46 Chapter 4 EFFECT OF FABRIC ON SHEAR WAVE VELOCITY IN GRANULAR MATERIALS [1] U. Mital, R.Y. Kawamoto, and J.E. Andrade. “Effect of fabric on shear wave velocity in granular materials”. submitted. 2016. 4.1 Introduction The small-strain elastic shear wave velocity (V S ) is a basic mechanical property of soils and is an important parameter in geotechnical engineering. Together with the results of standard and cone penetration tests, it helps model the response of geoma- terials to dynamic loading processes such as earthquakes and vibrations. Recently, V S has been adopted as one of the indices (in addition to penetration resistance) for development of liquefaction charts [5, 34, 88]. Liquefaction charts are developed using the “simplified procedure” and are used to evaluate liquefaction resistance of soils in earthquake-prone regions [71]. The use of V S as an index to quantify liquefaction resistance is based on the fact that both V S and liquefaction resistance are similarly affected by many of the same parameters (such as void ratio, stress state, stress history and geologic age) [5]. Therefore, an understanding of how such parameters affect V S helps in understand- ing the effect of such parameters on liquefaction resistance of soils. For instance, the effect of parameters such as relative density, stress state, and geologic age on soil resistance indices such as V S are accounted for, and consequently their effects are incorporated in the evaluation of liquefaction resistance [34, 88]. Another impor- tant parameter whose effect is widely acknowledged to have a significant influence on liquefaction resistance is grain arrangement, or fabric [34]. Experiments have shown that the method of sample preparation, or the depositional environment, can significantly affect soil fabric and cause soils with the same stress states and relative densities to behave differently [46, 47, 62]. In fact, the effect of fabric has been es- tablished as a major concern when it comes to testing field samples in the laboratory, on account of sampling disturbance destroying the grain fabric. Quantification of in-situ fabric is still an open problem, and hence considerable judgement is needed in order to map laboratory test results to field conditions.
EFFECT OF FABRIC ON SHEAR WAVE VELOCITY IN GRANULAR MATERIALS
May 17, 2023
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