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Full-Text Articles in Geotechnical Engineering
Preface, Shamsher Prakash
Preface, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Sessions, Multiple Authors
Sessions, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Organizing Committee, Multiple Members
Organizing Committee, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
A New Soil Model And Dynamic Soil Properties, Y. Gyoten, K. Mizuhata, T. Fukusumi, H. Hamada, T. Hirose
A New Soil Model And Dynamic Soil Properties, Y. Gyoten, K. Mizuhata, T. Fukusumi, H. Hamada, T. Hirose
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A series of cyclic triaxial loading tests with varying strain amplitude were performed on samples of clay and sand. Three types of polynomial functions and a hyperbolic function were applied to express the experimental nonlinear hysteresis curve of soils under cyclic loading conditions. These functions were used for the earthquake response analysis of the actual ground containing alluvial clay layer and of the idealized saturated sandy soil ground whose stiffness gradually decreases as the development of pore-water pressure. The results of the dynamic responses and the liquefaction potential were compared for a particular actual site and an idealized site by …
Creep Effects On Low-Amplitude Modulus Of Clays, G. A. Athanasopoulos, F. E. Richart Jr.
Creep Effects On Low-Amplitude Modulus Of Clays, G. A. Athanasopoulos, F. E. Richart Jr.
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The investigation considered effects of on-going or previous drained creep on the low amplitude dynamic shear modulus of normally consolidated artificial and natural clay soils. Resonant column tests using the Hardin and Hall devices determined the low-amplitude shear modulus. Results indicated that the strain-rate of on-going creep determined the kind of effect on shear modulus. High strain-rates produced reduced values whereas low strain-rates slightly increased values of modulus, compared to the no-creep values. Previous creep produced higher values of modulus, when the clay was tested under after-creep isotropic confinement. The rate of secondary increase of shear modulus was not affected …
The Shear Modulus And Deformation Of Soils Under Cyclic Loading, Ting Hu
The Shear Modulus And Deformation Of Soils Under Cyclic Loading, Ting Hu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper the dynamic deformation stages of soils under cyclic loading and the major factors affecting the shear modulus of soils are analyzed. The in-situ measurement of surface wave by larger energy source to obtain the shear modulus of the ground is described. On considering the important effect of shearing dilatancy on shear modulus of sandy soils, a modified formula is proposed. For typical soils, the axial strains under cyclic loading are determined either for estimating shear modulus or for the deformation analysis in design.
In-Situ Measurements Of Blast Seismic Waves And Their Safety Distance, Rui-Geng Zhu, Li Zhen
In-Situ Measurements Of Blast Seismic Waves And Their Safety Distance, Rui-Geng Zhu, Li Zhen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Empirical formulae and their applications are given after systematically analysing the seismic wave data as measured in various blasting operations. The computed results are ln close agreement with the field measured data
In Situ Measurement On Dynamic Modulus And Damping Of Pleistocene Soils, H. Mori, H. Tsuchiya
In Situ Measurement On Dynamic Modulus And Damping Of Pleistocene Soils, H. Mori, H. Tsuchiya
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper presents the results of measurement on the dynamic modulus of deformation and damping ratio of dense sand or stiff clay of the Pleistocene epoch using a dynamic pressuremeter. The paper first describes an outline of an instrument and procedures of the dynamic pressuremeter test, which include necessary correction of data for eliminating the influence of compressibility and damping of the instrument. From the results of field measurement, the moduli derived from the dynamic pressuremeter tests were found several times greater than those from laboratory tests which were affected by disturbance of soil samples.
Dynamic Triaxial And Vibratory In-Situ Behavior Of Cohesive Soil, M. S. Ei-Hosri, J. Biarez, P. Y. Hicher
Dynamic Triaxial And Vibratory In-Situ Behavior Of Cohesive Soil, M. S. Ei-Hosri, J. Biarez, P. Y. Hicher
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In-situ and laboratory shear modulus data are presented and compared. In-situ tests included the cross-hole seismic survey at a stiff marl site, while laboratory tests included the cyclic triaxial test on undisturbed specimens obtained from the same site. The cyclic triaxial device presented in this investigation has been developed and improved so that the reliable response of soil can be measured directly from the specimen over a large range of strain (from 10-6 to 10-2 ). A series of cyclic triaxial tests were performed under stress controlled condition over a range of frequency from 0,5 to 10 Hz …
Dynamic Behavior Of Soils From Field And Laboratory Tests, W. P. Grant, F. R. Brown Jr.
