake Risk Assessment, And Earthquake Risk Management, M. S. Power, G. Estrada, S. Zlatovic, L. Matesic, F. R. Bickner, C. Cardona, F. H. Swan Mar 2001

General Report — Session 11: Seismic Zonation And Microzonation, Earthquake Risk Assessment, And Earthquake Risk Management, M. S. Power, G. Estrada, S. Zlatovic, L. Matesic, F. R. Bickner, C. Cardona, F. H. Swan

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Disclaimer, Shamsher Prakash Mar 2001

Disclaimer, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Steering Committee, Shamsher Prakash Mar 2001

Steering Committee, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Organizing Committee, Shamsher Prakash Mar 2001

Organizing Committee, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Recent Studies On Seismic Centrifuge Modeling Of Liquefaction And Its Effects On Deep Foundations, Ricardo Dobry, Tarek Abdoun Mar 2001

Recent Studies On Seismic Centrifuge Modeling Of Liquefaction And Its Effects On Deep Foundations, Ricardo Dobry, Tarek Abdoun

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The effects of liquefaction on deep foundations are very damaging and costly, and they keep recurring in many earthquakes. The first part of the paper reviews the field experience of deep foundations affected by liquefaction during earthquakes in the last few decades, as well as the main lessons learned. The second part of the paper presents results of physical modeling of deep foundations in the presence of liquefaction conducted mostly in the U.S. and Japan in the 1990’s, with emphasis on the work done by the authors and others at the 100 g-ton RPI centrifuge. Centrifuge models of instrumented single …


Dynamic Soil Properties, Seismic Downhole Arrays And Applications In Practice, Ahmed Elgamal, Tao Lai, Zhaohui Yang, Liangcai He Mar 2001

Dynamic Soil Properties, Seismic Downhole Arrays And Applications In Practice, Ahmed Elgamal, Tao Lai, Zhaohui Yang, Liangcai He

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Downhole arrays are deployed worldwide to record seismic ground response in near-surface strata. The information supplied by these arrays is increasingly becoming the basis for verification, and for development and calibration of predictive tools and design procedures. Advances __ in sensors and information technologies will further expedite this learning process, opening the door for worldwide sharing and collaboration. In this paper, the following topics are addressed: i) A summary of downhole array installations and data in the U.S. and in the Taiwan, Hualien and Lotung sites, ii) An overview of related current research efforts worldwide, iii) Downhole array system identification …


Photographic Ensemble - Soap Speakers And Special Presentations, Multiple Participants Mar 2001

Photographic Ensemble - Soap Speakers And Special Presentations, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Photographic Ensemble - Finn Symposium, Multiple Participants Mar 2001

Photographic Ensemble - Finn Symposium, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Photographic Ensemble - Speakers And Participants From Around The World, Multiple Participants Mar 2001

Photographic Ensemble - Speakers And Participants From Around The World, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Photographic Ensemble - Short Course, Multiple Participants Mar 2001

Photographic Ensemble - Short Course, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Preface, Shamsher Prakash Mar 2001

Preface, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Photographic Ensemble - Staff And Volunteers, Multiple Participants Mar 2001

Photographic Ensemble - Staff And Volunteers, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Closing Ceremonies, Shamsher Prakash Mar 2001

Closing Ceremonies, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Participants Of The Conference, Multiple Participants Mar 2001

Participants Of The Conference, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Organizing And Steering Committees Minutes, Shamsher Prakash Mar 2001

Organizing And Steering Committees Minutes, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Photographic Ensemble - Sessions In Progress, Multiple Participants Mar 2001

Photographic Ensemble - Sessions In Progress, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Participants Of Short Course, Multiple Participants Mar 2001

Participants Of Short Course, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


A Simplified Method Of Vibration Analysis Of Layered Foundation And Applications In Pavement Parameter Identification, Fuming Wang, Yigong Ji, Maotian Luan Mar 2001

A Simplified Method Of Vibration Analysis Of Layered Foundation And Applications In Pavement Parameter Identification, Fuming Wang, Yigong Ji, Maotian Luan

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In this paper, a simplified approach based on spline semi-analytical method is proposed for dynamic response analysis of visco-elastic layered half-space foundation. For varied geometrical and physical properties, the compliance function of layered non-homogeneous foundation is studied. Then an efficient and reliable numerical procedure for back-calculating material properties of pavement through the data measured from in-situ Falling Weight Deflectometer (FWD) tests is presented. The simulation results for in-situ data show that the proposed methodology is workable and applicable.


A Continuum Model For Soil-Pile-Structure Interactions Under Earthquake Excitation, K. K. Koo, K. T. Chau, X. Yang, Y. L. Wong, S. S. Lam Mar 2001

A Continuum Model For Soil-Pile-Structure Interactions Under Earthquake Excitation, K. K. Koo, K. T. Chau, X. Yang, Y. L. Wong, S. S. Lam

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

An exact analytical method for the interaction analysis of a fully coupled soil-pile-structure system under seismic excitation is investigated in this paper. Only horizontal shaking induced by harmonic SH waves was considered. The soil mass, pile and building were all considered as elastic with hysteretic type damping. Geometrically, the soil is modeled as an elastic isotropic homogeneous continuum, and both pile and structures are simplified as beam models. The structure and piles are coupled through a rigid foundation at the ground level. Buildings of various heights in Hong Kong designed to withstand wind load were analyzed using the present model. …


Analysis And Behavior Of A Rigid Foundation Massif Under The Effect Of Vibrations (Application Of Barakan Method), Iddir Rabah, Laradi Nadir Mar 2001

