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Full-Text Articles in Geotechnical Engineering
Large-Scale Model Forced-Vibration Test Comparison Of Test Results On Hard And Soft Ground, Takeshi Fujimori, Tomohiko Tsunoda, Kinji Akino, Masanori Izumi
Large-Scale Model Forced-Vibration Test Comparison Of Test Results On Hard And Soft Ground, Takeshi Fujimori, Tomohiko Tsunoda, Kinji Akino, Masanori Izumi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Forced-Vibration tests were performed on two large-scale same models constructed on soft and hard ground in order to investigate the effect of the hardness and the stratification of the supporting ground on the vibration characteristics of simulated reactor buildings. The soft ground is almost stratification ground, and the hard ground is almost uniform ground. The test models are RC rigid frame structure with shear walls. In the tests, sinusoidal wave excitation was applied by the excitor. The vibration characteristics of the test models, earth pressure at the bottom of the base mat and the vibration characteristics of the surrounding ground …
Liquefaction Tests By A Laminar Box In A Centrifuge, Kichio Suzuki, Ryouichi Babasaki, Yoshio Suzuki
Liquefaction Tests By A Laminar Box In A Centrifuge, Kichio Suzuki, Ryouichi Babasaki, Yoshio Suzuki
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new laminar box constructed with aluminum frames of 24mm wide and 10mm thick for model shaking tests on liquefaction phenomenon of soft saturated sandy soil in centrifugal gravity field was manufactured. The box was designed to develop shear distortion in the soil unimpeded by a rigid-type container. Liquefaction tests were performed on horizontally laid soft saturated sand and obtained the same results as Tokimatsu and Yoshimi 1983.
Prediction Of Fatigue Cracking And Rutting In Asphalt Pavements By Small-Scale Centrifuge Models, M. Hossien Roghani, V. P. Drnevich, Y. H. Huang
Prediction Of Fatigue Cracking And Rutting In Asphalt Pavements By Small-Scale Centrifuge Models, M. Hossien Roghani, V. P. Drnevich, Y. H. Huang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a summary of a study to investigate the feasibility of predicting fatigue cracking and rutting in full depth asphalt pavements by centrifuge modeling. This is accomplished by constructing a small-scale centrifuge model and measuring directly the resilient tensile strains at the bottom of asphalt layer and the accumulated permanent on the pavement surface under repeated loads. The purpose of using a centrifuge is to insure that the stresses and strains due to self-weight are the same in the small-scale model as in the prototype pavement. Model pavements in two different scales of 1:10 and 1:20 were constructed, …
Shaking Table Tests On Permanent Ground Displacement Due To Liquefaction, Susumu Yasuda, Hiroyoshi Kiku, Hideo Nagase
Shaking Table Tests On Permanent Ground Displacement Due To Liquefaction, Susumu Yasuda, Hiroyoshi Kiku, Hideo Nagase
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
To study the mechanism of permanent ground displacement due to liquefaction, shaking table tests were conducted. Moreover, vane tests and cyclic torsional shear tests were carried out to measure the rate of decrease of the elastic modulus and the shear strength due to liquefaction. Based on these test results, the authors proposed a simplified procedure for the prediction of permanent ground displacement. Measures to counter permanent ground displacement were also discussed based on the analysis.
Test On Behavior Of Pile Foundation In Liquefiable Soils, H. S. Liu, K. J. Chen
Test On Behavior Of Pile Foundation In Liquefiable Soils, H. S. Liu, K. J. Chen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A series of shaking table tests were conducted to clarify the compaction effects of pile driving on sandy soils, and to investigate the failure mechanism of pile foundation in liquefiable soils. The tests showed that the soil in piled zone was densified so greatly that it became non-liquefiable after pile driving. The pore pressure ratios within this zone were far lower than unit. The settlements of pile foundation were mainly caused by the movement of soil beneath pile tips to the liquefied zone which was outside the piled zone. The failure patterns of pile foundation were rather like the Meryerhoff's …
Analysis Of Liquefaction Hazard Due To Earthquake, Junfei Xie, Zhaoji Shi
Analysis Of Liquefaction Hazard Due To Earthquake, Junfei Xie, Zhaoji Shi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The aim of this work is to establish a quantitative analysis approach of liquefaction hazard. Based on the microscopic field data of liquefaction it is pointed out that non-uniform settlement of building is the primary type of damages caused by sand liquefaction during earthquake. Then a computation algorithm for evaluating settlements is programmed on the basis of “Softening model” idea, and 33 liquefaction settlement events are evaluated by use of this test-computation approach. The results of these evaluations are in good agreement with the observed ones.
