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Articles 61 - 90 of 432
Full-Text Articles in Geotechnical Engineering
Vibration Analysis Of Rotating Fans Mounted On Adjacent Rectangular Foundation Blocks, C. B. Crouse, Ethan Dawson, Pedro Amaya, Prabir Sen
Vibration Analysis Of Rotating Fans Mounted On Adjacent Rectangular Foundation Blocks, C. B. Crouse, Ethan Dawson, Pedro Amaya, Prabir Sen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Vibration analysis was conducted for large rotating fans mounted on adjacent rectangular concrete foundation blocks, 66 ft x 22 ft x 10 ft depth, with the adjacent long sides 10 ft apart. The blocks were embedded in medium dense sands and gravels with a variable shear-wave velocity profile. The purpose of the analysis was to determine whether (1) the dynamic interaction of the blocks through the surrounding soil would cause unacceptable vibratory response of the fans, and (2) the foundation stiffness criterion set by the vendor was satisfied. Solutions were obtained using the 3-D dynamic version of the FLAC computer …
Viscous Damping For Time Domain Finite Element Analysis, Nien-Yin Chang, Hien Manh Nghiem
Viscous Damping For Time Domain Finite Element Analysis, Nien-Yin Chang, Hien Manh Nghiem
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Earthquake waves propagate mainly in rock mass from hypocenter to the bedrock directly underneath a monitoring station. Then, it propagates as shear waves from the bedrock to a geophone, where the surface motion is measured. For a deposit with uniform soil layers of horizontal interfaces, one-dimensional finite element analysis can be performed to analyze the dynamic responses of a horizontal soil deposit. In an ideal dynamic soil-structure interaction analysis, seismic waves are propagated from the bedrock through soils and foundations, and then to structure. Thus, it is necessary to obtain the bedrock motion from a measured surface motion registered in …
A Validation Study Of A Seismically Induced Ground Strain Model Using Strong Motion Array Data, Timothy D. Ancheta, Jonathan P. Stewart
A Validation Study Of A Seismically Induced Ground Strain Model Using Strong Motion Array Data, Timothy D. Ancheta, Jonathan P. Stewart
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This study concerns ground strains that result from spatially variable ground motions unrelated to ground failure. Prior empirical work shows a dependence of peak ground strain (PGS) on peak ground displacement (PGD) but is applicable only for weak motions (PGD < 10 cm). Prior semi-empirical work, in which strains were evaluated from simulated ground motions that preserve the coherency, Fourier amplitude variability and wave passage observed in array recordings, found a similar dependence of PGS on PGD but also a significant dependence on separation distance of observation points. Here we describe a procedure to calculate PGS between pairs of stations in an array to test the separation dependence of PGS. The Lotung LSST array was selected due to its closely spaced stations (6 to 85 m) and large number of recordings. The PGS estimated from station pairs from 11 events illustrate that the distance dependence of PGS is statistically significant, with PGS increasing as separation distance decreases.
Development Of Seismic Safety During Pre- And Co-Seismic Periods, Arun Bapat
Development Of Seismic Safety During Pre- And Co-Seismic Periods, Arun Bapat
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Since the year 2000 a large number of earthquakes have taken place. But despite advances in disaster management and seismology, till now it has not been possible to save a single life during earthquake. Issue of forewarning based on reliable seismic precursors has not been considered. Large magnitude earthquakes in India, Indonesia, Pakistan, Iran, China, Italy, and Peru etc were unexpected jolts to the disaster managers. Practically each earthquake has taken heavy death toll in India, Pakistan, Iran, and China etc. If some precursory warning were issued, it would help in saving at least some lives. The issue of earthquake …
Effect Of Topographical Irregularities On Seismic Earthquake Response Of Construction Site – 2d Numerical Analysis Of Trapezoidal Valley Under Real Motion, Hamed Khodadadi Tirkolaei, Morteza Jiryaei Sharahi
Effect Of Topographical Irregularities On Seismic Earthquake Response Of Construction Site – 2d Numerical Analysis Of Trapezoidal Valley Under Real Motion, Hamed Khodadadi Tirkolaei, Morteza Jiryaei Sharahi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Documented observation of destruction distribution after seismic events suggest to topography effects on earthquake intensity. But there exist very few –if any- well documented case studies where topography effects are illustrated for strong ground motion. This is due to complex nature of seismic scattered wave by topographical structures to medium. Although some empirical correlations, obtained from statistical analyses, were proposed in different studies to consider this issue, but these correlations also may not be applicable in general or may be overestimation of what happen in reality. These difficulties and disadvantages can only be solved accurately, economically and under realistic conditions …
