Dynamic properties of soils at low strains in Roorkee region using resonant column tests

Maheshwari, B. K.; Kirar, Bablu

doi:10.1080/19386362.2017.1365474

Cited by 9 publications

(1 citation statement)

References 13 publications

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“…Most experts define the damping ratio as the energy loss in a close hysteresis loop. The latter is obtained in laboratory tests by applying frequency-modulated harmonic shear loads/unloads and measuring the stress vs. strain values [39][40][41]. Another laboratory technique is based on counting the free vibrations after forced cyclic loading.…”

Section: Damping Ratiomentioning

confidence: 99%

A Computer-Aided Algorithm Combined with an Integrated Downhole Method to Improve Shear Wave Detection and Damping Ratio Assessment: Theory and Preliminary Results

Grelle

2023

Applied Sciences

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This contribution introduces a computerized semi-automated procedure coupled with a dedicated algorithm to improve shear wave velocity assessment and the on-site elastic damping ratio estimation of ground materials. The standard equipment of the downhole method is integrated with a horizontal geophone (guardian) placed on the field surface. Mask tapering and band multi-filter functions improve first arrival, recognizing and isolating SH-wave trains to estimate damping ratio profiles. These are computed by treating signals using a frequency–time combined approach (frequency–time packets method). The signals are corrected to consider the different source pulse amplitude, the effects of the propagation path, and scattering. The damping ratio profile is statistically computed in terms of the local drift of trend on the amplitude ratio series that would otherwise have a normal distribution centered on zero. These profiles intercept the lithology changes in the test sites and meet the damping values stemming from previous field tests and the laboratory experimental tests available in the literature regarding materials such as the ones investigated here.

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Section: Damping Ratiomentioning

confidence: 99%