A Laboratory-Scale Evaluation of Smart Pebble Sensors Embedded in Geomaterials

This paper introduces a novel approach to measure deformations in geomaterials using the recently developed 'Smart Pebble' sensors. Smart Pebbles were included in triaxial test specimens of unbound aggregates stabilized with geogrids. The sensors are equipped with an aggregate particle/pos...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2024-05, Vol.24 (9), p.2733
Main Authors: Husain, Syed Faizan, Abbas, Mohammad Shoaib, Wang, Han, Qamhia, Issam I A, Tutumluer, Erol, Wallace, John, Hammond, Matthew
Format: Article
Language:English
Subjects:
aggregate
Algorithms
Analysis
Communication
Custom design
Engineering
Equipment and supplies
geogrid
Kalman filters
Laboratories
Laboratory equipment
Morphology
resilient deformation
sensor
Sensors
Traffic
Trends
triaxial test
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Summary:This paper introduces a novel approach to measure deformations in geomaterials using the recently developed 'Smart Pebble' sensors. Smart Pebbles were included in triaxial test specimens of unbound aggregates stabilized with geogrids. The sensors are equipped with an aggregate particle/position tracking algorithm that can manage uncertainty arising due to signal noise and random walk effects. Two Smart Pebbles were placed in each test specimen, one at specimen's mid-height, where a geogrid was installed in the mechanically stabilized specimen, and one towards the top of the specimen. Even with simple raw data processing, the trends on linear vertical acceleration indicated the ability of Smart Pebbles to assess the geomaterial configuration and applied stress states. Employing a Kalman filter-based algorithm, the Smart Pebble position coordinates were tracked during testing. The specimen's resilient deformations were simultaneously recorded. bender element shear wave transducer pairs were also installed on the specimens to further validate the Smart Pebble small-strain responses. The results indicate a close agreement between the BE sensors and Smart Pebbles estimates towards local stiffness enhancement quantification in the geogrid specimen. The study findings confirm the viability of using the Smart Pebbles in describing the resilient behavior of an aggregate material under repeated loading.
ISSN:1424-8220
1424-8220
DOI:10.3390/s24092733