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Articles 13771 - 13800 of 33681
Full-Text Articles in Entire DC Network
Keynote Lecture: Some Recent Developments In The Selection Of Ground Motions For Design, W. D. Liam Finn, A. Wightman
Keynote Lecture: Some Recent Developments In The Selection Of Ground Motions For Design, W. D. Liam Finn, A. Wightman
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes some recent developments in the selection of ground motions for design; the conditional mean spectrum approach and risk targeted ground motions. The conditional mean spectrum approach is just finding its way into practice and its application to a major dam is presented. Risk targeted ground motions are the basis for the next generation of building codes in the USA. The process of determining these motions is explained. Finally in the context of the retrofit of 800 schools in British Columbia, Canada, a performance based design procedure based on incremental dynamic analysis (IDA), with direct application to geotechnical …
Table Of Contents, Multiple Authors
Table Of Contents, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
A Practical Model For Advanced Nonlinear Analysis Of Earthquake Effects In Clay Slopes, Mahdi Taiebat, Amir M. Kaynia
A Practical Model For Advanced Nonlinear Analysis Of Earthquake Effects In Clay Slopes, Mahdi Taiebat, Amir M. Kaynia
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Presented in this paper is an effort in providing an advanced yet practical tool with a reasonable level of complexity for modeling of clays in realistic geotechnical engineering problems. SANICLAY model is a Simple ANIsotropic CLAY plasticity model that has been developed by Dafalias et al. (2006). The SANICLAY model provides successful simulation of both undrained and drained rateindependent behavior of normally consolidated clays, and to a satisfactory degree of accuracy of overconsolidated clays. An associated flow rule extension of the SANICLAY model has been employed in the present study, trading simplicity for some accuracy in simulations. The model requires …
An Evaluation Of Ground Vibrations Induced By Heavy Free-Falling Structural Elements, Kwangkyun Kim, Mark J. Carlson, Duhee Park
An Evaluation Of Ground Vibrations Induced By Heavy Free-Falling Structural Elements, Kwangkyun Kim, Mark J. Carlson, Duhee Park
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Ground vibrations generated during a large structural demolition event can be potentially damaging to nearby structures or sensitive equipment. In this paper, an approach for the prediction of the ground vibration induced by a large free-falling heavy weight is proposed based on both measured and collected data. A series of field ground vibration measurements were performed relative to the dynamic motions induced by free-falling heavy structural elements during demolition of a generating plant in the upper Midwest, USA. Using this information and the collected data, correlations between the measured PPV and normalized distance from the impact source with various ground …
Assessment Of Liquefaction/Cyclic Failure Potential Of Alluvial Deposits On The Eastern Coast Of Cyprus, Huriye Bilsel, Goknur Erhan, Turan Durgunoglu
Assessment Of Liquefaction/Cyclic Failure Potential Of Alluvial Deposits On The Eastern Coast Of Cyprus, Huriye Bilsel, Goknur Erhan, Turan Durgunoglu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The main objective of this paper is to evaluate liquefaction potential and cyclic failure of subsoils of Tuzla area located on the eastern coast of Cyprus. The in-situ tests of cone penetration test (CPT) and standard penetration test (SPT) were used for site specific evaluation of liquefaction potential. Index properties and undrained shear strength (su) were used to assess cyclic failure potential of fine-grained soils. Liquefaction potential index (LPI) was evaluated based on the calculated factor of safeties for each CPT location. Sensitivity of soils was indirectly estimated from liquidity index (LI). The samples tested displayed high sensitivity …
Cyclic Compression Of Compacted Clayey Sand At Small Cyclic Strains, Mladen Vucetic, Macan Doroudian, David W. Sykora
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 …
Cyclic Response Of Reconstituted Low Plasticity Silt, Selman Sağlam, B. Sadık Bakır
Cyclic Response Of Reconstituted Low Plasticity Silt, Selman Sağlam, B. Sadık Bakır
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Foundation failures observed over saturated silt-clay mixtures during past earthquakes clearly indicate the need for a profound understanding of the behavior of such soils under seismic loading. Although the mechanisms dominating the response of fine grained soils under seismic loading are known to be different from those of sandy soils, the behavior of low plasticity silt and clay is still under discussion. An experimental research program, still in progress, has been undertaken to investigate the cyclic behavior of low plasticity fine grained soils for developing useful guidelines for the assessment of seismic response. Samples of low plasticity silt, initially consolidated …
Constitutive Models Predicting The Response Of Clays Along Slip Surfaces, Constantine A. Stamatopoulos
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. …
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 …
Dynamic Site Characterization By The Seismic Dilatometer Marchetti Test In Central Italy, Antonio Cavallaro, Salvatore Grasso, Michele Maugeri
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 …
