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International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
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Disclaimer, Multiple Authors
Disclaimer, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Preface, Shamsher Prakash
Preface, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Proceedings, Shamsher Prakash
Proceedings, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
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.
Committees, Multiple Members
Committees, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Conference Schedule, Multiple Authors
Conference Schedule, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Welcoming Remarks, Shamsher Prakash
Welcoming Remarks, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Conference Photos, Multiple People
Conference Photos, Multiple People
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
List Of Participants, Multiple Participants
List Of Participants, Multiple Participants
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Concluding Session, Shamsher Prakash
Concluding Session, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Organizing Committee Meeting: Agenda And Minutes, Multiple People
Organizing Committee Meeting: Agenda And Minutes, Multiple People
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Dynamic Geotechnical Comparative Testing Capability, W. Henke, R. Henke
Dynamic Geotechnical Comparative Testing Capability, W. Henke, R. Henke
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A concept and preliminary design are presented for a special testing capability to be added to an existing large laboratory geotechnical testing chamber. The modified chamber is intended to allow, through comparative testing, the reasonably rigorous evaluation of methods for providing detailed information, for soil deposits, on in situ undegraded nonlinear inelastic shear stress vs strain characteristics needed for dynamic geotechnical earthquake engineering analyses. Basically, the added capability is to be a large resonant column-like torsional testing system that tests the entire chamber sample and allows access to the center of the sample for the testing of the method to …
Dynamic Shear Modulus And Damping Ratio Predicted By A Unified 3-D Critical State Bounding Surface Plasticity Model, John P. Wolf, Roger S. Crouch
Dynamic Shear Modulus And Damping Ratio Predicted By A Unified 3-D Critical State Bounding Surface Plasticity Model, John P. Wolf, Roger S. Crouch
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A unified 3-d critical state bounding surface plasticity model (gUTS) has been developed which is able to provide realistic simulations of the behavior of clays, silts and sands both in drained and undrained conditions over a wide range of monotonic and complex cyclic paths. A strong feature of this model is its ability to treat loose and dense states of the same material with a single set of material constants. The link between the two states is made by introducing an apparent normal consolidation line for sands and adopting a volumetric plastic strain hardening/softening model (similar to the critical state …
Three-Dimensional Cyclic Behaviour Of Interfaces, E. Evgin, K. Fakharian
Three-Dimensional Cyclic Behaviour Of Interfaces, E. Evgin, K. Fakharian
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new apparatus is used to study the behavior of an interface between dry sand and a rough surface under three dimensional cyclic loading conditions. A simple shear type of soil container is utilized in the experiments to investigate the coupling effects of two orthogonal shear stresses acting on the interface. The significance of the results are discussed with reference to the behavior of axially-laterally loaded piles.
Simple Shear Versus Direct Shear Tests On Interfaces During Cyclic Loading, K. Fakharian, E. Evgin
Simple Shear Versus Direct Shear Tests On Interfaces During Cyclic Loading, K. Fakharian, E. Evgin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An apparatus capable of direct shear type and simple shear type testing of interfaces between soil and structural materials is developed. A series of monotonic and cyclic tests are conducted at the interfaces between dry sand and a rough surface under constant normal stress conditions with both methods. The test results indicate that the peak and residual shear strengths obtained from direct shear and simple shear are approximately the same. However, the simple shear box permits separate measurements of shear deformation of the sand mass and also sliding at the contact surface.
High Pressure Cyclic Triaxial Tests, Jianren Wang, Clay E. Sams, John D. Lawrence, Harry Johnson
High Pressure Cyclic Triaxial Tests, Jianren Wang, Clay E. Sams, John D. Lawrence, Harry Johnson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Shear modulus and damping from high pressure (up to 500 psi) cyclic triaxial tests of soils are presented. The test results are compared with published models where low confining pressures were used. The apparatus and test setup for the high pressure tests are also discussed.
Dynamic Characteristics Of Comares Palace In The Alhambra, V. Cuellar, E. Kausel, J. L. Monte, J. M. Roesset, J. Valerio
Dynamic Characteristics Of Comares Palace In The Alhambra, V. Cuellar, E. Kausel, J. L. Monte, J. M. Roesset, J. Valerio
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes the geotechnical investigations that have been conducted to characterize the static and dynamic properties of the ground, the foundation and the structure's material of the Comares tower in the Alhambra palace. The Gmax values of the different materials were determined using seismic refraction, P-wave transmission tomography, cross-hole and down-hole tests. To obtain the variation of the shear moduli with strain amplitude surface wave and cyclic horizontal plate loading tests were performed in several trenches excavated in the immediate neighborhood. The analysis of the structure response to M = 5 earthquakes recently recorded at the top and …
Study On Cyclic Shear Strength Of Soils From Different Methods, Chi-Tso Chang, Jin-Hung Hwang
Study On Cyclic Shear Strength Of Soils From Different Methods, Chi-Tso Chang, Jin-Hung Hwang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper compares the cyclic strengths of soils from different methods using intensive investigations at a recent alluvial site on the southwest Taiwan. Generally speaking, the cyclic shear strengths deduced from different methods exhibit the following trend: Block sample > Tube sample ↔ SPT -N (Standard Penetration Test) method > seismic Vs method > CPT-qc (Cone Penetration Test) method.
