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Articles 31 - 60 of 432
Full-Text Articles in Geotechnical Engineering
Dynamic Properties Of Rubber Specimens, B. N. Madhusudhan, Jyant Kumar
Dynamic Properties Of Rubber Specimens, B. N. Madhusudhan, Jyant Kumar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Resonant column and bender element tests were conducted on rubber specimens to study their dynamic properties, namely, shear modulus (G), damping ratio (D) and Poisson’s ratio (ν). It was found that similar to soil specimens, with an increase in strain level, the shear modulus of rubber decreases continuously whereas the damping ratio increases. The tests were also carried out to find the effect of confining pressures on the rubber specimens. It was observed that for the rubber with the lesser hardness, there was a slight increase in the shear modulus and a decrease in the damping ratio values as the …
Dynamic Properties Of Sand In Constant-Volume And Constant-Load Tests, F. Jafarzadeh, H. Sadeghi
Dynamic Properties Of Sand In Constant-Volume And Constant-Load Tests, F. Jafarzadeh, H. Sadeghi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Constant-volume and constant-load tests were performed on Babolsar and Toyoura sands by using a modified SGI cyclic simple shear device which provides the capability of back pressure saturation. All tests were shear strain controlled and conducted under different values of relative density, vertical effective stress and shear strain amplitude. Results revealed that Dr, σ′v and γ affect shear modulus and damping ratio under both constant-volume and constant-load conditions in similar ways except the shear strain amplitude which has no important influence on damping of constant-volume tests. The effects of Dr, σ′v, γ and …
Evaluation Of Liquefaction Potential Of Soil By Down Borehole Method, Sumit Ghose, Ambarish Ghosh
Evaluation Of Liquefaction Potential Of Soil By Down Borehole Method, Sumit Ghose, Ambarish Ghosh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The procedure used in this research work for evaluation of liquefaction potential due to earthquake is by correlating the cyclic stress ratio(CSR) and the cyclic resistance ratio(CRR) obtained from standard penetration test and shear wave velocity. Shear wave velocity in the different layers of soils have been determined by the use of down borehole instrument. P- and S-wave velocity data of nearsurface soils (upper 21 m) are analyzed and correlated to depth and sedimentological properties. The results show that the S-wave velocity is much more sensitive to changes in lithology and mechanical properties than the P-wave velocity, which is characterized …
Failure Of Saturated Sand In Non-Symmetrical Cyclic Loading, J. Yang, H. Y. Sze
Failure Of Saturated Sand In Non-Symmetrical Cyclic Loading, J. Yang, H. Y. Sze
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Extensive experimental studies have been focused on the cyclic behavior of saturated sand under free-field level ground conditions when subjected to earthquake loading. In many practical applications involving earth dams, slopes and buildings, however, soil elements are always subjected to initial static driving shear stresses on the horizontal planes. The impact of initial shear stresses on cyclic behavior and strength of sand is not yet fully understood. The focus of the present study is placed on the initial shear impact on the failure mechanisms of saturated sand varying from loose to dense state. Three distinctly different cyclic failure patterns have …
Liquefaction Studies Of The Solani Sand Reinforced With Geogrid, Swami Saran, B. K. Maheshwari, H. P. Singh
Liquefaction Studies Of The Solani Sand Reinforced With Geogrid, Swami Saran, B. K. Maheshwari, H. P. Singh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper, a study on liquefaction resistance of Solani sand reinforced with geogrid sheets is reported. Tests were carried out on shake table (vibration Table) with sand samples prepared at relative density of 25% without and with geogrid sheets. In this investigation biaxial synthetic geogrid sheets having the dimension equal to plan dimension of the shake table tank were used in three different combinations of 3 layers, 4 layers and 5 layers at different depths within the sand sample. The liquefaction parameters such as maximum pore water pressure (Umax), maximum pore water pressure built up time (t …
Insar Technique To Allocate Land Subsidence In Karaj And Tehran (Shehriar, Waraminand Djadjroud) Areas, Jafar Najihamodi, Ramin Sadeghi