Dynamic Properties Of Fine-Grained Coal Refuse, C. Robert Ullrich, Barry K. Thacker, Nancy R. Roberts
Dynamic Properties Of Fine-Grained Coal Refuse, C. Robert Ullrich, Barry K. Thacker, Nancy R. Roberts
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A simplified method of slope stability analysis is presented for upstream-constructed coal tailings dams subjected to earthquake shaking. The method employs a conventional method of slices approach, in which dynamic loads are represented as psuedostatic forces applied to each slice. Excess pore water pressures are estimated from cyclic triaxial tests performed on specimens of fine coal refuse. Cyclic triaxial test results are presented for fine coal refuse materials from six sites in the western Appalachian region. Measured excess pore water pressure values appear to be influenced by fine coal processing procedures, although material plasticity and grain characteristics are also important. …
Evaluation Of Liquefaction Potential For An Earth Dam Site, Bhagwat V. K. Lavania, J. N. Sharma, S. Mukerjee
Evaluation Of Liquefaction Potential For An Earth Dam Site, Bhagwat V. K. Lavania, J. N. Sharma, S. Mukerjee
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The foundation of the proposed Polavaram Earth and Rockfill Dam (India) has a sand deposit about 15 to 30 meters deep. The medium size sand is poorly to uniformly graded having relati.ve density in the range of 40-45% and angle of internal friction 30°. Standard Penetration Tests have been conducted in 22 bore holes at site and the N-counts have been observed to range between 4 to 111. The liquefaction potential of deposit under maximum credible earthquake (MCE) for the site has been evaluated by analyzing the data on the basis of prevailing empirical approaches and by the results of …
Fault Processes And Liquefaction In The Marine Environment, Ronald C. Chaney
Fault Processes And Liquefaction In The Marine Environment, Ronald C. Chaney
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
An Elastoplastic Model For Sand Liquefaction, Limin Zhang, Ting Hu
An Elastoplastic Model For Sand Liquefaction, Limin Zhang, Ting Hu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The stress-dilatancy relations of sand for the stress paths involved in a complete periodic stress cycle are set up. The plastic potential functions for' each loading stage are derived consequently. Based on the idea of using a stress-strain relationship as an alternative strain-hardening law, the drained volume changes under different effective stress paths are derived and verified. A pore pressure generation mechanism which can take into account the dilatancy of soli directly and the related computational model are put forward. The model can calculate the instantaneous and residual pore pressures in sand and depict the liquefaction process of sand quantitatively, …
Behavior Of Fine Sand Under Cyclic Rotation Of Principal Stresses Using The Hollow Cylinder Apparatus, Panos Dakoulas, Yuanhui Sun
Behavior Of Fine Sand Under Cyclic Rotation Of Principal Stresses Using The Hollow Cylinder Apparatus, Panos Dakoulas, Yuanhui Sun
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Results of an experimental investigation on a saturated fine Ottawa Silica Sand subjected to three different types of cyclic tests are presented in this paper. The effects of principal stress rotation at a constant deviator stress on the pore water pressure buildup and the deformation characteristics of sand are evaluated in comparison with results from cyclic triaxial and cyclic torsional simple shear using the hollow cylinder apparatus. The results presented and discussed in this article, representing a small part of the experimental program, suggest that the effects of rotational shear are more important than the effects of cyclic triaxial loading …
Session 3: Discussions And Replies, Multiple Authors
Session 3: Discussions And Replies, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Dynamic Strength And Permanent Deformation Of Saturated Sand, Masayuki Hyodo, Noriyuki Yasufuku, Hidekazu Murata, Takeharu Konami
Dynamic Strength And Permanent Deformation Of Saturated Sand, Masayuki Hyodo, Noriyuki Yasufuku, Hidekazu Murata, Takeharu Konami
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The undrained cyclic triaxial behavior of saturated sand has been studied using anisotropically consolidated specimens. The strength and deformation under various combinations of initial static and cyclic shear stresses were attempted to clarify. The cyclic strength was first discussed, and then, the residual shear strain was investigated related with effective stress ratio at the end of each stress cycle. Finally, an empirical model was proposed for evaluating the development of pore pressure and residual shear strain of saturated sand subjected to various initial static and subsequent cyclic shear stresses.
Liquefaction Analysis By Multi-Surface Model, Satoshi Morio
Liquefaction Analysis By Multi-Surface Model, Satoshi Morio
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In recent years, liquefaction phenomena induced by earthquakes have attracted considerable attention and extensive research has already been performed on various aspects. Also, many constitutive relations have been proposed in order to represent the deformation behavior during cyclic loading. These models, however, have mostly been verified by comparison stress or strain control element tests, and there have not been many numerical tests applying them to the boundary value problems. In this study, a simple and practical constitutive relation which is able to simulate the unelastic behavior of soils under multi-directional cyclic stresses is proposed. The proposed model has been introduced …
Preliminary Research In Predicting Liquefaction Potential Of Saturated Soil Using Vs, Qc, Chang Hong
Preliminary Research In Predicting Liquefaction Potential Of Saturated Soil Using Vs, Qc, Chang Hong
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In the paper, first describes the condition of the testing ground, then the circumstances of test (pressed wave velocity test & static cone penetration test, or vs & SCPT) is presented, i.e., the improvement of SCPT equipment make the test (Vs & SCPT) be in progress simultaneously, meanwhile, the SPT is conducted so that relations are found among the testing data. The results of tests are shown in this paper, the relative curves of sandy soil and sandy loam (Vs & N, qc & N) are gained respectively by way of analysing the test data, and experiential formulas of the …
Seismic Response Of Floating Piles To Obliquely Incident Waves, Shahid Ahmad, S. M. Mamoon
Seismic Response Of Floating Piles To Obliquely Incident Waves, Shahid Ahmad, S. M. Mamoon
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The response of single piles under vertically and obliquely incident SH, SV, and P waves is obtained using a hybrid boundary element (BEM) formulation. The piles are represented by compressible beam-column elements and the soil as a hysteretic viscoelastic half-space. A recently developed Green function corresponding to the dynamic Mindlin problem is implemented in the numerical formulation. Exact analytical solutions for the differential equations for the piles under distributed harmonic excitations are used. Treating the half-space as a three-dimensional elastic continuum, the interaction problem is formulated by satisfying equilibrium and displacement compatibility along the pile-soil interface. Solutions adopted for the …