High Strain Rate Testing Of Unsaturated Sands Using A Split-Hopkinson Pressure Bar, G. E. Veyera, C. A. Ross
High Strain Rate Testing Of Unsaturated Sands Using A Split-Hopkinson Pressure Bar, G. E. Veyera, C. A. Ross
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
High strain rate tests were conducted on specimens of three different sands at saturations varying from dry to 100% using a Split-Hopkinson Pressure Bar. Compacted specimens were subjected to undrained uniaxial confined compression at approximate strain rates of 1000/s and 2000/s by an approximate square wave input of 225 MPa with a pulse length of 250 µs. The stress-strain curves show an initially steep portion which appears to be strain rate independent. Beyond this, slopes are about the same up to the lock-up strain, an abrupt change in slope, indicating an increase in stiffness. The effect of increasing saturation is …
Soil Damping And Its Use In Dynamic Analyses, A. K. Ashmawy, R. Salgado, S. Guha, V. P. Drnevich
Soil Damping And Its Use In Dynamic Analyses, A. K. Ashmawy, R. Salgado, S. Guha, V. P. Drnevich
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Soil response under dynamic loading has been modeled using linear-viscoelasticity for many decades. The definitions of various damping-related quantities are reviewed and the implications of their use in the analysis of continuous masses are given. The selection of an equivalent damping ratio as a parameter for modeling damping in most geotechnical applications is discussed together with the assumptions underlying the selection procedure. The techniques for damping determination using laboratory testing are summarized, emphasizing the influence that factors such as apparatus type, loading path, rate of loading, and strain level have on the measurement. Disturbance effects in samples recovered from the …
Modelling Of Cyclic Behavior Of Sand In Large Range Of Strain Amplitudes, P. Y. Hicher, M. Kordjani
Modelling Of Cyclic Behavior Of Sand In Large Range Of Strain Amplitudes, P. Y. Hicher, M. Kordjani
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The aim of this paper is to show that it is possible to model the behavior of soils in a large range of strains (10-6 to 10-1), using an elastoplastic law with a unique set of parameters. A multimechanism law with a kinematic hardening was used to model the monotonous and cyclic behavior of sand.
Total Stress Change During Cyclic Loading Under KO Conditions, Jian-Min Zhang, Shamoto Yasuhiro
Total Stress Change During Cyclic Loading Under KO Conditions, Jian-Min Zhang, Shamoto Yasuhiro
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Cyclic torsional and triaxial tests of saturated sand under Ko conditions were conducted in order to examine the change of total lateral stress in the following cases: during the build-up of excess pore water pressure under undrained cyclic shear, and during the one-dimensional compression, expansion and recompression due to dissipation and redistribution of excess pore water pressure following undrained cyclic shear. As a result, a simplified method is proposed to estimate the changes of the total and effective lateral stresses in saturated sand with changing excess pore water pressure after undrained cyclic loading in Ko conditions.
