Effect of Soil Particle Size on the Accuracy of Tactile Pressure Sensors

AbstractThis paper investigates the effects of soil particle size on the measurement accuracy of single-point type tactile pressure sensors when used for measuring soil contact stresses. Sensors with two different diameters (Dsens) are integrated into an oedometer cell. Granular materials with a wid...

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Bibliographic Details
Published in:Journal of geotechnical and geoenvironmental engineering 2022-10, Vol.148 (10)
Main Authors: Kootahi, Karim, Leung, Anthony Kwan
Format: Article
Language:English
Subjects:
Accuracy
Contact pressure
Contact stresses
Diameters
Granular materials
Measurement
Particle size
Pressure sensors
Ratios
Sensors
Soil
Soil stresses
Soils
Technical Note
Technical Notes
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Summary:AbstractThis paper investigates the effects of soil particle size on the measurement accuracy of single-point type tactile pressure sensors when used for measuring soil contact stresses. Sensors with two different diameters (Dsens) are integrated into an oedometer cell. Granular materials with a wide range of particle diameters (D50) and angularities (from rounded to irregular shaped) are evaluated, resulting in a wide range of ratios of Dsens/D50 from 2.6 to 105.8. The test results show that the soil particle size significantly affects and exponentially correlates with the measurement accuracy of the sensor. A threshold Dsens/D50 of 10.5 is identified for the sensor, beyond which the error is less than 5%. It is also shown that even for ratios of Dsens/D50 as large as 40, an error of approximately 2% can be observed, which is intrinsic to the sensor.
ISSN:1090-0241
1943-5606
DOI:10.1061/(ASCE)GT.1943-5606.0002899