ORCID Profile
0000-0002-9101-5325
Current Organisation
University of Massachusetts Dartmouth
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Engineering | Civil Geotechnical Engineering | Geomechanics and Resources Geotechnical Engineering |
ANZSRC Socio-Economic Objective (SEO)
Related Links
Publications
Theory on Measuring Orientation with MEMS Accelerometers in a Centrifuge
Publisher: American Society of Civil Engineers
Date: 17-03-2015
Comparison of 2D Optical Imaging and 3D Microtomography Shape Measurements of a Coastal Bioclastic Calcareous Sand
Publisher: MDPI AG
Date: 14-03-2022
Abstract: This article compares measurements of particle shape parameters from three-dimensional (3D) X-ray micro-computed tomography (μCT) and two-dimensional (2D) dynamic image analysis (DIA) from the optical microscopy of a coastal bioclastic calcareous sand from Western Australia. This biogenic sand from a high energy environment consists largely of the shells and tests of marine organisms and their clasts. A significant difference was observed between the two imaging techniques for measurements of aspect ratio, convexity, and sphericity. Measured values of aspect ratio, sphericity, and convexity are larger in 2D than in 3D. Correlation analysis indicates that sphericity is correlated with convexity in both 2D and 3D. These results are attributed to inherent limitations of DIA when applied to platy sand grains and to the shape being, in part, dependent on the biology of the grain rather than a purely random clastic process, like typical siliceous sands. The statistical data has also been fitted to Johnson Bounded Distribution for the ease of future use. Overall, this research demonstrates the need for high-quality 3D microscopy when conducting a micromechanical analysis of biogenic calcareous sands.
Centrifuge and numerical modeling of monopiles for offshore wind towers installed in clay
Publisher: American Society of Mechanical Engineers
Date: 31-05-2015
Abstract: Offshore wind power has gained momentum as a means to ersify the world’s energy infrastructure however, little is still known of the global stiffness behavior of the large diameter low aspect ratio monopiles which have become the foundation of choice for offshore wind towers. Traditionally, offshore foundations have been associated with gravity structures for the oil and gas industry, which in general need to resist large vertical loads with limited lateral and moment loading. However, wind towers are purposely designed to be subjected to large lateral and moment loads from the wind and waves in order to maximize power generation. Geotechnical centrifuge tests were conducted and numerical models are being developed to examine the behavior of low aspect ratio piles in clayey soils. Monopiles with aspect ratio of two are being tested in the the 150g-ton centrifuge at Rensselaer Polytechnic Institute. Initial results include momenttheta and force-displacement for various loading conditions. Numerical studies consist of finite element (FE) simulations in order to predict capacities and permanent deformations. The comparisons are to be performed in terms of the total resistance that is exerted by the soil on the caisson. FE studies allow to model capacity for different displacement fields and also to compute interactions between different loading modes. This paper outlines our progress to date including both numerical and experimental results.
Installability of a Multiline Ring Anchor System in a Seabed under Severe Environmental Conditions
Publisher: IEEE
Date: 20-09-2021
Optimized 3D Segmentation Algorithm for Shelly Sand Images
Publisher: Avestia Publishing
Date: 08-2020
DOI: 10.11159/CIST20.107
Development of a P-Wave Transponder System for Tracking Buried Objects in 1-g and Geotechnical Centrifuge Models
Publisher: American Society of Civil Engineers
Date: 30-03-2017
Geological and Geotechnical Characteristics of Glauconitic Sands
Publisher: American Society of Civil Engineers
Date: 17-03-2022
Granulometry of Two Marine Calcareous Sands
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2021
Optimal Design of a Deeply Embedded Ring Anchor in Soft Clay Overlying Bedrock under Vertical Loading
Publisher: American Society of Civil Engineers
Date: 23-03-2023
Rotational Behavior of Squat Monopiles in Soft Clay from Centrifuge Experiments
Publisher: American Society of Civil Engineers
Date: 08-08-2016
Effect of Wing Plates on Vertical Load Capacity of a Multiline Ring Anchor System in Clay
Publisher: American Society of Civil Engineers
Date: 17-03-2022
The Granular Structure of Two Marine Carbonate Sediments
Publisher: American Society of Mechanical Engineers
Date: 17-06-2018
Abstract: Calcareous sediments are prominent throughout the low-latitudinal offshore environment and have been known to be problematic for offshore foundation systems. These fascinating soils consist largely of the skeletal remains of single-celled marine organisms (plankton and zooplankton) and can be as geologically complex as their onshore siliceous counter parts. To enable an adequate understanding of their characteristics, in particular, their intra-granular micro-structure, it is important that geotechnical engineers do not forget about the multifaceted biological origins of these calcareous sediments and the different geological processes that created them. In this paper, the 3D models of soils grains generated from micro-computed tomography scans, scanning electeron microscope images, and optical microscope images of two calcareous sediments from two different depositional environments are presented and their geotechnical implications discussed. One is a coastal bioclastic sediment from Perth, Western Australia that is geologically similar to carbonate sediments typically used in micro-mechanics and particle crushing studies in the literature. The other is a hemipelagic sediment from a region of the North West Shelf of Australia that has historically been geotechnically problematic for engineers. The results show there is a marked difference between coastal bioclastic and hemipelagic sediments in terms of geological context and the associated particle micro-structures. This brings into question whether a coastal bioclastic calcareous sediment is a good micro-mechanical substitute for a hemipelagic one.