Cyclic Testing Of Aggregates For Pavement Design, M. M. Zaman, Dar-Hao Chen, J. G. Laguros
Cyclic Testing Of Aggregates For Pavement Design, M. M. Zaman, Dar-Hao Chen, J. G. Laguros
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Two most commonly encountered aggregates that are used as subbases/bases of roadways in Oklahoma were selected and tested under cyclic loading to evaluate their Resilient Modulus (RM). Following the repeated triaxial RM testing, the specimens were subjected to the triaxial compression tests from which the parameters of cohesion (C), and friction angle (Φ) were obtained. A good statistical correlation was established between RM and C and Φ. The repeated triaxial RM testing procedure serves as a “conditioning” prior to the static triaxial compression and it simulates the loads imposed by the moving vehicle. The effects of conditioning on C and …
Nonlinear Cyclic Stress-Strain Relations Of Soils, K. Nakagawa, K. Soga
Nonlinear Cyclic Stress-Strain Relations Of Soils, K. Nakagawa, K. Soga
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A cyclic torsional shear testing system was developed to measure the dynamic properties of soils at a wide range of strain levels (10-4 ~ 1%). Use of proximity transducer and pneumatic actuator in a closed loop system enabled us to measure the deformation at very small strains. A new simple nonlinear model of G/Gmax = 1/(α+γβ) agreed well with the test results of various geologic materials. In this model, parameter a represents the strain at which the stiffness starts to decrease, and parameter α controls the rate of the stiffness degradation. Loose sands had larger α …
Subsequent Consolidation Of Clay Subjected To Undrained Cyclic Loading, Tej B. S. Pradhan, G. Imai, Y. Ueno, T. K. Dam
Subsequent Consolidation Of Clay Subjected To Undrained Cyclic Loading, Tej B. S. Pradhan, G. Imai, Y. Ueno, T. K. Dam
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper is mainly focused on two parts: (a) to clarify the mechanism of migration of excess pore water pressure in clay specimen and (b) subsequent consolidation behavior after the dissipation of excess pore water pressure accumulated due to undrained cyclic loading. A new technique to measure the pore pressure at the mid-height periphery of a triaxial specimen was developed. The effect of loading frequency and the stress level on the generation of excess pore pressure at the top, bottom and at mid-height of the specimen has been discussed. The variation of recompression index due to the dissipation of excess …
Random Displacement Modulus And Damping Determination, R. C. Chaney
Random Displacement Modulus And Damping Determination, R. C. Chaney
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Modulus and damping values were determined for both undisturbed and remolded silty sand specimens by cyclic triaxial methods utilizing both sinusoidal and random displacement stroke control. Remolded specimens were prepared at 3 different dry unit weights using a preparation technique that gave the same formation factor as the undisturbed specimen. Results indicated that the random displacement method tends to produce results which are similar to those obtained by the sinusoidal procedure at shearing strain levels less than 10-1 %. At shearing strain levels greater than 10-1 % the random displacement method gives lower modulus and higher damping ratio …
Stress Dependence Of Sand Stiffness, D. C. F. Lo Presti, M. Jamiolkowski, O. Pallara, V. Pisciotta, S. Ture
Stress Dependence Of Sand Stiffness, D. C. F. Lo Presti, M. Jamiolkowski, O. Pallara, V. Pisciotta, S. Ture
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The stress dependence of the Young's modulus of two sands was studied with a computer controlled triaxial apparatus, capable of giving reliable measurements of the stiffness even at very small strains ≈ 0.001 %. It was therefore possible to determine the Young's modulus of the sands for a wide strain range, from very small to very large, up to 20 %. The tested sands were: a uniform fine quartz sand not containing fines (Toyoura sand- TOS), and a well graded coarse to medium carbonatic, crushable sand containing about 2% of fines (Quiou sand - QS). The specimens were reconstituted in …
A New Method For Determining The Anisotropic Parameters Of Materials Under True Triaxial Cyclic Loading, Q. J. Yang, B. Shackel
A New Method For Determining The Anisotropic Parameters Of Materials Under True Triaxial Cyclic Loading, Q. J. Yang, B. Shackel
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper a new approach to solving the basic equations of elastic cross-anisotropic stress and strain relationships is presented. The uniqueness of the equations is demonstrated and the conditions for their use are easily controlled in the true triaxial test equipment available in the laboratory. By this approximate solution the four anisotropic parameters of cross-anisotropic materials can be obtained. In addition, so-called fuzzy logic weighting factors are introduced to assess the differences among the observed principal deformations of samples tested. A computer program ANISOLV has been written to calculate the formulated parameters. Some typical examples are given to demonstrate …
Preshearing Effect On Effective Stress Paths, Q. J. Yang
Preshearing Effect On Effective Stress Paths, Q. J. Yang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a brief summary of the triaxial single and multi-level loading test technique to model the soils experiencing wind and/or wave kinds of load. Some important findings regarding the shear strength and pore pressure phenomenon in the repeated triaxial experiments are given. The method describing the stress path under single- and multi-level repeated stresses is established in detail. Based on a large number of the test results, some typical stress paths are presented m the effective deviation and normal stress space. The stress paths under single repeated stress at different effective ambient pressures have the same pattern and …
Evaluation Of Bender Elements For Use With Coarse-Grained Soils, S. Nazarian, S. S. Baig
Evaluation Of Bender Elements For Use With Coarse-Grained Soils, S. Nazarian, S. S. Baig
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The feasibility of using piezo-ceramic bender elements for measuring shear modulus of coarse materials has been reported. If was found that moduli obtained from bender element are repeatable. The results in most cases compare favorably with those obtained by resonant column.