Evaluation Of Seismic Response Of A Site Class F Site Using Equivalent Linear And Nonlinear Computer Codes, King H. Chin, Braydan Duree, Whitney Trent, Gustavo Ordonez
Evaluation Of Seismic Response Of A Site Class F Site Using Equivalent Linear And Nonlinear Computer Codes, King H. Chin, Braydan Duree, Whitney Trent, Gustavo Ordonez
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Evaluation of seismic site response and development of site-specific surface response spectra has evolved in recent years through the use of both equivalent linear (EQL) and nonlinear (NL) computer codes. Before the nonlinear computer codes become popular among practitioners, equivalent linear site response analysis programs were used to develop site-specific design spectra for both soft and stiff sites. Nonlinear site response analysis is now used more routinely for projects planned on Site Class F sites. This paper presents the results of seismic response analyses completed for a Site Class F site at Grays Harbor, Washington. Both the equivalent linear (SHAKE2000) …
Example For Risk Estimation Of Fault Appearance Under The Place Of Designed Skyscraper In Sofia, Chavdar V. Kolev, Martina G. Perikliyska
Example For Risk Estimation Of Fault Appearance Under The Place Of Designed Skyscraper In Sofia, Chavdar V. Kolev, Martina G. Perikliyska
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
There was an interesting discussion during the designing stage of one of the future skyscrapers in Sofia – is the soil basement reliable enough if it is true the hypotheses for a fold under the construction place? The substantial geotechnical report doesn’t give answers to this question but the geological profiles suggest to us about an appearance of fold. Topographic and historical specifics of the area are supporting the same unsuitable idea. The additional geophysics investigations clearly establish a lack of fold displacements under the place during the Quaternary period. The zone has high seism and an individual seismic ratio …
Ground Motion Occurrence Rates For Scenario Spectra, Norman Abrahamson, A. Anil Yunatci
Ground Motion Occurrence Rates For Scenario Spectra, Norman Abrahamson, A. Anil Yunatci
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
It is common practice for probabilistic seismic hazard analysis (PSHA) to use the uniform hazard spectra (UHS) to describe the ground motion. A short-coming of UHS is that it represents an envelope of many different earthquakes that control the hazard at different spectral periods. As an alternative, the UHS can be broken into a suite was developed by Baker and Cornell (2006), in which conditional mean spectra (CMS) are developed that represent realistic earthquake scenarios given a specified spectral acceleration at a single period. Using only the CMS as scenarios is too restrictive and does not provide enough scenarios to …
Selection Of An Appropriate AMax For Liquefaction Analyses From One-Dimensional Site Response Analyses, Rabia Z. Sarica
Selection Of An Appropriate AMax For Liquefaction Analyses From One-Dimensional Site Response Analyses, Rabia Z. Sarica
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper is an attempt to clarify a possible confusion regarding which maximum ground acceleration (amax) should be used when performing a site-specific liquefaction analysis. Usually, one-dimensional free-field site response analysis is performed to estimate amax at the foundation elevation and the strain-compatible soil parameters within the soil profile. From the soil-structure interaction (SSI) analysis perspective, this calculation is repeated for the best-estimate, lower-bound, and upper-bound soil profiles. For this, the shear moduli are adjusted using a coefficient of variation (cv) to account for the spatial variation in the soil properties and the uncertainties in …
The Levelled-Energy Multifrequencial Analysis For Deriving Dynamic Equivalent Signals (Lema_Des): Application For An Earthquake Scenario, Luca Lenti, Salvatore Martino
The Levelled-Energy Multifrequencial Analysis For Deriving Dynamic Equivalent Signals (Lema_Des): Application For An Earthquake Scenario, Luca Lenti, Salvatore Martino
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An equivalent acceleration signal can be regarded as an acceleration time history, inferred from a reference acceleration record which can be defined in different ways on the basis of different equivalence criteria such as: 1) kinematic characteristics of the signal; 2) Fourier spectrum amplitude; 3) Fourier spectrum phase values; 4) response spectrum; 5) energy. The equivalent signals may be employed in technical-scientific applications, when common theoretical approaches or instrumental devices can hardly manage the whole complexity of the actual phenomena to be investigated. As their definition suggests, equivalent signals are full-fledged analogue tools for modelling natural processes (real prototypes) as …
