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Influence of specimen-reconstituting method on the undrained response of loose granular soil under static loading

Acta Mechanica Sinica 2011年第5期27卷 796-802页

作者： Noureddine Della Ahmed Arab mostefa belkhatir Laboratory of Material Sciences and Environment Civil Engineering DepartmentUniversity of ChlefSendjas Street PO Box 151 Chlef 02000Algeria

This paper describes the results of an experimental study on the undrained shear behaviour of loose sand collected from the location close to the epicenter of the recent Chlef （Algeria） Earthquake （October 10,1980）.The study focuses on the effects of the mode of the soil deposition on the liquefaction resistance of the Chlef *** this purpose,the results of undrained monotonic triaxial compression tests performed on samples with initial density of 0.29 under initial confining pressures ranged from 50 kPa to 200 kPa are *** specimens were prepared by two depositional methods namely dry funnel pluviation and wet *** was found that there was a marked difference in the undrained behaviour of sand in terms of maximal deviatoric stress,peak strength,residual strength and excess pore water pressure,even though the density and stress conditions were *** conclusion was that the soil fabric was responsible for this *** results indicated also that at low confining pressures,the specimens reconstituted by the wet deposition method exhibited complete static liquefaction （zero effective confining pressure and zero stress difference）.

关键词： Liquefaction · Undrained · Dry funnel pluviation · Wet deposition · Residual strength

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Laboratory Study of Geotextiles Performance on Reinforced Sandy Soil

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Journal of Earth Science 2016年第6期27卷 1060-1070页

作者： Brahim Abdelkader Arab Ahmed belkhatir mostefa Shahrour Isam Laboratory of Materials Sciences and Environment Civil Engineering Department Hassiba Ben Bouali University of ChiefChief 02000Algeria Laboratory of Civil Engineering and Geo-Environment(LGCGE) University of Lille 1Villeneuve d'Ascq 59650France

This paper presents the results of triaxial tests conducted for the investigation of the influence of geotextiles on stress-strain and volumetric change behaviour of reinforced sandy soil. Tests were carried out on loose sandy soil. The experimental program includes drained compression tests on samples reinforced with different values of both geotextiles layers （Ng） and confining pressure （σ′c）. Two methods of preparation were used： air pluviation （AP） and moist tamping （MT）. Test results show that the geotextiles induce a quasi-linear increase in the stress deviator （q） and volume contraction in the reinforced sand. Method of preparation significantly affects the shear strength; samples prepared by the air pluviation method and mobilized deviator stresses are significantly higher than those prepared by moist tamping method. Geotextiles restrict the dilation of reinforced sandy soil and consequently the contraction increases. The mobilized friction angle increases with increasing number of layers and decreases with increasing initial confining pressure. Samples prepared by moist tamping present mobilized friction angles significantly lower than those prepared by air pluviation method. For samples prepared by the air pluviation method, the secant modulus at ε1=1% and 5% decreases with increasing geotextile layers; those prepared by the moist tamping method, secant modulus at ε1=1% and 5% increases with increasing number of geotextile layer sand confining pressure. From 10% axial strain, secant modulus increases with increasing inclusions of geotextile layers.

关键词： sand triaxial geotextile drained method of preparation strength.

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