NON-CONTACT ESTIMATION OF STRAIN PARAMETER-TRIGGERING LIQUEFACTION

Authors

  • Erica Elice S. Uy
  • Toshihiro Noda
  • Kentaro Nakai
  • Jonathan R. Dungca

Keywords:

Cyclic Loading, Non-Contact Measurement, Strain Parameter-Triggering Liquefaction, Curvature Correction

Abstract

The strain parameter-triggering liquefaction is usually determined by implementing cyclic
strain approach with a corresponding laboratory experiment. These parameters are threshold shear strain,
cyclic shear strain and cyclic shear strain that would trigger liquefaction. In this study, non-contact
measurement technique was implemented to estimate and monitor the development of the mentioned
parameters. In this technique, a mirrorless camera and Lucas and Kanade pyramidal optical flow algorithm
were utilized to track the movement of the particles. The camera was first calibrated to eliminate the errors
from the lens and the scene as well. Furthermore, curvature correction was applied because the sample tested
has a curved profile. The comparison was made with the loose and medium dense conditions. The samples
were tested under a consolidated undrained cyclic triaxial test at 2.4, 1.6 and 0.8 mm strain amplitudes. The
confining pressures used were 50, 100 and 200 kPa. Based on the results, a non-contact measurement
technique can estimate the parameters. A range of values was established due to the non-homogeneous
movement of the soil.

Downloads

Published

2019-01-10

How to Cite

Erica Elice S. Uy, Toshihiro Noda, Kentaro Nakai, & Jonathan R. Dungca. (2019). NON-CONTACT ESTIMATION OF STRAIN PARAMETER-TRIGGERING LIQUEFACTION. GEOMATE Journal, 16(57), 82–88. Retrieved from https://geomatejournal.com/geomate/article/view/2835

Issue

Section

Articles