Variability In Earthen Levee Seismic Response Due To Time-History Selection, Adda Athanasopoulos-Zekkos
Variability In Earthen Levee Seismic Response Due To Time-History Selection, Adda Athanasopoulos-Zekkos
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In seismic slope stability analyses the single most important input parameter is the ground motion. Time-history selection is a challenging engineering problem since the variability in ground motion characterization is in part due to the complexity of the mechanisms that result in a seismic event taking place and the path and soil conditions from the origin of the seismic event to the location of interest. In this study, the effect of key ground motion parameters to the dynamic response of earthen levees is investigated. Specifically, the effect on the induced cyclic shear stress ratio (CSR) and/or seismically induced Newmark-type, permanent …
A Study On The Seismic Response Of Ground And Reinforced Concrete Buildings In Belgaum Region, India, L. Govindaraju, C. A. Madhusudhan, S. S. Quadri
A Study On The Seismic Response Of Ground And Reinforced Concrete Buildings In Belgaum Region, India, L. Govindaraju, C. A. Madhusudhan, S. S. Quadri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In the recent years, each unpredictable earthquake (for example Kobe, 1995; Taiwan, 1999; Kocaeli, 1999 and Bhuj, 2001) has revealed its own saga of destruction and failure of engineered structures. Therefore, regional variation in potential earthquake damage should be carefully assessed for better planning towards disaster mitigation. This requires assessment of the seismic ground motion parameters. The present study focus on the seismic response of ground and reinforced concrete buildings in Belgaum region (located in zone III, as per IS 1893–Part1: 2002) in Karnataka state. At present no strong motion records are available in this region and therefore, wavelet-based spectrum …
Displacement Design Spectrum Model Accounting For Non-Linear Site Effects, Hing-Ho Tsang, M. Neaz Sheikh, Srikanth Venkatesan, Nelson T. K. Lam
Displacement Design Spectrum Model Accounting For Non-Linear Site Effects, Hing-Ho Tsang, M. Neaz Sheikh, Srikanth Venkatesan, Nelson T. K. Lam
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Displacement design response spectrum is an essential component for the currently-developing displacement-based seismic design and assessment procedures. This paper proposes a new and simple method for constructing displacement design response spectra on soft soil sites. The method takes into account modifications of the seismic waves by the soil layers, giving due considerations to factors such as the level of bedrock shaking, material non-linearity, seismic impedance contrast at the interface between soil and bedrock, and plasticity of the soil layers. The model is particularly suited to applications in regions with a paucity of recorded strong ground motion data, from which empirical …
Effective Stress V/S Total Stress Ground Response Analyses For A Typical Site In Chennai (India), R. Uma Maheswari, A. Boominathan, G. R. Dodagoudar
Effective Stress V/S Total Stress Ground Response Analyses For A Typical Site In Chennai (India), R. Uma Maheswari, A. Boominathan, G. R. Dodagoudar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents the results of ground response analyses carried out for a typical sandy site in Chennai city by equivalent linear and nonlinear total and effective stress approaches. The soil profile at the site consists of 26m thick sandy layer with SPT blow count increases from 16 to above 50 with depth. The shear wave velocity profile measured using field Multichannel Analysis of Surface Wave (MASW) test is found to increase from 170 m/s to 400 m/s at 26m depth. The equivalent linear ground response analysis was carried out using SHAKE2000. The nonlinear total and effective stress analyses were …
Evaluation Of Frequency Dependent Equivalent Linear Analysis, Chang-Gyun Jeong, Dong-Yeop Kwak, Duhee Park, Kwangkyun Kim
Evaluation Of Frequency Dependent Equivalent Linear Analysis, Chang-Gyun Jeong, Dong-Yeop Kwak, Duhee Park, Kwangkyun Kim
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
One dimensional equivalent linear site response analysis is widely used in practice due to the simplicity and ease of use. In the method, the dynamic soil properties are assumed to be independent of the loading frequency. To better simulate the nonlinear behavior, equivalent analysis methods that models the loading frequency dependence of the shear modulus and damping were developed. The backbone of the methods is the frequency-dependent shear strain curves. Various forms of the frequency-dependent shear strain curves were developed. However, the effect of the frequency - shear strain curves are not well known and documented. In this study, a …