Insar Technique To Allocate Land Subsidence In Karaj And Tehran (Shehriar, Waraminand Djadjroud) Areas, Jafar Najihamodi, Ramin Sadeghi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Aquifer and hydro system compaction is a worldwide phenomenon, where there is a sudden sinking or gradual downward settling of the earth's surface with little or no horizontal motion. This phenomenon is noticed to take place in many countries, among which is Iran. Water well casing and installations in areas such as Hamedan , Kerman, Meshhed, Tehran and others seem to rise into the air, or some times to produce fissures in the sediments and/or showing sinkhole in carbonated rocks. Soil compaction and / or land subsidence could cause damages to surface and subsurface urban installations. UNISCO was interesting in …
Procedure To Evaluate Liquefaction-Induced Lateral Spreading Based On Shear Wave Velocity, Fred (Feng) Yi
Procedure To Evaluate Liquefaction-Induced Lateral Spreading Based On Shear Wave Velocity, Fred (Feng) Yi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Evaluation of liquefaction-induced lateral spreading is very important for the design of structures located on gently sloping ground and with relatively shallow groundwater. Extensive research has been performed on the calculation of liquefaction-induced lateral spreading based on the standard penetration test (SPT) and cone penetration test (CPT) data by various researchers (Bartlett and Youd 1992, 1995, Rauch, 1997; Zhang et al., 2004; Idriss and Boulanger, 2008). However, few published papers can be found that address the calculation of liquefaction-induced lateral spreading based on shear wave velocity. This paper presents a procedure to evaluate liquefaction-induced lateral spreading directly based on shear …
Seismic Behavior Of Nailed Soil Massifs, V. A. Barvashov, Ch. A. Dzhantimirov, I. M. Iovlev, P. V. Kharlamov, S. A. Rytov
Seismic Behavior Of Nailed Soil Massifs, V. A. Barvashov, Ch. A. Dzhantimirov, I. M. Iovlev, P. V. Kharlamov, S. A. Rytov
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Soil nailing technology can be successfully applied to strengthen natural soil massifs in seismic regions, provided adequate analysis is available. Conventionally, the design of soil nailing is performed iteratively: firstly parameters of nailing and their distribution are assigned, the safety factor of the nailed massif is calculated, if its value is less than 1 then nailing parameters are reassigned, etc. Such “trial and error” approach is laborious and especially so, because different types of ULSs shall be analyzed. The method, discussed in the paper, is based on assumption that the effect of nailing in soil with internal cohesion c=c(x,y) could …
Small Strain Properties Of Sands With Different Cement Types, Luling Yang, Lynn Salvati
Small Strain Properties Of Sands With Different Cement Types, Luling Yang, Lynn Salvati
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This research examines the small strain properties of Ottawa, Monterey and Michiana sands cemented in the laboratory with two different cementing agents using flush mounted transducers, bender elements, and resonant column tests. Samples cemented with higher strength cementing agents and higher cement contents had higher maximum shear modulus values and greater nonlinearity in the shear modulus reduction and damping curves. Although confining pressure is a significant factor for the small strain stiffness of uncemented sands, it did not affect the maximum shear modulus or the shear modulus reduction curves of the cemented sands tested. The density of the cemented samples …
The Universal Void Ratio Function For Small Strain Shear Modulus, Man T. Bui, C. R. I. Clayton, Jeffrey A. Priest
The Universal Void Ratio Function For Small Strain Shear Modulus, Man T. Bui, C. R. I. Clayton, Jeffrey A. Priest
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Small strain shear modulus, Gmax, is a key parameter representing the small strain response of soils under seismic load. It is also an important parameter in design of foundations where only small deformation takes place. It is recognised that Gmax is significantly influenced by void ratio. The influence of void ratio on Gmax of a soil has been taken into account by using an empirical void ratio function, F(e), and various forms of F(e) have been proposed. However, each F(e) can only be applied for a given soil within a limited void ratio range. There was …
Multi Channel Analysis Of Surface Wave (Masw) Testing For Dynamic Site Characterization Of Delhi Region, D. Neelima Satyam, K. S. Rao
Multi Channel Analysis Of Surface Wave (Masw) Testing For Dynamic Site Characterization Of Delhi Region, D. Neelima Satyam, K. S. Rao
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
