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2010

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Articles 2191 - 2220 of 5375

Full-Text Articles in Engineering

Discussions On Dynamic Interaction Between Piles And Large Particle Rockfill, Yohsuke Kawamata, Scott A. Ashford May 2010

Discussions On Dynamic Interaction Between Piles And Large Particle Rockfill, Yohsuke Kawamata, Scott A. Ashford

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

A series of full-scale laterally loaded pile tests were conducted at the University of California, San Diego in 2007 in order to obtain a better understanding about pile-rockfill interaction for seismic design of port facilities. The project was composed of three experiments where the cyclic lateral loads were cyclically applied at the heads of the piles fully instrumented using a hydraulic actuator. Comparing the experimental and numerical results, assessments of p-y curves used for current design practice were performed. As a result, it was found that the soil pile springs currently used for design gave much lower lateral resistance than …

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Seismic Fragility Analysis For Sheet Pile Wharves — Case Study Of The Hualien Harbor In Taiwan, Yung-Yen Ko, Ho-Hsiung Yang, Cheng-Hsing Chen May 2010

Seismic Fragility Analysis For Sheet Pile Wharves — Case Study Of The Hualien Harbor In Taiwan, Yung-Yen Ko, Ho-Hsiung Yang, Cheng-Hsing Chen

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

The seismic fragility curves represent the conditional probabilities that the structural damage meets or exceeds the specified damage states at various levels of the ground motion parameters, such as peak ground acceleration (PGA). In this study, the seismic fragility analysis for the sheet pile wharves of the Hualien Harbor in Taiwan was performed. The finite element analysis software PLAXIS was adopted for the nonlinear dynamic analysis. The time histories of several representative earthquake events that actually occurred in Taiwan, including the 1999 Chi-Chi Earthquake, were scaled to various PGA levels as the input motions. Then the seismic responses of the …

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Calibration Of Soil Amplification Factors For Real-Time Ground-Motion Scenarios In Italy, Simone Barani, Roberto De Ferrari, Gabriele Ferretti, Daniele Spallarossa May 2010

Calibration Of Soil Amplification Factors For Real-Time Ground-Motion Scenarios In Italy, Simone Barani, Roberto De Ferrari, Gabriele Ferretti, Daniele Spallarossa

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

This study deals with the calibration of soil amplification factors to be used for generating site-specific, real-time (or quasi real-time) ground-motion scenarios in Italy. To this end, the ground response of 100 soil profiles is studied through 1-dimensional (1D) equivalent-linear numerical simulations. Several real, rock ground-motion time histories, grouped into different peak ground acceleration (PGA) classes, are driven through the models of the soil columns. Soil amplification factors are then calculated using different definitions, either as the ratio of the spectral acceleration at the surface to the spectral acceleration at the rock outcrop or by dividing the (acceleration or pseudo-velocity) …

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Evaluating Seismicity Parameters Of Sanandaj, Iran Based On Instrumental Earthquakes, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Motaza Taghizadeh May 2010

Evaluating Seismicity Parameters Of Sanandaj, Iran Based On Instrumental Earthquakes, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Motaza Taghizadeh

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

The main goal of this paper is to evaluate the seismic parameters of Sanandaj, Iran. For this reason, at first, all the occurred instrumental earthquakes (1900-2006) in a radius of 200 km of Sanandaj city have been gathered. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters by Gutenberg-Richter method, cumulative distribution functions, and Kijko-Sellevoll approach. This paper aims at estimation of seismicity parameters based on the seismic events and the relation between the cumulative frequency of earthquake occurrence and its magnitude. For this purpose the variable windows in time …

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Uniform Seismic Hazard Spectra Of Sanandaj, Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Seyed Ali Razavian Amrei May 2010

Uniform Seismic Hazard Spectra Of Sanandaj, Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Seyed Ali Razavian Amrei