Dynamic Behavior Of Soils From Field And Laboratory Tests, W. P. Grant, F. R. Brown Jr.
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Both geophysical and laboratory tests were used to determine the dynamic shear moduli of medium stiff to hard clays and silts at six sites. The geophysical measurements included conventional downhole tests conducted at low strain levels and modified cross-hole impulse tests conducted over a wide range of strains. Laboratory resonant column and cyclic triaxial tests were performed on soil samples retrieved from borings made at the sites. The results from both the field and laboratory tests of the medium stiff to stiff sols showed fairly good agreement. The laboratory test results of the hard clays and silts, however, were typically …
Soil Model Of Effective Stress For Seismic Loadings, Wang Zhiliang, Wang Yuqing
Soil Model Of Effective Stress For Seismic Loadings, Wang Zhiliang, Wang Yuqing
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Generalized Masing Curve, recently proposed, has been improved in this paper to involve the effect of pore pressure on shear modulus and damping ratio. Fraction cycle method for pore pressure generation can be adopted to avoid the iterative computation, which is necessary in equivalent cycle method.
Monitoring Rock Blasting For Tunnel Construction, P. Deó, D. L. Hanson, K. R. Hindo
Monitoring Rock Blasting For Tunnel Construction, P. Deó, D. L. Hanson, K. R. Hindo
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A program for the monitoring of rock blasting operations for the construction of a sewer tunnel has been discussed. A summary of observations together with pertinent conclusions and recommendations regarding the blasting operations, the potential for damage to nearby structures and criteria for safe blasting operations has been presented. It is recommended that peak particle velocity be restricted to two inches per second in horizontal direction at the nearest existing structure to prevent cracking of walls.
Cyclic Simple Shear Of Large Scale Sand Samples: Effects Of Diameter To Height Ratio, W. D. Kovacs, E. Leo
Cyclic Simple Shear Of Large Scale Sand Samples: Effects Of Diameter To Height Ratio, W. D. Kovacs, E. Leo
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Cyclic drained simple shear tests on a dry sand using a 12 in diameter sample with sample heights of 1, 2, and 4 in show the effect of Diameter/Height ratio on the shear modulus and percent of critical hysteretic damping at various shear strain levels. The shear modulus is found to increase with cycle number and with increasing specimen size. The D/H ratio is found to affect the shear modulus at low shear strains (< 1 percent) and found to have little effect at higher shear strains and at failure. The hysteretic damping decreases for all values of shear strain tested (0.01 to 1 percent) as the cycle number and D/H ratio increases. Possible implications on design and pore pressure development are mentioned.
Session 1a: Opening Remarks And Moderator's Report, F. E. Richart Jr., Richard D. Woods
Session 1a: Opening Remarks And Moderator's Report, F. E. Richart Jr., Richard D. Woods
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Session 1: Discussions And Replies, Multiple Authors
Session 1: Discussions And Replies, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Cyclic Strength Of Undisturbed Mine Tailings, Kenji Ishihara, Susumu Yasuda, Koichiro Yokota
Cyclic Strength Of Undisturbed Mine Tailings, Kenji Ishihara, Susumu Yasuda, Koichiro Yokota
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In order to update existing regulations for the seismic design of tailings retention dikes, extensive investigations were undertaken for 15 existing tailings dams throughout Japan. Undisturbed samples procured from the tailings disposal ponds were tested ln the laboratory to determine the cyclic strength of the in-situ tailings deposits. The results of cyclic triaxial tests on these materials are summarized by means of empirical formulae which are recommended for incorporation in the new seismic design code for the tailings dams.
Pore Pressure In Silty Sand Under Cyclic Shear, R. L. Wei, T. L. Guo, Y. M. Zuo
Pore Pressure In Silty Sand Under Cyclic Shear, R. L. Wei, T. L. Guo, Y. M. Zuo
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In order to study the liquefaction phenomena of silty sand, saturated specimens prepared in the laboratory according to the dry unit weight of undisturbed samples are used to examine the cyclic shear resistance, pore pressure and residual shear strain developed in these specimens under cyclic loading. These tests are accomplished with a cyclic simple shear test apparatus developed in Nanjing Hydraulic Research Institute. Based on results of these tests expressions of cyclic shear resistance, pore pressure, dynamic shear modulus and residual shear strain as functions of number of cycles, consolidation pressure, initial and cyclic shear stress etc. have been developed.