After the Bhuj earthquake the national capital region of Delhi attracted major attention of several scientific studies in the recent times. Since Delhi falls in zone IV (IS 1893: 2002) with high seismic activity, there is a great need for site characterization and seismic hazard mapping of the area. Multi Channel Analysis of Surface Wave (MASW) tests were done in Delhi at 118 sites in predefined grids of 2kmX3km each. Shear-wave velocity, VS, is an important parameter for evaluating dynamic behavior of soil. This test carried outdone using 48 channel digital seismograph with 4.5 Hz geophones. Data was analyzed using …
Comparison Of Dynamic Soil Modelling Using Scpt, Sdmt And Sasw, Kayhan Aykin, Onder Akcakal, H. Turan Durgunoglu, Ozer Akbal
Comparison Of Dynamic Soil Modelling Using Scpt, Sdmt And Sasw, Kayhan Aykin, Onder Akcakal, H. Turan Durgunoglu, Ozer Akbal
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A site investigation campaign using cone penetration test (CPT), dilatometer test (DMT) are carried on alluvial deposits at a site located at Gemlik, Turkey towards the design of a newly planned hot reverse mill structure within the existing Borçelik steel factory. Site is located at the south of North Anatolian Fault that is sheared during 1999 Kocaeli Earthquake. In addition, the site is under the influence zone of another fault line going through the Gemlik Bay. Therefore, prediction of the behaviour of saturated alluvial deposits under a major expected design earthquake of the planned structures is the prime importance in …
Reproduction, By Means Of True Scale Testing, Of The Effects Caused On A Track By High Speed Railway Traffic, Javier Moreno Robles, Vicente Cuéllar Mirasol
Reproduction, By Means Of True Scale Testing, Of The Effects Caused On A Track By High Speed Railway Traffic, Javier Moreno Robles, Vicente Cuéllar Mirasol
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Nowadays, the social importance of the railway transportation is accepted without any doubt, and the levels of comfort and operation quality associated to railways are continuously increasing. The travel times that could be considered allowable in the past century are now obsolete and in order to reduce time “losses”, traffic speeds larger than 300 km/h are being asked for. In order to analyse properly the behaviour of the different layers that make up the railway track structure, the Centro de Estudios y Experimentación de Obras Públicas (CEDEX) of the Ministerio de Fomento, Spain, has built a large facility (5 x …
Correlation Between Low Strain Shear Modulus And Standard Penetration Test ‘N’ Values, P. Anbazhagan, T. G. Sitharam, P. Aditya
Correlation Between Low Strain Shear Modulus And Standard Penetration Test ‘N’ Values, P. Anbazhagan, T. G. Sitharam, P. Aditya
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this study an attempt has been made to develop correlation between standard penetration test (SPT) N values and low strain shear modulus (Gmax). The field experiments of Multichannel Analysis of Surface Wave (MASW) are carried out at 38 locations close to boreholes having Standard Penetration Test N values and in-situ density. These experimental data were generated and used for seismic microzonation of Bangalore, India. In-situ densities of subsurface layers were obtained from undisturbed soil samples collected from the boreholes. Shear wave velocity (Vs) profile with depth were obtained for the same locations or close to the boreholes …
Centrifuge Modeling Of The Influence Of Pre-Existing Fractures In Multilayered Soils On Ground Deformations, P. Hu, Y. H. Ding, Q. P. Cai, G. Y. Luo, C. W. W. Ng, Y. J. Hou
Centrifuge Modeling Of The Influence Of Pre-Existing Fractures In Multilayered Soils On Ground Deformations, P. Hu, Y. H. Ding, Q. P. Cai, G. Y. Luo, C. W. W. Ng, Y. J. Hou
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Fault rupture propagation in free fields lays the ground for an understanding of bedrock-soil-structure interactions. Propagation behaviors in dry soil have long been investigated. Localized shear bands have been identified to be the obvious source of failure in dry soils at depth. In addition, numerous subsurface fractures have been found in the field. However, the influence of subsurface fractures in the soil on future seismic faults has received little attention, especially in complex soils. In this study, three centrifuge tests were conducted to investigate the influence of pre-existing fractures on ground deformations in three multilayered soils: three-layered, five-layered and nine-layered …
Increasing Lateral Capacity Of Helical Piles With Lateral Restraint Devices, John L. Maier, Ali M. Oskoorouchi
