Cyclic Shear Strength of Silts and Sands under Cyclic Loading
Bildiriler > Tam Metin Bildiri
Yazarlar: Selim ALTUN, A. Burak Göktepe, Cem Akgüner
Earthquake Engineering and Soil Dynamics, , , Uluslararası, Tam Metin Bildiri, ss 1-11
DOI: 10.1061/40779(158)33
Özet
The effect of fines content on the liquefaction of sandy soils has been investigated widely. However, currently there are contradicting suggestions and findings based on laboratory measurements and/or field observations. In this study, a series of stress-controlled hollow cylinder cyclic torsional triaxial shear tests were conducted on saturated samples of clean Toyoura sand and four rock crushed soils from a single source with varying silt contents. A uniform cyclic sinusoidal loading at a 0.1 Hz frequency was applied to the samples prepared by the air pluviation method through a series of sieves. Tests were conducted on samples where the fines content, anisotropy, confining pressure and relative density were varied one-at-a-time while others were held constant. Cyclic shear stress-strain changes, the number of cycles to reach liquefaction and pore pressures variations were recorded. Results indicate that there was a reduction in the liquefaction resistance as the silt content increased from 0% to 20% followed by an increase of resistance for samples with 80% silt content. Rock crushed materials with their angular particle shapes and comparatively wider range of grain sizes were more resistant to liquefaction than uniform clean fine sands. Anisotropical consolidation and confining pressures also had an impact on the liquefaction behavior.