Analysis And Behavior Of A Rigid Foundation Massif Under The Effect Of Vibrations (Application Of Barakan Method), Iddir Rabah, Laradi Nadir

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This communication proposes a count mode of a rigid foundation massif frequencies, relaxing on a homogeneous soil, semi-infinite having an elastic linear behavior. Several data programs process using the finite elements method, are proposed for the dynamic analysis. Nevertheless, these programs don’t appear the physical phenomenon yielded, they depend on data introduced by the user and are applicable only for the elastic foundation massifs. The BARKAN method is an analytic one that appears the physical behavior of the different displacements and their coupling modes, the involvement of soil by its different dynamic stiffness modules, as well as a constant verification …


An Effective Local Absorbing Boundary For 3d Fem Time Domain Analyses, Lindita Kellezi, Hirokazu Takemiya Mar 2001

An Effective Local Absorbing Boundary For 3d Fem Time Domain Analyses, Lindita Kellezi, Hirokazu Takemiya

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The aim of this paper is to investigate and develop alternative methods for analyzing transient problems in dynamic soil-structure interaction, (SSI) within the FEM context. Development of a simple and efficient FEM procedure for the solution directly in the time domain of SSI problems is the main issue. Considering Direct Method of analysis, a new formulation of local transmitting boundaries for transient three-dimensional (3D) FEM analysis is presented based on the radiation criterion and strength-of- materials theory. These numerical devices can be considered as doubly asymptotic, (DA) approximations and are given in terms of first order differential operators. Different formulations …


Assessment Of The Foundation Of A Near Shore Power Plant Under Earthquake Loading, Hamid Fallah Mar 2001

Assessment Of The Foundation Of A Near Shore Power Plant Under Earthquake Loading, Hamid Fallah

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The foundation condition of a power plant in the south of Iran adjacent to Persian Gulf shore is discussed, taking into account the earthquake loading. Because of the high importance of the structures, advanced empirical, semi-empirical, and numerical methods have been employed, in order to verify the plant seismic safety. During empirical studies, the liquefaction potential of sandy interbred has been evaluated, using the well-known method of SPT and taking into account the percentage and type of fines. In studies, the undisturbed clayey samples and reconstituted sandy samples extracted from foundation soils have been tested with stress controlled cyclic triaxial …


Dynamics Ssi Analyses Considering Anisotropy Of The Foundation Gravelly Layer In Hualien, Taiwan, Yukihisa Tanaka Mar 2001

Dynamics Ssi Analyses Considering Anisotropy Of The Foundation Gravelly Layer In Hualien, Taiwan, Yukihisa Tanaka

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The Hualien Large-Scale Seismic Test program is under way to investigate Soil-Structure Interaction during large earthquakes in the field of Hualien, a high seismic region in Taiwan. In this paper, the ground of the test site, which consists of a sand layer and a hard gravelly layer, was characterized and modeled for accurate dynamic simulation analysis. Especially, the anisotropic behavior of the gravelly layer is modeled and simulation analysis of the forced vibration test is conducted. Consequently, it was revealed that anisotropic behavior of the gravelly layer observed in earthquake observation and forced vibration tests could be expressed by the …


Effects Of Liquefaction On Seismic Response Of A Storage Tank On Pile Foundations, Misko Cubrinovski, Kenji Ishihara, Takahiro Kijima Mar 2001

Effects Of Liquefaction On Seismic Response Of A Storage Tank On Pile Foundations, Misko Cubrinovski, Kenji Ishihara, Takahiro Kijima

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

During the 1995 Kobe earthquake widespread liquefaction occurred in fill deposits of man-made islands in the port area of Kobe. The liquefaction of thick fill deposits resulted in extensive sand boils, large lateral movement and settlement of the ground. A number of piles has been found damaged or collapsed due to the excessive ground response as above. One important observation from the Kobe earthquake was that fewer signs of liquefaction and lesser ground deformation were found in reclaimed deposits that have been treated by ground improvement measures. In order to investigate the effects of liquefaction and ground improvement on the …


Experimental, Theoretical And Numerical Evaluation Of The Stiffness Of A Soil-Foundation Model By Shaking-Table Test, M. R. Massimino, M. Maugeri, D. Novità Mar 2001

Experimental, Theoretical And Numerical Evaluation Of The Stiffness Of A Soil-Foundation Model By Shaking-Table Test, M. R. Massimino, M. Maugeri, D. Novità

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A well-controlled test was carried out on a Leighton Buzzard sand-shallow foundation system by means of the six-degree-of-freedom shaking table available at the University of Bristol. The foundation consists of a concrete block located into a flexible shear-stack (Taylor et al., 1994) filled up to 1.00 m with the sand. During the test the block was subjected to a centered vertical load and to one direction sine dwell-type acceleration applied at the base of the shear stack. The static and dynamic sand properties were evaluated through different laboratory tests, among them resonant column tests, cyclic and monotonic loading torsional shear …


Assessment Of Pile Group Response Under Lateral Load, Mohamed Ashour, Patrick Pilling, Gary Norris Mar 2001

Assessment Of Pile Group Response Under Lateral Load, Mohamed Ashour, Patrick Pilling, Gary Norris

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Assessment of the response of a laterally loaded pile group based on soil-pile interaction is presented in this paper. The behavior of a pile group in uniform and layered soil (sand and/or clay) is predicted based on the strain wedge (SW) model approach that has been developed to predict the response of a flexible pile under lateral loading. The pile group is characterized in terms of three-dimensional soil-pile interaction and then transformed into its one-dimensional beam on elastic foundation equivalent with associated parameters (modulus of sugrade reaction). Therefore, the interference among the piles in a group is determined based on …