Increasing Lateral Capacity Of Helical Piles With Lateral Restraint Devices, John L. Maier, Ali M. Oskoorouchi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Deflection analysis of piles under lateral live loads in various soil conditions is presented herein. Field testing of lateral capacity was conducted at four test sites in California and Nevada, where weak surface soil provides insufficient lateral capacity for helical piles. In these areas of weak surface soil, as defined by field or laboratory testing, the most feasible solution for a foundation system may be the implementation of a deep foundation system such as a pier and grade beam or helical pile (HP) foundation system. Helical pile diameters that normally range from 1-1/2 to 4 inches provide minimal support when …
P-Wave Reflection Imaging Of Laboratory Soil Models, Joseph Coe, Scott J. Brandenberg
P-Wave Reflection Imaging Of Laboratory Soil Models, Joseph Coe, Scott J. Brandenberg
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An ultrasonic p-wave reflection imaging system is used to non-invasively image submerged soil models with embedded anomalies and complex geometric layer contacts. The ultrasonic transducers emit compressive waves into water that subsequently transmit into the underlying soil, and measurements of the reflections are used to construct the images. Properties of the transducers and data acquisition hardware and software are explained. A soil model consisting of embedded high- and low-impedance anomalies, dipping soil layer contacts, and an undulating concrete base layer was imaged using 500 kHz transducers. The geometric features of the model are clearly visible in the images.
Passive Earth Pressure Force-Displacement Relationships, Patrick Wilson, Ahmed Elgamal
Passive Earth Pressure Force-Displacement Relationships, Patrick Wilson, Ahmed Elgamal
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
During a strong earthquake, passive earth pressure can provide resistance to excessive displacements along bridge abutments and pile caps. To account for this contribution, the force-displacement relationship is required, in addition to the peak resistance value. Experiments were performed at the University of California, San Diego to record the passive earth pressure force-displacement relationship behind a 1.7 meter tall vertical wall section. The experimental configuration of the soil container and wall system is described first. Backfill consisting of dense well-graded silty sand was placed in the soil container which measured 5.6 meters long, 2.9 meters wide and 2.15 meters deep. …
Experiences In Pumice Soil Characterization By Surface Wave Analysis, Salvador Lazcano
Experiences In Pumice Soil Characterization By Surface Wave Analysis, Salvador Lazcano
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Guadalajara, México, is a large city located mainly over a thick deposit (up 100 m) of pumice, in a seismic zone. Then, besides the stiffness of pumice soils, it is important to predict their behavior under seismic movements. Pumice soils are so crushable that SPT or CPT does not adequately characterize them. As a complement or alternative to SPT, CPT and other field testing, in recent years there has been a gradual increment in the use of surface wave analysis for soil characterization, by measuring shear wave velocity (VS). ReMi is one of the surface wave analysis methods …
Field Measurement Of Dynamic Soil Properties Of Tropical Meta-Sediment Residual Soils, Zamri Chik, Susy K. Ariestianty, Sri Atmaja P. Rosyidi, Khairul Anuar Mohd. Nayan, Mohd. Raihan Taha
Field Measurement Of Dynamic Soil Properties Of Tropical Meta-Sediment Residual Soils, Zamri Chik, Susy K. Ariestianty, Sri Atmaja P. Rosyidi, Khairul Anuar Mohd. Nayan, Mohd. Raihan Taha
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The study area which was located in Peninsular Malaysia comprised of residual meta-sedimentary soil derived Kenny Hill Formation. The dynamic soil properties of tropical meta-sediment residual soils were measured using non-destructive seismic method known as Multi-channel Analysis of Surface Wave (MASW) method. Twenty four geophones were located on ground in order to measure surface wave propagation. By inversion of dispersion curve, the shear wave velocity profile could be calculated and obtained. For most site investigations, other conventional method of field testing had been conducted such as drilling and Standard Penetration Test (SPT). This paper, however, attempts to obtain the comprehensively …
Innovative Triaxial/Resonant Column Equipment, Diego Carlo Federico Lo Presti, Nunziante Squeglia, Oronzo Pallara
Innovative Triaxial/Resonant Column Equipment, Diego Carlo Federico Lo Presti, Nunziante Squeglia, Oronzo Pallara
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The present paper describes a new triaxial apparatus which allows the measurement of low strain stiffness by means of both bender elements and resonant column test. In a previous paper Squeglia et al. (2009) described the innovative use of bender elements as receivers for the measurement of shear wave velocity. The proposed technique is synthetically described with the further development of apparatus which allow to perform resonant column test during a triaxial test. Since the apparatus has not been designed as a resonant column device, some critical points have been dealt with. Some tests have been dedicated to solve the …
