centrifuge shaking table modeling of liquefaction
Speaker Information: Kenji Ishihara Colloquium Series on ...
Data for the models were obtained from a dynamic centrifuge testing program (involving uni and multidirectional shaking) and a thorough review of 1g shakingtable tests, dynamic centrifuge tests, and welldocumented freefield and building settlement case records.
WhatsAppCentrifuge Modeling of Settlement and Lateral Spreading ...
from approximately 70 sensors and all shaking events are available via the Internet in welldocumented data reports. A Deformation Index (DI), which combines the influences of depth, density, and layer thickness, was found to correlate reasonably well with liquefactioninduced settlements and lateral deformations. It was found that a thick,
THE INFLUENCE OF STRESS DENSIFICATION AND .
several shaking table tests (Florin and Ivanov 1961). However, it is not known whether this is due to stress densification or other factors. It is difficult to derive any conclusion from 1g shaking table tests because of extremely low stress levels, resulting in excessive dilation. Table 1. Excess pore pressure profiles of centrifuge tests.
CENTRIFUGE MODELING FOR SLIDING OF GENTLE SLOPE ON ...
CENTRIFUGE MODELING FOR SLIDING OF GENTLE SLOPE ON PARTIALLY SATURATED FINE SAND SUBJECT TO SINUSOIDAL GROUND MOTION Jeawoo LEE 1, Kazuo YOSHIZAKO2, Takashi SAKANOUE3 and Naoto OHBO4 ABSTRACT This paper presents an experimental approach, based on centrifuge modeling, for investigating the
LIQUEFACTION INDUCED SETTLEMENTS OF BUILDINGS .
Description of Centrifuge Shaking Table Tests 13 8 silica sand (Dr=50% or 65%) 7 silica sand (Dr=50%) silicon oil (50cst) 7 silica sand (Dr=50% or 65%) 700 200 (10m) 220 (unit mm) (model scale) Experimental Variables Contact pressure Building height and width Mass eccentricity ratio Groundwater depth Thickness and Density of Liquefied soil
CENTRIFUGE SIMULATIONS OF LARGESCALE SHAKING TABLE .
Lifesize steel and prestressed concrete piles were used in these tests. The largescale tests involved intense shaking that produced strong nonlinear stressstrain effects and degradation of soil stiffness due to liquefaction in the foundation soil models. The dynamic centrifuge tests treated the largescale models as their prototypes.
Centrifuge Simulations of LargeScale Shaking Table Tests ...
Also, a slightly lower degree of saturation in the largescale model could have contributed to this difference. After 6 s, the lower portions of the sand layers in both systems became lique?ed due to continued shaking. In the centrifuge model, the zone of liquefaction gradually expanded towards the surface of the sand layer due to dissipation.
Centrifuge Model Tests on Failure Behavior of Gridform ...
yielding of the soilcement model. The superstructure was modeled after a low rise building. A series of shaking table tests were conducted with liquefiable sand deposit. However, no liquefaction was observed. This cause will be low water table level (WL = ). So, the water table level at next series of tests was set higher than that in this paper [10].
Paulina Bakunowicz Research Assistant İzmir Institute ...
♦ Advanced geotechnical mathematical modeling skills (proficient in FEM and DEM modeling as well as implemented a coupled DEM/SAMPLE formulation) ♦ Performed dynamic testing of large scale shaking table models (simulation of seismic liquefaction). ♦ Excellent problem solving and analytical skills.
Effects of Void Redistribution on Liquefaction Flow of ...
A program of dynamic centrifuge modeling tests and laboratory triaxial tests are proposed, in collaboration with a proposed program of lg shaking table tests conducted by Professor Kokusho at Chuo University, Japan, to study this problem.
Numerical modeling of liquefaction effects: Development ...
Numerical modeling of liquefaction effects: Development initial applications of a sand plasticity model ... Shaking table tests conducted by De Alba et al (1976): initial confining ... Dynamic centrifuge model studies provide a valuable basis for
Geotechnical Engineering, Columbia University
Liquefaction, Flotation of Pipelines and Mitigation: Joint research has been conducted using the threedimensional shaking table at NRIAE. Recently, a large laminar box (inner dimensions: cm x 72 cm x cm) has been fabricated with the liquefaction tests conducted using the centrifuge facilities at the Rensselaer Polytechnic Institute. Theoretical studies were also made through the numerical .
Modeling Flowslides Caused by Static Loading
strainsoftening liquefaction response is noted, and such a material could undergo static liquefaction. . CENTRIFUGE MODELING Centrifuge modeling is a technique for reducedscale physical mod eling of gravitydependent phenomena, such as soil slope behavior. Because a fullscale soil structure is in equilibrium under the Earth's Silt Sand
Liquefaction centrifuge modeling of sands of different ...
N2 This paper presents the results of six centrifuge model tests of liquefaction and earthquakeinduced lateral spreading of fine Nevada sand using an inclined laminar box. The centrifuge experiments simulate a gently sloping, 10 m thick stratum of saturated homogeneous sand of infinite lateral extent and relative densities ranging from 45 to 75%.
Centrifuge Modeling on Seismic Behavior of Pile in ...
Therefore soilstructure interaction effects must be properly considered in the pile design. Two tests by using the centrifuge shaking table were conducted at an acceleration field of 80 g to investigate the seismic response of piles attached with different tip mass and embedded in liquefied or nonliquefied deposits during shaking.
SOME IMPORTANT ASPECTS IN EXPERIMENTAL SETUP FOR ...
On the other hand, the sand which is planned to be used in the shaking table tests is representative for the alluvial deposits around the Vardar River and the performed investigations can be good basis for further definition and higher awareness of the liquefaction hazard in Republic of Macedonia.
Centrifuge Model Testing of Liquefaction Mitigation via ...
Oct 10, 2019· The cemented centrifuge models were compared to a pair of uncemented saturated Ottawa sand models with initial D R 0 ≈ 38 and 53% and subjected to similar levels of shaking. Cone penetration resistances and shear wave velocities were monitored throughout shaking to investigate (1) the effect of cementation on cone penetration resistance ...
Effect of NonUniform Gravitational Field on Seismically ...
It the surface curvature formed by the end of the shaking event is equal to the length of the arm of the centrifuge The final curvature in reality soil, the existence of water in the model, which the sand layers have, and other factors this empirical approach cannot be used variation of this correction with time.