Evaluation Of Local Site Conditions Using Ambient Seismic Noise Recordings: A Case Study From Ankara, Turkey, M. K. Koçkar, H. Akgün
Evaluation Of Local Site Conditions Using Ambient Seismic Noise Recordings: A Case Study From Ankara, Turkey, M. K. Koçkar, H. Akgün
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper aims to investigate the site response of the sediment characteristics and to perform seismic hazard studies in Ankara, Turkey through conducting short-period noise recordings of microtremor measurements at 352 project site locations on the Upper Pliocene to Pleistocene fluvial and particularly Quaternary alluvial and terrace sediments in the Ankara basin. The spectral ratios relative to a firm site reference station (SSR) and the spectral ratio between the horizontal and vertical components (HVSR) of the microtremor measurements at the ground surface have been used to estimate the fundamental periods and the amplification factors of the site. The results of …
Layers Heights Randomness Effect On Seismic Response Of A Site In Algiers (Algeria), M. Badaoui, M. K. Berrah, A. Mebarki
Layers Heights Randomness Effect On Seismic Response Of A Site In Algiers (Algeria), M. Badaoui, M. K. Berrah, A. Mebarki
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper deals with the stochastic seismic analysis of a site in the city of Algiers (Algeria), which is composed by superposed layers over an elastic halfspace. Layers heights are assumed to be random variables with a lognormal distribution, which is suitable for strictly non-negative random variables. The analysis is carried out via Monte Carlo simulations coupled to the stiffness matrix method. A parametric study is conducted do derive the stochastic behavior of the extreme ground acceleration, its response spectrum and the transfer function. The soil height coefficient of variation is varied from 0 (corresponding to the homogeneous case) to …
Multidisciplinary Study Of Seismic Wave Amplification In The Historical Center Of Rome, Italy, Fabian Bonilla, Anna Chiara Giacomi, Francesca Bozzano, Luca Lenti, Celine Gélis, Salvatore Martino, Jean-François Semblat
Multidisciplinary Study Of Seismic Wave Amplification In The Historical Center Of Rome, Italy, Fabian Bonilla, Anna Chiara Giacomi, Francesca Bozzano, Luca Lenti, Celine Gélis, Salvatore Martino, Jean-François Semblat
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Assessment of potential strong ground motion within the city of Rome is crucial to preserve its millenary monumental heritage and protect its large urban settlements. Rome is located at a distance of some tens of kilometers from the central Apennines seismogenic zone, where earthquakes of tectonic origin and of a magnitude of up to 7.0 are expected. The geological bedrock is mainly represented by high - consistency fine grained marine sedimentary deposits Pliocene to lower Pleistocene aged and named Monte Vaticano Unit. An upper Pleistocene – Holocene succession of fluvial deposits partially fill the paleo-valley of the Tiber river and …
Site Response Study Of Deep Soil Column In Lucknow, India, P. Anbazhagan, Abhishek Kumar, T. G. Sitharam
Site Response Study Of Deep Soil Column In Lucknow, India, P. Anbazhagan, Abhishek Kumar, T. G. Sitharam
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Earthquake activities in the many parts of world had shown the importance of local soil condition in the propagated wave motion. In this paper an attempt has been made to estimate site effects of deep soil column in Lucknow, Indo-Gangetic basin for scenario earthquakes at Himalayan plate boundary. Based on previous study, the synthetic ground motion has been generated using Stochastic Finite Fault model (FINSIM) for two scenario earthquakes at seismic gaps. One seismic gap called as western location/seismic gap is located about 307.88km from site and gives the peak ground acceleration of 0.11g at site. Another one is the …
Site Specific Seismic Analysis Of A Deep Stiff Soil Site, S. Krishna Kumar, A. Boominathan
Site Specific Seismic Analysis Of A Deep Stiff Soil Site, S. Krishna Kumar, A. Boominathan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Site specific analysis was carried out for a deep stiff soil site located near Ahmedabad, India. The site predominantly consists of sandy clay and silty sand layer in the top 30m with Vs varying from 430 to 750m/s. It is followed by a high plastic stiff clay layer cemented with sand and gravel with unusually high Vs above 1000m/s. The study region surrounded by 13 major faults has experienced several major earthquakes including the disastrous Bhuj earthquake (Mw=7.7). The seismic hazard level at the site was estimated by deterministic approach and the East Cambay fault with Mw of …
Site-Specific Response Analysis In The New Madrid Seismic Zone, Wei Zheng, Youssef Hashash, Mark M. Petersen, Andrew S. Whittaker
Site-Specific Response Analysis In The New Madrid Seismic Zone, Wei Zheng, Youssef Hashash, Mark M. Petersen, Andrew S. Whittaker