Mechanical Behavior Of Cohesive Soil Under Repeated Loading, K. Akai, Y. Ohnishi, Y. Yamanaka, K. Nakagawa
Mechanical Behavior Of Cohesive Soil Under Repeated Loading, K. Akai, Y. Ohnishi, Y. Yamanaka, K. Nakagawa
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new triaxial apparatus which can control the stress condition automatically in a constant mean principal stress under repeated loading was developed, Mechanical behavior of cohesive soils under repeated loading was investigated. Excess pore water pressure generated in loading cycles was measured and the experimental results were interpreted in terms of effective stress by using elasto-plastic models.
Estimation Of In-Situ Clay Strengths Using Marine Sediment Penetrators, R. L. Mcneill, A. D. Foster
Estimation Of In-Situ Clay Strengths Using Marine Sediment Penetrators, R. L. Mcneill, A. D. Foster
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A method has been developed to calculate soil shear strengths from the measured decelerations of a free-fall penetrator. The method is easy to apply, and appears to yield accurate estimates of in-situ soil strength over a wide variety of soil conditions, and for many different sizes and weights of penetrators. For gassy and/or sensitive soils, the method may yield strength values more accurate than those determined by conventional boring, sampling, and laboratory testing.
In-Situ Measurements Of Pore Pressures, R. L. Mcneill, E. W. Reece
In-Situ Measurements Of Pore Pressures, R. L. Mcneill, E. W. Reece
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
As engineering moves into deeper waters, measurements of soil properties in the laboratory may be highly suspect if the soils are gassy. Strength and pore-pressure data are presented and discussed. A suggestion is made for development of pore-pressure gauges to detect the presence of clathrates.
Mechanical Behavior Of Granite Under Cyclic Compression, V. Rajaram
Mechanical Behavior Of Granite Under Cyclic Compression, V. Rajaram
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A better understanding of soil/rock-structure interaction is invaluable in the seismic design of concrete and masonry structures. In an effort to understand the behavior of rock under cyclic compression, both intact and faulted specimens of Westerly granite (2.5 cm. dia. x 6.25 cm. long) were subjected to uniaxial and triaxial loading at a uniform rate of one cycle per second. The fatigue strength under uniaxial loading at 106 cycles was found to be about 70% of the static compressive strength, and confining pressure improved fatigue resistance considerably. The accumulated permanent strain at the maximum stress level was found to …
Nonlinear Soil Properties Estimated From Strong Motion Accelerograms, K. Tokimatsu, S. Midorikawa
Nonlinear Soil Properties Estimated From Strong Motion Accelerograms, K. Tokimatsu, S. Midorikawa
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A rational procedure is developed for estimating dynamic soil properties from strong motion accelerograms obtained only at the ground surface. The method consisting of spectrum analysis and multi-reflection analysis could permit evaluation of time histories of shear modulus versus shear strain in the soil during an earthquake. The method is applied to four sites where the soil profile is relatively simple and where several strong motion records are available. The analytical results show that (1) the first predominant period of surface soil increases with an increase in shear strain developed in the soil, (2) the strain-dependent shear moduli evaluated from …
Soil Behavior Under Dynamic Loadings, T. Goltom, G. Baladi
Soil Behavior Under Dynamic Loadings, T. Goltom, G. Baladi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Stress-controlled cyclic triaxial tests were performed on clay samples obtained from the subgrades of existing highway pavements in the State of Michigan. These samples were unconsolidated or isotropically consolidated and then tested under the following conditions: 1) confining pressures of 34.5 psi and 172.4 kPa (5 and 25 psi), 2) a range of stress ratio from 2 to 4, 3) a constant frequency of one cycle per second, and 4) at the natural water contents. Test equipment included an MTS electrohydraulic closed-1oop system which applies the sustained and cyclic loads to the sample in a stress-controlled mode, a minicomputer which …
Progressive Strain Of Sand Due To Cyclic Loading, D. H. Timmerman, S. Leelanitkul
Progressive Strain Of Sand Due To Cyclic Loading, D. H. Timmerman, S. Leelanitkul
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Progressive axial strain produced by cyclic, triaxial loading conditions was measured on Ottawa sand samples of various relative densities. The theoretical cyclic shearing strain amplitude in each sample was determined using a modified, hyperbolic shearing stress-shearing strain relationship. The data shows a linear log-log correlation between the measured progressive axial strain and the calculated cyclic shearing strain amplitude. The correlation is proposed as a general procedure for predicting progressive strains resulting from general cyclic, triaxial loading conditions.
