Specimens size effect D/H on cyclic behaviour and liquefaction potential of clean sand

Autor: Mohamed Chekired, Mourad Karray, Samaneh Amipour, Marwan Khashila, Aya Bayoumi
Rok vydání: 2021
Předmět:
Zdroj: Acta Geotechnica. 17:2047-2057
ISSN: 1861-1133
1861-1125
DOI: 10.1007/s11440-021-01339-x
Popis: Owing to the lack of complementary shear stress on vertical boundaries of a direct simple shear (DSS) specimen, the stress/strain distributions in soil specimens are not uniform. Although the previous studies discussed the effect of diameter-to-height ratio (D/H) on the mechanical and dynamic properties of soil, there is a lack of experimental studies that cover the influence of D/H ratio on the liquefaction potential of sand under stress and strain-controlled conditions. In this study, the influence of the D/H ratio on the cyclic behaviour and liquefaction potential of Ottawa sand C-109 and Ottawa sand F-65 specimens is experimentally investigated. Reconstituted soil specimens of Ottawa sands were prepared at four different D/H ratios using the combined triaxial simple shear (TxSS) and conventional DSS devices. The influence of the D/H ratio on the cyclic behaviour in terms of pore pressure generation and decay of the cyclic stress ratio is emphasized and implicitly discussed with the aid of the energy concept. The stress distribution inside the specimen was deduced and demonstrated by numerical simulation of the TxSS test using a pre-calibrated coupled energy-based pore pressure model. The results indicate that the soil specimens with a D/H ratio greater than 2.5 induce comparable liquefaction potential irrespective of the D/H ratio.
Databáze: OpenAIRE
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