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 …
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 …
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 …
On The Influence Of The Grain Size Distribution Curve On Dynamic Properties Of Quartz Sand, Torsten Wichtmann, Theodor Triantafyllidis
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 …
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 …
Recovery Of Elastic Parameters For Cross-Anisotropic Sandy Soil Via Elastic Wave Measurements, Omer Faruk Capar, Isao Ishibashi
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 …
Resonant Frequency Of Model Footings Resting On Finite Saturated Sand Stratum, H. N. Ramesh, M. T. Prathap Kumar
Resonant Frequency Of Model Footings Resting On Finite Saturated Sand Stratum, H. N. Ramesh, M. T. Prathap Kumar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The resonant frequency of the foundation-soil system depends on several factors and nonhomogeniety of soil is one of the important factors that include the effect of saturation. In the present investigation, the effect of saturation and location of rigid concrete base on the resonant frequency of foundation-soil system was determined by conducting vertical vibration test on model footings resting on the surface of finite dry sand stratum as well as on finite saturated sand stratum underlain by rigid concrete base. On the basis of the experimental investigation, it was concluded that the presence of rigid base at shallow depth decreases …
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 …
Shearing Rate Effect On Mechanical Behavior Of Msw Materials, Nader Shariatmadari, Sandro Lemos Machado, Ali Noorzad, Mehran Karimpour Fard, Mohsen Keramati, Seyyed Hossein Jafari Kalarijani
Shearing Rate Effect On Mechanical Behavior Of Msw Materials, Nader Shariatmadari, Sandro Lemos Machado, Ali Noorzad, Mehran Karimpour Fard, Mohsen Keramati, Seyyed Hossein Jafari Kalarijani
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Recent catastrophic failure in different regions of the world is an indication on the poor level of engineering knowledge on the mechanical behavior of MSW materials which are the main materials in the landfill body. However extensive researches have been made to represent a clear frame work to describe the behavior of these materials but clearly all of these attempts had not been enough. In the region with high seismic activity, mechanical response of MSW materials under quick and dynamic loading condition is one of the issues which should be addressed however there are some evidences concerning the higher resistance …
Simplified Theoretical Analysis Of The Seismic Response Of Artificially Compacted Gravels, Giuseppe Modoni, Anna Gazzellone
Simplified Theoretical Analysis Of The Seismic Response Of Artificially Compacted Gravels, Giuseppe Modoni, Anna Gazzellone
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Despite extensive use of gravely materials for the construction of big earthworks, theoretical prediction of their seismic response is often based on very simple schemes, unable to reproduce most of the important features observed at sample scales. Theoretical models capable of simulating the effects of artificial compaction on the stress-strain response of these soils under complex static and dynamic loading conditions would be particularly useful for designing more cost effective solutions in the construction of large embankments. This paper is aimed to fill this gap by reporting the results of a simplified theoretical study on the seismic response of an …
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 …
Soil Improvement Techniques For Mitigation Of Seismic Hazards - An Overview, Ram Prasad Sharma
Soil Improvement Techniques For Mitigation Of Seismic Hazards - An Overview, Ram Prasad Sharma
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
If seismic hazards are deemed to be unacceptably high because of poor soil conditions, it is often possible to achieve improved seismic performance through the use of one or more soil improvement techniques. Poor performance is the result of inadequate strength, low stiffness, or insufficient drainage. Many improvement techniques have been evolved over the years, mostly through trial and error, aimed at improving at least one of these properties. When selecting one or more mitigation methods, it is important to consider the effectiveness of the improvement approach for the particular situation at hand, cost, environmental consequences, regulatory requirements, and technical …
The Effect Of Nonplastic Silt Gradation On The Liquefaction Behavior Of Sand, Mehmet Murat Monkul, Jerry A. Yamamuro
The Effect Of Nonplastic Silt Gradation On The Liquefaction Behavior Of Sand, Mehmet Murat Monkul, Jerry A. Yamamuro
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Various researchers have published results regarding the effect of non plastic silts on the liquefaction behavior of sands. Some concluded that increasing fines content decrease the liquefaction potential, whereas others observed the opposite. Some of those discrepancies might be explained via various factors such as different confining stresses, different depositional methods, different consolidation histories and possibly different comparison bases (i.e. void ratio, intergranular void ratio, relative density). New experimental results from monotonic undrained triaxial compression tests performed on Nevada Sand-A mixed with different silts indicate that liquefaction behavior is also significantly influenced by the gradation of the fines.