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A coal-fired power plant, Plum Point Energy Station, is being built in the city of Osceola, Arkansas, which is located in the New Madrid Seismic Zone (NMSZ). The project site is characterized as Site Class F, according to ASCE-7-05, because the soils at the site are prone to liquefaction. The depth of soil to rock is approximately 1 kilometer (km). A site-specific response study was required by the building code to determine the uniform hazard spectrum at the ground surface. The site-specific study included a probabilistic seismic hazard assessment to determine the Maximum Considered Earthquake (MCE) spectrum at an equivalent …
Topographic Site Effects Evaluation For The Monte Po Hill In The City Of Catania (Italy), Antonio Ferraro, Salvatore Grasso, Michele Maugeri
Topographic Site Effects Evaluation For The Monte Po Hill In The City Of Catania (Italy), Antonio Ferraro, Salvatore Grasso, Michele Maugeri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Monte Po Hill is located in the North-eastern part of the city of Catania; this area is prone to high seismic risk due to the presence of several constructions, including a school, in the vicinity of a toe of a slope, characterized by precarious stability conditions. The study has regarded the evaluation of site effects in correspondence of the site, to which corresponds a different value of the Seismic Geotechnical Hazard. In the beginning of 2007 a seismic station has been also located into the school building, with the aim of recording seismic events. Seismograms obtained by the seismic …
A Note On The Effect Of Non-Plastic Fines On The Liquefaction And Reconsolidation Volumetric Strain Behaviour Of Sands, T. G. Sitharam, B. V. Ravishankar, J. S. Vinod
A Note On The Effect Of Non-Plastic Fines On The Liquefaction And Reconsolidation Volumetric Strain Behaviour Of Sands, T. G. Sitharam, B. V. Ravishankar, J. S. Vinod
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper discusses the influence of non- plastic fines on the liquefaction and reconsolidation volumetric strain behaviour of sand based on the strain controlled cyclic triaxial experimental results. The investigations were carried out on sand samples collected from earthquake-affected area of Ahmedabad city of Gujarat state in India. Laboratory investigations were conducted on clean sand (prepared from the natural sand) samples with varying amount of non-plastic fines. Experimental results highlight a considerable influence of non-plastic fines on the resistance to liquefaction and reconsolidation volumetric strains behaviour during cyclic loading.
Application Of General Regression Neural Networks (Grnns) In Assessing Liquefaction Susceptibility, Suzan S. Salem, Khalid El-Zahaby
Application Of General Regression Neural Networks (Grnns) In Assessing Liquefaction Susceptibility, Suzan S. Salem, Khalid El-Zahaby
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Liquefaction is considered among the most important hazards associated with earthquakes. The damage resulting from seismic liquefaction may be huge; thus, there always exists needs to mitigate the damage associated with such risks. One of the main problems challenging geotechnical engineers is how to assess the seismic liquefaction hazard. Statistical and probabilistic approaches for seismic liquefaction are currently available. In this paper, a general regression neural networks approach (GRNNs) has been used to assess the liquefaction hazard in Egypt. Thus, data from new locations can be analyzed using GRNNs to obtain the liquefaction risk associated with this new site. The …
Assessment Of Liquefaction Potential Relevant To Choice Of Type And Depth Of Foundations In Seismically Active Areas, Hadži-Niković D. Gordana, Perković D. Ilija, Abolmasov Biljana
Assessment Of Liquefaction Potential Relevant To Choice Of Type And Depth Of Foundations In Seismically Active Areas, Hadži-Niković D. Gordana, Perković D. Ilija, Abolmasov Biljana
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
There is evidence of great increase of pore pressures in saturated sand soils during cyclic loading caused by earthquakes. These increased pore pressures can often increase to effective stresses in soil. Dependant on sand density, this can lead to a total loss of shear strength, liquefaction or greater deformability of soil. Emergence of liquefaction or great deformations within soil can cause significant damage or total destruction of constructions on the ground, even when they have been correctly designed. For this reason, it is very important to perform detailed geotechnical and seismic investigations of ground conditions and evaluate liquefaction potential for …
Assessment Of Liquefaction Susceptibility Of Geological Units In The Area Of Gulf Of Corinth, Greece, George Papathanassiou, Sotiris Valkaniotis, Spyros Pavlides
