A new procedure for tracking displacements of submerged sloping ground in centrifuge testing

Carey, Trevor J.; Stone, Nicholas; Kutter, Bruce L.; Hajialilue-Bonab, Masoud

doi:10.1201/9780429438646-9

Cited by 6 publications

(6 citation statements)

References 1 publication

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“…The time series labeled "combined" is obtained by adding the scaled IPRV ramp to the dynamic component of the displacement. Carey et al (2018aCarey et al ( , 2019b independently determined the displacement of the surface markers as a function of time using the highspeed cameras and demonstrated that superposition of the dynamic displacements from accelerometers on the IPRV ramp produces a reasonable approximation of the displacement time series. From Fig.…”

Section: Displacement Response Of the Soil Layers In First Destructivmentioning

confidence: 99%

LEAP-UCD-2017 Comparison of Centrifuge Test Results

Kutter

Carey

Stone

et al. 2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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This paper compares experimental results from every facility for LEAP-UCD-2017. The specified experiment consisted of a submerged medium-dense clean sand with a 5-degree slope subjected to 1 Hz ramped sine wave base motion in a rigid container. The ground motions and soil density were intentionally varied from experiment to experiment in hopes of defining the slope of the relational trend between response (e.g., displacement, pore pressure), intensity of shaking, and density or relative density. This paper is also intended to serve as a useful starting point for overview of the experimental results and to help others find specific experiments if they want to select a subset for further analysis. The results of the experiments show significant differences between each other, but the responses show a significant correlation, R 2~0 .7-0.8, to the known variation of the input parameters.

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Section: Displacement Response Of the Soil Layers In First Destructivmentioning

confidence: 99%

LEAP-UCD-2017 Comparison of Centrifuge Test Results

Kutter

Carey

Stone

et al. 2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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“…displacements of a centrifuge model using a wave suppressing window, GoPro cameras, and GEO-PIV software (Carey et al 2018b) was developed. The bottom of the wave suppressing window was located beneath the fluid surface to reduce distortion due to water surface waves, like a glass-bottomed boat as shown in Figs.…”

Section: Advancements In Centrifuge Testingmentioning

confidence: 99%

“…GEO-PIV was used to process the images to produce displacement time histories (Stanier et al 2015). Carey et al (2018b) describe how displacements were converted from pixels to mm using conversion factors specific to each camera.…”

Section: Advancements In Centrifuge Testingmentioning

confidence: 99%

“…An additional benefit of using GEO-PIV to determine downslope displacements is that displacements may be found at more locations because it can track the movement of patches of sand between surface markers. Figure 13.18 compares displacement time histories generated by GEO-PIV to those found using the IPRV method and accelerometer data, a method to estimate displacement time histories developed by Kutter et al (2017) and modified by Carey et al (2018b) for UCD3 M1. The dynamic displacement of the IPRV method is the relative displacement between the base accelerometers and AH4, found by double Fig.…”

Section: Advancements In Centrifuge Testingmentioning

confidence: 99%

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LEAP-UCD-2017 Centrifuge Test at University of California, Davis

Carey

Stone

Hajialilue-Bonab

et al. 2019

Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading

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Three centrifuge experiments were performed at the University of California, Davis, for LEAP-UCD-2017. LEAP is a collaborative effort to assess repeatability of centrifuge test results and to provide data for the validation of numerical models used to predict the effects of liquefaction. The model configuration used the same geometry as the LEAP-GWU-2015 exercise: a submerged slope of Ottawa F-65 sand inclined at 5 degrees in a rigid container. This paper focuses on presenting results from the two destructive ground motions from each of the three centrifuge models. The effect of each destructive ground motion is evaluated by accelerometer recordings, pore pressure response, and lateral deformation of the soil surface. New techniques were implemented for measuring liquefaction-induced lateral deformations using five GoPro cameras and GEO-PIV software. The methods for measuring the achieved density of the as-built model are also discussed.

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“…DIC also uses image analysis of videos recorded from one or more cameras to obtain twodimensional or three-dimensional (3D) movements of targets. Carey et al (2018) used five cameras and soil surface markers to track dynamic and residual displacements of a submerged sloping liquefied ground using the software GEOPIV. Sinha et al (2021c) used four high-speed cameras and the image analysis software TEMA (ISMA, 2019) to obtain 3D movements of the soil surface and a pile subject to shaking in liquefiable ground.…”

Section: Introductionmentioning

confidence: 99%

Measuring vertical displacement using laser lines and cameras

Sinha

Kutter

Ziotopoulou

2023

International Journal of Physical Modelling in Geotechnics

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Measuring displacements in model tests typically involves contact-based sensors such as linear potentiometers, where contact between two moving parts occurs at the sensing point. The sensor's finite mass, the limited stiffness of the beams and the clamping mechanism, and the slippage and hinging of the sensor body could affect the object's response and lead to measurement errors. Also, the physical mounting rack required to hold these sensors often obstructs the view and makes significant areas unavailable for conducting some other essential investigations. The advancement in high-speed, high-resolution and reasonably priced rugged cameras makes it feasible to obtain better displacement measurements by image analysis. This paper introduces a non-contact method that works by video recording the projection of laser lines on a test object to measure static and dynamic vertical displacements. The technique produces a continuous settlement distribution along the laser line passing through multiple objects of interest. This paper presents the theory for converting laser line images to displacements. The new method's validity is demonstrated by comparing the results from other measurement techniques: hand measurements, linear potentiometers and three-dimensional stereophotogrammetry.

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A new procedure for tracking displacements of submerged sloping ground in centrifuge testing

Cited by 6 publications

References 1 publication

LEAP-UCD-2017 Comparison of Centrifuge Test Results

LEAP-UCD-2017 Comparison of Centrifuge Test Results

LEAP-UCD-2017 Centrifuge Test at University of California, Davis

Measuring vertical displacement using laser lines and cameras

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