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

This paper presents uniform seismic hazard spectra of Sanandaj city of Iran. Sanandaj is the administrative center of Kurdistan province, in which more than 500,000 people live in. A collected catalogue, containing both historical and instrumental events and covering the period from the 10th century BC to the year 2006, is used. Then seismic sources and The seismotectonic model of the considered region have been modeled within the radius of 200 km and recurrence relationship is established. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters. For this purpose the …

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Earthquake Induced Excess Pore Water Pressures In The Upper San Fernando Dam During The 1971 San Fernando Earthquake, Abouzar Sadrekarimi, Timothy D. Stark May 2010

Earthquake Induced Excess Pore Water Pressures In The Upper San Fernando Dam During The 1971 San Fernando Earthquake, Abouzar Sadrekarimi, Timothy D. Stark

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

The excess pore water pressure developed in the Upper San Fernando Dam during the 1971 San Fernando Earthquake has been evaluated in several studies. Almost all of these studies indicate large excess pore pressure ratios developed only in the upstream and downstream shells which are not consistent with the limited deformation of the dam and the piezometer responses during the earthquake. In this paper, the construction and field observations of the behavior of the Upper San Fernando Dam are reviewed and a simple approach involving Newmark’s (1965) and Makdisi-Seed’s (1978) permanent deformation and limit equilibrium slope stability analyses are used …

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Vibro Replacement For Liquefaction Hazard Mitigation For Operational Storage Facility In Coronado, California, Usa, Sunil Arora, Lisheng Shao May 2010

Vibro Replacement For Liquefaction Hazard Mitigation For Operational Storage Facility In Coronado, California, Usa, Sunil Arora, Lisheng Shao

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

Vibro replacement stone columns were installed for soil improvement for the construction of a 20,000-square-foot operational storage facility in Coronado, CA. The soil improvement program was conducted to meet seismic and static performance criteria for spread footings founded on improved soil. CPT testing was conducted before and after stone column construction to verify the vibro replacement program. Comparison between pre- and post-construction CPTs showed remarkable increase in the tip resistance in loose sand layers. Accounting for densification and shear reinforcement, the anticipated post-improvement liquefaction-induced settlement was reduced significantly.

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Dynamic Earth Pressures And Earth Pressure Cell Measurements, Yasir Ramzan Khokher, Gopal Madabhushi May 2010

Dynamic Earth Pressures And Earth Pressure Cell Measurements, Yasir Ramzan Khokher, Gopal Madabhushi

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

Retaining Wall failures have frequently occurred during seismic events and have therefore been the subject of much research. The pseudo-static force designs, based on the Mononobe-Okabe earth pressure coefficient equations, have been adopted by most current design codes due to its simplicity and ease of use. However, it is clear that there are limitations attached with this approach and more research is required into how the earth pressures develop during seismic events. This paper investigates the seismic behaviour of sheet pile retaining walls using centrifuge testing facilities. In addition to using bending moment strain gauges on the wall, new generation …

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Investigation Of The Coefficient Of Earth Pressure For Improved Ground By Compaction Grouting In The Full-Scale Field Liquefaction Experiment, Hiroshi Nakazawa, Takahiro Sugano, Takashi Shinsaka, Masaki Adachi, Kazuhiro Yamada May 2010

Investigation Of The Coefficient Of Earth Pressure For Improved Ground By Compaction Grouting In The Full-Scale Field Liquefaction Experiment, Hiroshi Nakazawa, Takahiro Sugano, Takashi Shinsaka, Masaki Adachi, Kazuhiro Yamada

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

This paper describes the effect of countermeasures for liquefaction by compaction grouting, which was investigated by the experiment of full-scale field liquefaction by controlled blast technique. The experiment was conducted to assess the performance of airport facilities subjected to liquefaction, to investigate damage mechanism, and to estimate the effect of countermeasures for liquefaction by compaction grouting applied to liquefiable sand layer under runway pavement. In this study, before and after grouting and after artificial liquefaction caused by in-situ blasting, self boring pressure-meter tests at the center and the edge of a grouted area were carried out to investigate the coefficient …