Analysis Of Stress Distribution In Torsional Shear Testing, J. S. Denatale, C. K. Shen, L. R. Herrmann, J. L. Vrymoed
Analysis Of Stress Distribution In Torsional Shear Testing, J. S. Denatale, C. K. Shen, L. R. Herrmann, J. L. Vrymoed
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The research described herein is concerned with the establishment of a specimen geometry that will lead to a more uniform stress distribution in cyclic torsional shear testing. This goal is realized by means of a parametric study using the method of finite elements and a homogeneous, isotropic, linear-elastic soil characterization. The results of these analyses provide a good qualitative measure of the relative effects of the several parameters under consideration. On the basis of the parametric study, design charts are developed which enable an appropriate specimen geometry to be selected for any specified degree of stress uniformity.
Behavior Of Interfaces Between Structural And Geologic Media, C. S. Desai
Behavior Of Interfaces Between Structural And Geologic Media, C. S. Desai
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The main objective of this paper is to identify and discuss the subject of the effect of interface behavior on the overall soil-structure interaction in building foundation systems. A brief review of the previous approaches based on the assumption of compatibility between the structure and soil is followed by a discussion of the recent efforts toward inclusion of relative slip, debonding and rebonding at interfaces. Here available models in the context of the lumped parameter and finite element approaches are reviewed. A number of models used in static and dynamic analyses are presented, and the difficulties associated with those based …
Cyclic Loading On Clays, P. Y. Hicher, M. S. Elhosri
Cyclic Loading On Clays, P. Y. Hicher, M. S. Elhosri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Experimental results using triaxial undrained cyclic tests on remolded and non-remolded are exposed. The influence of the clay structure is shown by choosing four clays with different mineralogies (kaolinite, illite, bentonite, marl). Different over consolidation ratios are used and the fatigue phenomenon is studied in relation to the evolution of the effective stress path.
Analysis For Liquefaction: Empirical Approach, M. K. Yegian, B. M. Vitelli
Analysis For Liquefaction: Empirical Approach, M. K. Yegian, B. M. Vitelli
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An improved analytical method to calculate the likelihood of soil liquefaction is described. The method is based on an expanded list of case histories of liquefaction and no-liquefaction and employs earthquake magnitude and hypocentral distance to describe the intensity of shaking at a site. The new list of case histories is compiled from a complete re-evaluation of previously published case histories and field data observed in more recent earthquakes. Specific applications of the proposed procedure are described and an example analysis is presented.
Assessment Of Liquefaction Potential Based On Seismic Energy Dissipation, R. O. Davis, J. B. Berrill
Assessment Of Liquefaction Potential Based On Seismic Energy Dissipation, R. O. Davis, J. B. Berrill
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A simple relationship between dynamic pore pressure increase, earthquake magnitude, epicentral distance, initial effective overburden stress, and SPT value is proposed. The model is based on the concept that pore pressure increase depends upon the density of seismic energy dissipated at the site.
Field Correlation Of Soil Liquefaction With Spt And Grain Size, K. Tokimatsu, Y. Yoshimi
Field Correlation Of Soil Liquefaction With Spt And Grain Size, K. Tokimatsu, Y. Yoshimi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Two earthquakes of magnitudes 6.7 and 7.4 that occurred in 1978 off the Pacific coast of Miyagi Prefecture, Japan, provided field liquefaction data for a fairly wide range of peak ground surface acceleration from 100 to 290 gal. The range of SPT N-values was also fairly wide because special efforts were made to collect non-liquefaction data in addition to liquefaction data. Dynamic shear stress ratios adjusted for earthquake magnitudes and effective overburden pressures are plotted against N-values adjusted for effective overburden pressures. The field data are compared with two methods proposed recently, one by Seed and the other by Iwasaki …