Assessment Of Liquefaction Susceptibility Of Geological Units In The Area Of Gulf Of Corinth, Greece, George Papathanassiou, Sotiris Valkaniotis, Spyros Pavlides
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The coastal area of Gulf of Corinth is characterized as medium to high seismicity zone since devastating earthquakes occurred during a 2500 years period. One of the most characteristic events is the 373 B.C. Eliki earthquake that triggered severe secondary effects including soil liquefaction and large scale landslides. The basic aim of this paper is the compilation of a map regarding the liquefaction susceptibility in the coastal area of Gulf of Corinth, Central Greece. In order to achieve this, we used data regarding the age and depositional process of sediments the value of peak ground acceleration (PGA) and the occurrence …
Case Histories Of Widespread Liquefaction And Lateral Spread Induced By The 2007 Pisco, Peru Earthquake, Jorge F. Meneses, J. Alva, B. Cox, V. Moreno, M. Olcese, R. Sancio, J. Wartman
Case Histories Of Widespread Liquefaction And Lateral Spread Induced By The 2007 Pisco, Peru Earthquake, Jorge F. Meneses, J. Alva, B. Cox, V. Moreno, M. Olcese, R. Sancio, J. Wartman
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Case histories of widespread liquefaction and lateral spread induced by the Mw 8.0, 2007 Pisco, Peru earthquake and observed during a post-earthquake GEER reconnaissance are presented. A long duration of the earthquake over 200 seconds and two phases of strong ground motion induced widespread liquefaction and lateral spread of sand coastal deposits and road embankments over a total length of approximately 100 km of coastal region. Six case histories of liquefaction are presented and discussed including a massive lateral spread of a marine terrace believed to be as large or even larger than that reported along the Shinano River …
Cyclic Instability Behaviour Of Sand-Silt Mixture Under Partial Cyclic Reversal Loading, Md. Abdul Lahil Baki, Sik-Cheung Robert Lo, Md. Mizanur Rahman
Cyclic Instability Behaviour Of Sand-Silt Mixture Under Partial Cyclic Reversal Loading, Md. Abdul Lahil Baki, Sik-Cheung Robert Lo, Md. Mizanur Rahman
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Flow liquefaction is one of the most catastrophic failure phenomena in geotechnical engineering. It is a form of instability and can be observed during monotonic loading or cyclic loading. It is referred to as static instability/liquefaction for monotonic loading and cyclic instability for cyclic loading. To investigate the link between these behaviours, a number of stress controlled cyclic triaxial tests were carried out on loose sand-silt mixture under cyclic ‘reversal’ and ‘non-reversal’ loading condition. Cyclic reversal loading was partial reversal. Its peak-trough magnitudes were chosen in such a way that cyclic instability was triggered in compression side of the stress …
Dem Simulation Of Liquefaction-Induced Lateral Spreading, Usama El Shamy, Mourad Zeghal, Ricardo Dobry, Tarek Abdoun, Sabanayagam Thevanayagam, Ahmed Elgamal
Dem Simulation Of Liquefaction-Induced Lateral Spreading, Usama El Shamy, Mourad Zeghal, Ricardo Dobry, Tarek Abdoun, Sabanayagam Thevanayagam, Ahmed Elgamal
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper reports the results of a model-based simulation of 1g shake table tests of sloping saturated granular deposits subjected to seismic excitations. The simulation technique utilizes a transient fully-coupled continuum fluid discrete particle model of the watersaturated soil. The fluid (water) phase is idealized at a macroscale using an Eulerian averaged form of Navier-Stokes equations. The solid particles are modeled at the microscale as an assemblage of discrete spheres using the discrete element method. The interphase momentum transfer is accounted for using an established relationship. Numerical simulations were conducted to investigate the liquefaction induced lateral spreading of a mild-sloped …
Effect Of Density On Critical Depth Of Liquefaction In A Soil Deposit Containing Double Loose Sand Lenses, S. M. Mir Mohammad Hosseini, Y. Pashang Pisheh, K. Shakiba Nia, N. Ganjian
Effect Of Density On Critical Depth Of Liquefaction In A Soil Deposit Containing Double Loose Sand Lenses, S. M. Mir Mohammad Hosseini, Y. Pashang Pisheh, K. Shakiba Nia, N. Ganjian
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Large surface deformations due to liquefaction have been observed in many soil deposits which seem to feature good geotechnical characteristics. These deformations are often caused by the liquefaction of sand layers surrounded by clayey or silty soils called “sand lenses”. Liquefaction potential often decreases with increasing of depth. Hence, a specific depth of embedment of the lenses can be defined below which liquefaction would unlikely happen or the consequential surface deformation would be negligible. This depth is called critical depth. This research aims at studying the effects of the relative density of the sand within the lenses on the critical …