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Shaking Table Methodology And Instrumentation For Reinforced Soil Retaining Walls, Saman Zarnani, Richard J. Bathurst, W. Andy Take May 2010

Shaking Table Methodology And Instrumentation For Reinforced Soil Retaining Walls, Saman Zarnani, Richard J. Bathurst, W. Andy Take

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

The paper describes a testing methodology, instrumentation array and example data interpretation for reduced-scale geosynthetic reinforced soil (GRS) wall models built on a large shaking table. The testing program is unique in the literature because of the large number of different instruments deployed and the use of Particle Image Velocimetry (PIV) analysis of imagery captured using a high speed camera. The models are instrumented with strain gauges and extensometers attached to the geogrid reinforcing layers, LVDTs attached to the facing panel, load cells at the wall toe, reinforcement-facing load measurement, and accelerometers in the backfill and along the facing. Example …

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Three-Dimensional Stability Analysis Of The Central Rotunda Of The Catacombs Of Kom El-Shoqafa, Alexandria, Egypt, Sayed Hemeda, Kyriazis Pitilakis, Elias Bakasis May 2010

Three-Dimensional Stability Analysis Of The Central Rotunda Of The Catacombs Of Kom El-Shoqafa, Alexandria, Egypt, Sayed Hemeda, Kyriazis Pitilakis, Elias Bakasis

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

A three-dimensional numerical model has been proposed of the central Rotunda of the catacombs of Kom El-Shoqafa with its six supporting rock pillars, excavated in sandy oolitic limestone deposit. The model was based on a 3D realistic simulation of the problem geometry. The required input for the analysis (strength and deformability of the rock materials) was derived from laboratory tests and empirical assessments. The rock mass in general is normally widely jointed (> 1 m). In the analysis it is considered as an un-jointed homogeneous medium with low strength. Where 2D analysis fails to model properly the column behaviour, we …

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Monotonic And Cyclic Behavior Of Helical Screw Piles Under Axial And Lateral Loading, Yasser Abdelghany, M. Hesham El Naggar May 2010

Monotonic And Cyclic Behavior Of Helical Screw Piles Under Axial And Lateral Loading, Yasser Abdelghany, M. Hesham El Naggar

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

The main objectives of this research paper are to: investigate the monotonic and cyclic behavior of helical pile foundation systems, develop new helical screw systems suitable for seismic retrofitting of existing foundations and new structures. The proposed new pile configurations proposed include: fiber reinforced polymer grouted helical screw piles (FRP-G-HSP); and reinforced grouted helical screw piles (RG-HSP) with steel fibers added to the grout. The research methodology involved conducting more than one hundred full scale field load tests on twenty three helical screw piles installed in cohesive soil and subjected to axial and lateral monotonic and cyclic loading in which …

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Understanding Seismic Embankment Dam Behavior Through Case Histories, Pedro Simão Sêco E Pinto May 2010

Understanding Seismic Embankment Dam Behavior Through Case Histories, Pedro Simão Sêco E Pinto

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

From the lessons learned from past earthquakes, it is noticed that modern embankment dams withstand the design earthquake without significant damages. In spite of this scenario it is important to prevent the occurrence of incidents and accidents of embankment dams during the earthquakes and so a deep understanding of the triggering factors is important. Well documents case histories from many parts of the world related embankment dams behaviour during recent earthquakes were carefully selected and are discussed. Based in the governed factors attention is given to the requirements for materials characterization, modelling, analysis, monitoring and safety evaluation. Ageing effects and …

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Comparison Of Energies Required To Densify Liquefiable Soil, Russell A. Green, James K. Mitchell May 2010

Comparison Of Energies Required To Densify Liquefiable Soil, Russell A. Green, James K. Mitchell