Review Of Available Methods For Evaluation Of Soil Sensitivity For Seismic Design, Osama Abuhajar, M. Hesham El Naggar, Tim Newson
Review Of Available Methods For Evaluation Of Soil Sensitivity For Seismic Design, Osama Abuhajar, M. Hesham El Naggar, Tim Newson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Sensitivity describes the effect of soil disturbance/remoulding on shear strength. Cyclic stresses during seismic events may lead to varying levels of disturbance and remoulding of brittle sensitive clays. The Canadian Foundation Engineering Manual (CFEM) recommends site-specific evaluation of the seismic hazard, including site response analysis, for sites that have quick or highly sensitive clays. Different levels of soil sensitivity have been shown in different versions of CFEM and their errata. The current manual CFEM (2006) classifies clay as highly sensitive if its sensitivity is greater than 40 (classified as Class F soil). However, there is considerable variation within the literature …
Observations And Analysis Of Ground Motion And Pore Pressure At The Nees Instrumented Geotechnical Field Sites, Jamison H. Steidl, Sandra H. Seale
Observations And Analysis Of Ground Motion And Pore Pressure At The Nees Instrumented Geotechnical Field Sites, Jamison H. Steidl, Sandra H. Seale
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Garner Valley and Wildlife sites are producing a large data set that includes very interesting observations from earthquakes in the magnitude 4 to 7 range, with peak accelerations of ~10%g, at the threshold where nonlinear effects start to become important. In addition, hundreds of smaller earthquakes are recorded each month that provide the control data representing the linear behavior of the site. With the larger motions, we begin to see pore pressure build up on the liquefaction array at both the NEES Garner Valley Array site and at the NEES Wildlife Liquefaction Array site. We present the results of …
New Methods To Remove Arsenic From Soils, R. N. Khare
New Methods To Remove Arsenic From Soils, R. N. Khare
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In Chhattisgarh State, arsenic content in soil is usually moderate to high. However, on some industrial sites like in Bhilai Steel Plant Bhilai, certain effluent discharges can lead to high concentrations of this chemical in the soil. After periods of rainfall and runoff, arsenic can also be found in water. In this context, Indian researchers investigated the potential of contaminations to remove arsenic from contaminated soils and waters. In addition, Electrokinetic model is developed in laboratory which has shown that, depending on soil conditions, these models are able to remove heavy metals in polluted soils by 85-90%. Overall, this research …
Coupled Cwt Spectrogram Analysis And Filtration: New Approach For Surface Wave Analysis (A Case Study On Soft Clay Site), Sri Atmaja P. Rosyidi, Mohd. Raihan Taha, Zamri Chik
Coupled Cwt Spectrogram Analysis And Filtration: New Approach For Surface Wave Analysis (A Case Study On Soft Clay Site), Sri Atmaja P. Rosyidi, Mohd. Raihan Taha, Zamri Chik
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Surface wave analysis consists of generation, measurement and processing of the dispersive Rayleigh waves recorded from two or more vertical transducers. However, in case of soft clay soil, the reliable dispersion curve is difficult to be produced particularly at the frequency below 20 Hz. Some noises from nature and other human-made sources may disturb the generated surface wave data. In this paper, coupled analysis of continuous wavelet transform (CWT) spectrogram analysis based on Gaussian Derivative function was used to analyze the seismic waves in different frequency and time. First analysis is time-frequency wavelet spectrogram which was employed to localize the …
Ground Improvement Under Dynamic Loading, M. Ittershagen
Ground Improvement Under Dynamic Loading, M. Ittershagen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
To analyze the dynamic soil-structure interaction of railway lines on soft soil experimental and numerical investigations have been carried out. The mean intention was to get information about the influence of different soil improvement layouts and further on to establish a design tool for railway lines on soft soil based on the additional results of a numerically supported parametric study. The principle part of the paper is the presentation of the experimental and numerical investigations.