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 …
Threshold Shear Strain For Cyclic Degradation Of Three Clays, Kentaro Tabata, Mladen Vucetic
Threshold Shear Strain For Cyclic Degradation Of Three Clays, Kentaro Tabata, Mladen Vucetic
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Cyclic threshold shear strain, γt, is small cyclic shear strain amplitude above which soil properties significantly change with the number of cycles, N, and below which such changes are for all practical purposes negligible. To date, three cyclic threshold shear strains have been experimentally verified: for cyclic settlement (cyclic compression), for residual cyclic pore water pressure, and for cyclic stiffening. Subject of the paper is testing of fourth cyclic threshold shear strain for cyclic degradation, γtd. When fully saturated soil is subjected in undrained conditions to moderate or large cyclic strain-controlled loading, its secant shear modulus, …
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 …
Residual Strength Of Liquefied Sand: Laboratory Vs. Field Measurements, Julián Sandoval, Pedro De Alba, Thomas P. Ballestero, Barry K. Fussell
Residual Strength Of Liquefied Sand: Laboratory Vs. Field Measurements, Julián Sandoval, Pedro De Alba, Thomas P. Ballestero, Barry K. Fussell
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Determining the residual strength of liquefied sand is essential for estimating post-earthquake stability of vulnerable earth structures, or calculating runout of liquefaction flow slides. Current practice is to select values from a database of back-calculated residual strengths from failure case histories, which have been related to representative penetration test resistance numbers in the failed materials. Given the uncertainties involved, it is desirable to compare the field data with laboratory tests under controlled conditions. This paper describes residual strength measurements for a uniform fine sand using two recently-developed tests designed to impose large strains and strain rates: a modified triaxial test …
Field And Laboratory Tests In Seman Deposits, Luljeta Bozo, Skender Allkja, Lorena Harizaj
Field And Laboratory Tests In Seman Deposits, Luljeta Bozo, Skender Allkja, Lorena Harizaj
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The construction of the big energetic park near the spilling of the river needed a geotechnical study to be performed by thoroughly investigations of the sand’s deposits. We would like to present in these papers all the field investigations, laboratory tests and geotechnical study carried out by “ALTEA&GEOSTUDIO2000” laboratory in order to identify the behavior of soils under static and seismic loads. It is possible to create some geotechnical models based on this study and to determine their behavior under static and seismic conditions.
An Insight To The Effect Of Initial Static Shear Stress On The Liquefaction Of Sands, S. Mohsen Haeri, Mehdi Pouragha
An Insight To The Effect Of Initial Static Shear Stress On The Liquefaction Of Sands, S. Mohsen Haeri, Mehdi Pouragha
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The effect of initial static shear stress on cyclic behavior of sands has been the concern of many researchers for more than five decades. This study includes the results of a set of cyclic simple shear tests carried out on a uniform sand with relative densities of 20%, 40%, and 60%, under three different initial normal stresses of 50, 150, and 250 kPa. All tests were performed under constant volume condition. Results show that the behavior of sands due to initial static shear stress, is controlled by two contradictive elements: first one relates to the increasing dynamic shear modulus due …