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

The objective of the study presented herein is to compare the energy required to densify loose, liquefiable sand by various techniques and the energy required to liquefy the soil by earthquake shaking. The states-of-practice for performing remedial ground densification and evaluating earthquake liquefaction potential of loose saturated sands have evolved relatively independently of each other. This is in spite of the fact that the inducement of liquefaction is typically requisite for remedial ground densification of sands. Using the energy required to induce liquefaction as a common metric, simple calculations are presented for estimating the mechanical energy required to densify a …

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Performances Of Rockfill Dams During Recent Large Earthquakes, Kenji Ishihara May 2010

Performances Of Rockfill Dams During Recent Large Earthquakes, Kenji Ishihara

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

There has been increasingly high intensity of acceleration ever recorded during earthquakes in recent times. In consistence with this trend several characteristics have been unearthed regarding performances of rockfill dams. With due considerations to these, damage features of high rockfill dams during recent earthqukes in Japan and China are briefly introduced herein, together with those previously reported. As an indicator of overall distress to the dams, the crest settlement was taken up and it was shown that the settlement tends to increase up to about 1.5% of the height of the dam with increasing acceleration during earthquakes.

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Effects Of Sample Disturbance And Consolidation Procedures On Cyclic Strengths Of Intermediate Soils, Karina R. Dahl, Ross W. Boulanger, Jason T. Dejong, Michael W. Driller May 2010

Effects Of Sample Disturbance And Consolidation Procedures On Cyclic Strengths Of Intermediate Soils, Karina R. Dahl, Ross W. Boulanger, Jason T. Dejong, Michael W. Driller

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

Sampling and testing of soils to measure engineering properties, such as monotonic and cyclic undrained shear strengths, requires an understanding of the potential effects of sampling disturbance and the selection of appropriate laboratory testing procedures. For clays, past research has provided insights on how sampling methods and laboratory testing procedures can be used in practice to assess and minimize sample disturbance effects. For sands, past research has shown that conventional tube sampling techniques cause excessive disturbance to the soil fabric, such that subsequent measurement of monotonic or cyclic strengths can be greatly in error and misleading. For intermediate soils, the …

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Liquefaction, Screening, And Remediation Of Silty Soils, S. Thevanayagam May 2010

Liquefaction, Screening, And Remediation Of Silty Soils, S. Thevanayagam

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

Assessing liquefaction potential, in situ screening, and remediation of non-plastic silty soils are difficult problems. Presence of silt particles among the sand grains in silty soils affects the soil response in each of the above cases in different ways. First part of this paper addresses the effects of silt content on liquefaction resistance, hydraulic conductivity, and coefficient of consolidation of silty soils compared to clean sand. Secondly it addresses the effects of silt content and consolidation characteristics on cone resistance of silty soils and sand. A relationship between normalized cone resistance, liquefaction resistance, and consolidation characteristics is presented. The third …

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Principles And Practices Of Seismic Microzonation: Case Studies In India, T. G. Sitharam, P. Anbazhagan, K. S. Vipin May 2010

Principles And Practices Of Seismic Microzonation: Case Studies In India, T. G. Sitharam, P. Anbazhagan, K. S. Vipin

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

This paper presents an overview of the principles and practices of seismic microzonation with some case studies in India. India has experienced major damages and loss of life due to earthquakes. Macrozonation map in Indian seismic code IS-1893 is frequently revised soon after a major earthquake in the country. New revision which was published in 2002 after Bhuj earthquake in 2001 contains four macro zones. These zones are based on geology and limited seismology input without considering geotechnical aspects such as site effects and liquefaction. In order to understand the earthquake vulnerability of major urban centers and prepare new zonation …

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Reconnaissance Report Of The May 28, 2009 Honduras Earthquake, M 7.3, Ronaldo Luna May 2010

Reconnaissance Report Of The May 28, 2009 Honduras Earthquake, M 7.3, Ronaldo Luna