Capacity of Short Piles and Caissons in Soft Clay from Geotechnical Centrifuge Tests
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2019
Effect of degradation on geotechnical behavior of glauconite sands from the U.S. Mid-Atlantic Coastal Plain
Publisher: Elsevier BV
Date: 09-2023
Exploring the lateral capacity of squat piles in soft clay through geotechnical centrifuge modelling
Publisher: IEEE
Date: 06-2017
Impact of Biology on Particle Crushing in Offshore Calcareous Sediments
Publisher: American Society of Civil Engineers
Date: 21-03-2019
Volumetric Particle Size Distribution and Variable Granular Density Soils
Publisher: ASTM International
Date: 08-04-2019
DOI: 10.1520/GTJ20180286
Centrifuge 2D gravity on a vertical rotational reference frame
Publisher: Thomas Telford Ltd.
Date: 2019
Abstract: With the advent of high-accuracy sensors and increased interest in geotechnical centrifuge testing simulating loading within serviceability limits, a stronger understanding of the magnitude and orientation of centrifuge gravity relative to the scale model is necessary. This paper presents a methodology for determining two-dimensional centrifuge gravity within a model independently of centrifuge type or geometry, which can be used to recompose the gravity field from the direct measurement of a single gravity vector, given angular velocity. Finally, the methodology is compared to the mechanics of drum and beam centrifuges to provide physical meaning to coordinate rotation variables.
Use of a MEMS accelerometer to measure orientation in a geotechnical centrifuge
Publisher: Thomas Telford Ltd.
Date: 09-2018
Abstract: Microelectromechanical systems (MEMS) accelerometers are becoming more prevalent in geotechnical engineering and geotechnical centrifuge modelling. In centrifuge experiments these sensors have shown great promise, but still exhibit limitations. This paper proposes a new methodology for the use of single-axis, low-g, high-accuracy MEMS accelerometers to measure the orientation of an object on the vertical rotational plane of centrifugal acceleration and Earth's gravity in a geotechnical centrifuge. The method specifically compensates for the measured cross-axis acceleration by an MEMS accelerometer when in a high-g environment. This is done by determining the apparent internal misalignment of the MEMS sensing unit, relative to its packaging, from a high-g cross-axis calibration. The misalignment can then be used to correct the measured orientation of the sensor relative to a centrifuge gravity vector. When compared to simplified approaches, measurements of absolute orientation are improved by 0·89° and the standard deviation of measurements between multiple sensors is reduced by 0·71°. Overall, this new methodology significantly improves the accuracy of orientation measurements by MEMS accelerometers in the geotechnical centrifuge, opening the door to use these inexpensive sensors in more experiments.
Uplift Resistance of a Multiline Ring Anchor System in Soft Clay to Extreme Conditions
Publisher: American Society of Civil Engineers
Date: 04-11-2021
Nonlinear soil-structure behavior of a deployable and compliant anchor system
Publisher: Canadian Science Publishing
Date: 06-2021
Abstract: This paper presents a novel compliant geo-structural systems bio-inspired by awns on grass seeds for increasing anchor capacity while minimizing material usage. A compliant deployable structure is here defined as a system that reacts to global displacements by continued elastic shape change and awns are slender flexible structures rigidly connected to the exterior of an anchor. When the anchor is loaded in tension, the awns react off the soil mass and deploy outwards from the pile shaft, enabling space-saving measures for transportation. This paper creates a structural pushover model to establish awn deformations and stress values, a scale model of the compliant system fabricated using additive manufacturing, geo-plasticity numerical models of soil awn interaction, and a finite element model of an ex le application. This research elucidates the soil displacement mechanisms around the awns, the structural deformation of in idual awns, and the enhancement of overall anchor capacity due to awn deployment.
The Use of Sodium Pyrophosphate to Improve a Translucent Clay Simulate
Publisher: American Society of Civil Engineers
Date: 08-08-2016
Related Organisations
University Of Massachusetts Dartmouth
Location: United States of America
Related Funding Activities
Australian Laureate Fellowships - Grant ID: FL130100059
Start Date: 2014
End Date: 02-2019
Amount: $3,204,762.00
Funder: Australian Research Council
View Funded Activity