Near Field Wave Transformation In Clay And Peat, Stefan Van Baars
Near Field Wave Transformation In Clay And Peat, Stefan Van Baars
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A series of simple impact tests is performed, both on clay and on peat, in order to compare the current wave theory with the obtained data. The waves at the surface are measured with three 3D geophones. With this the wave propagation and the energy dissipation in three directions has been studied both for clay and peat. Since the impact produces a group of waves, only the first arrival time can easily be detected. By transferring the wave information into a 3D energy flow, also the average arrival time and the end-of-wave arrival time can be determined. The results of …
Investigation Of Shear Strain Amplitude Induced By Railroad Traffic In Soils, Dirk Wegener, Ivo Herle
Investigation Of Shear Strain Amplitude Induced By Railroad Traffic In Soils, Dirk Wegener, Ivo Herle
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Shear strain amplitude γ is an important quantity in dynamic soil analysis. Usually, a reduction of soil stiffness with increasing shear strain amplitude is observed in laboratory tests. An appropriate invariant of shear strain can be defined which is comparable with shear strains measured in laboratory tests. Usually, shear wave velocity cs is determined from field or laboratory tests and the particle velocity v is obtained from vibration measurements. Afterwards, the shear strain amplitude γ is often estimated from the equation γ = ν / cs, which can be derived for the case of one dimensional wave propagation. …
Propagation Of Surface Waves In An Irregular Ground Based On The Thin Layered Element And Finite Element Method, Hiroto Nakagawa, Shoichi Nakai
Propagation Of Surface Waves In An Irregular Ground Based On The Thin Layered Element And Finite Element Method, Hiroto Nakagawa, Shoichi Nakai
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The problem of wave propagation in an irregular ground is crucial when the landform is complex as in the case of Japan. This problem has been studied by a number of researchers; however, most of studies were made from the viewpoint of body wave propagation and only a few dealt with surface waves. The objective of this study is to examine Rayleigh and Love wave propagation in an irregular ground based on the combined method of thin layered element and finite element. In this paper, the following conclusions are made: 1. H/V spectra of a horizontally layered medium as well …
Stress- And Strain-Controlled Undrained Cyclic Triaxial Tests On A Fine Sand For A High-Cycle Accumulation Model, Torsten Wichtmann, Benjamin Rojas, Andrzej Niemunis, Theodor Triantafyllidis
Stress- And Strain-Controlled Undrained Cyclic Triaxial Tests On A Fine Sand For A High-Cycle Accumulation Model, Torsten Wichtmann, Benjamin Rojas, Andrzej Niemunis, Theodor Triantafyllidis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper presents a discussion of the isotropic elastic stiffness E in the high-cycle accumulation (HCA) model proposed by Niemunis et al. (2005). The model may be used to predict permanent deformations or excess pore water pressures in non-cohesive soils due to cyclic loading. The stress-dependent bulk modulus K was determined from pairs of drained and undrained cyclic triaxial tests on a fine sand with constant stress amplitude and with similar initial conditions. K was found in good agreement with an earlier study on a medium coarse sand where a correction for membrane penetration effects had to be applied. Undrained …