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

A team sponsored by the Earthquake Engineering Research Institute (EERI) and the Geoengineering Extreme Event Reconnaissance (GEER) Association carried out a field investigation in conjunction with Honduran colleagues from June 18-23 to document effects of the May 28 earthquake. The EERI-GEER team was invited by Mr. Marco Sandoval, Executive Director of the Comisión Ejecutiva Valle de Sula (CEVS). Mr. Sandoval sent a team of engineers to accompany the EERI-GEER team. The team included experts in structural, geotechnical engineering, as well as in disaster response and recovery. The investigators were supported by EERI: Abdeldjelil Belarbi and GEER: Ronaldo Luna and Kermit …

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General Report — Session 3, Dimitrios Zekkos, Adimoolam Boominathan, Adda Athanasopoulos-Zekkos May 2010

General Report — Session 3, Dimitrios Zekkos, Adimoolam Boominathan, Adda Athanasopoulos-Zekkos

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

No abstract provided.

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General Report — Session 4, Ronaldo Luna, Panos Dakoulas, Wei Zheng, K. Önder Çetin, Mary Perlea, Gordon Tung-Chin Kung, Usama El Shamy, Simone Barani May 2010

General Report — Session 4, Ronaldo Luna, Panos Dakoulas, Wei Zheng, K. Önder Çetin, Mary Perlea, Gordon Tung-Chin Kung, Usama El Shamy, Simone Barani

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

No abstract provided.

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General Report — Session 5, George E. Mylonakis, Achilleas Papadimitriou, Nikos Gerolymos May 2010

General Report — Session 5, George E. Mylonakis, Achilleas Papadimitriou, Nikos Gerolymos

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

No abstract provided.

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Table Of Contents, Multiple Authors May 2010

Table Of Contents, Multiple Authors

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

No abstract provided.

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Cyclic Compression Of Compacted Clayey Sand At Small Cyclic Strains, Mladen Vucetic, Macan Doroudian, David W. Sykora May 2010

Cyclic Compression Of Compacted Clayey Sand At Small Cyclic Strains, Mladen Vucetic, Macan Doroudian, David W. Sykora

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

Ten drained cyclic strain-controlled direct simple shear tests were conducted on compacted low-plasticity clayey sand to measure its cyclic compression properties. The soil had 37 % fines, liquid limit of 28% and plasticity index 14. The relative compaction of specimens prior to consolidation and cyclic shearing was between 80 and 90 %. Cyclic compression is expressed as the accumulation of vertical strain with the number of cycles, N. Vertical strain recorded at the end of every cycle, ενc, increased with the cyclic shear strain amplitude, γc, and N. Such behavior is typical and has been obtained …

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Constitutive Models Predicting The Response Of Clays Along Slip Surfaces, Constantine A. Stamatopoulos May 2010

Constitutive Models Predicting The Response Of Clays Along Slip Surfaces, Constantine A. Stamatopoulos

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

The paper proposes and validates a constitutive model simulating the change of resistance along clay slip surfaces under both undrained and drained conditions. The proposed model is based on (a) the critical state theory and (b) the assumption that the critical state changes once failure is reached, in terms of the further shear displacement. Under undrained conditions, the proposed model simulates the excess pore pressure generation and subsequently the continuous change of clay resistance along the slip surface from its initial value to the peak strength and then at large displacement the residual value measured in constant-volume ring shear tests. …

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Dynamic Site Characterization By The Seismic Dilatometer Marchetti Test In Central Italy, Antonio Cavallaro, Salvatore Grasso, Michele Maugeri May 2010

Dynamic Site Characterization By The Seismic Dilatometer Marchetti Test In Central Italy, Antonio Cavallaro, Salvatore Grasso, Michele Maugeri

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

This paper describes and compares the results of in situ and laboratory investigations performed on two Italian sites: St. Giuliano di Puglia (CB) located in the Molise region and Tito Scalo (PZ) located in the Basilicata Region. The tests were carried out to determine the variation of shear wave velocity with depth and strain level by Seismic Dilatometer Marchetti Test (SDMT), Cone Penetration Test (CPT), Noise Analysis Surface Waves (NASW), Down-Hole (DH) Test and Resonant Column Tests (RCT). Some considerations on shear modulus degradation evaluation by SDMT are proposed. The available data also enabled one to compare the shear modulus …

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Effect Of Degree Of Weathering On Dynamic Properties Of Weathered Granite Soils, Woong Jong Park May 2010

Effect Of Degree Of Weathering On Dynamic Properties Of Weathered Granite Soils, Woong Jong Park

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

The strength-deformation characteristics of weathered granite soils are determined by the characteristic of bedrock before the weathering and weathering environment. Generally, the degree of weathering is changes with depth and affects the dynamic properties of soil. But there are very few studies of the effect of degree of weathering on dynamic properties of soils in Korea. In this study, dynamic tests were performed with resonant column after preparing the specimens which were remolded with disturbed soils, and the effect of degree of weathering on dynamic properties, such as shear modulus, damping ratio is considered. In addition, the relationships among shear …

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Estimating Liquefaction Potential If A 200,000-Year Old Sand Deposit Near Georgetown, South Carolina, Aaron J. Geiger, Ronald C. Boller, Ronald D. Andrus, Tahereh Heidari, Hossein Hayati, William M. Camp Iii May 2010

Estimating Liquefaction Potential If A 200,000-Year Old Sand Deposit Near Georgetown, South Carolina, Aaron J. Geiger, Ronald C. Boller, Ronald D. Andrus, Tahereh Heidari, Hossein Hayati, William M. Camp Iii

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

A geotechnical experimentation site is being developed near Georgetown, South Carolina, to study the effect of soil age on liquefaction resistance. The site is located in an area called Hobcaw Barony on a 200,000-year-old beach to barrier-island sand deposit. Initial investigations conducted at the site include seismic cone penetration tests with pore pressure measurements, standard penetration tests with energy measurements, seismic crosshole tests, dilatometer testing, and fixed-piston sampling. Shear-wave velocities calculated from seismic cone test results are based on the true-interval method. The near-surface sand deposit extends from the ground surface to a depth of 8.5 m. The groundwater table …

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On The Influence Of The Grain Size Distribution Curve On Dynamic Properties Of Quartz Sand, Torsten Wichtmann, Theodor Triantafyllidis May 2010

On The Influence Of The Grain Size Distribution Curve On Dynamic Properties Of Quartz Sand, Torsten Wichtmann, Theodor Triantafyllidis

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

The paper reports on our effort to extend the well-known Hardin's equation by the influence of the grain size distribution curve. The study is motivated by the fact that Hardin's equation with its commonly used constants can significantly over-estimate the small strain shear modulus Gmax of well-graded sands. Approximately 350 resonant column (RC) tests with additional P-wave measurements have been performed on 33 specially mixed grain size distribution curves of a quartz sand with different mean grain sizes d50, coefficients of uniformity Cu = d60/d10 and fines contents FC. The experiments show that …

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Recovery Of Elastic Parameters For Cross-Anisotropic Sandy Soil Via Elastic Wave Measurements, Omer Faruk Capar, Isao Ishibashi May 2010

Recovery Of Elastic Parameters For Cross-Anisotropic Sandy Soil Via Elastic Wave Measurements, Omer Faruk Capar, Isao Ishibashi

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

In this study, the elastic properties of loose to medium dense (Dr=50%) sandy soil were obtained from elastic wave propagation techniques in the laboratory. The soil specimens were assumed cross anisotropic medium. Two bender elements are embedded in the top cap and the pedestal of the triaxial device as receivers and transmitters in the vertical direction for P- and S-waves. In addition, two bender elements are attached to the membrane surrounding the soil specimen to measure horizontal P-wave velocities. After the preparation of the specimens, vertical and horizontal P-wave velocities and a vertical shear wave velocity were measured under different …

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