Abstract
Abstract This paper presents results of a series of undrained monotonic compression tests on loose sand reinforced with geotextile mainly to study the effect of confining stress on the mechanical behaviour of geotextile reinforced sand. The triaxial tests were performed on reconstituted specimens of dry natural sand prepared at loose relative density (Dr = 30%) with and without geotextile layers and consolidated to three levels of confining pressures 50, 100 and 200 kPa, where different numbers and different arrangements of reinforcement layers were placed at different heights of the specimens (0, 1 and 2 layers). The behaviour of test specimens was presented and discussed. Test results showed that geotextile inclusion improves the mechanical behaviour of sand, a significant increase in the shear strength and cohesion value is obtained by adding up layers of reinforcement. Also, the results indicate that the strength ratio is more pronounced for samples which were subjected to low value of confining pressure. The obtained results reveal that high value of confining pressure can restrict the sand shear dilatancy and the more effect of reinforcement efficiently.
Highlights
Chlef sand, which is widely distributed in the broad alluvial valley crossed by the Chlef River up to the zone of confluence of this river with the Fodda River, is generally medium soil in which more than 95% is particle size with some proportion of minerals as feldspar and quartz
The sample subjected to low level of confining pressure shows behaviour of limited liquefaction, where sample exhibits a limited strain softening at the beginning of the test
The purpose of this study was to investigate the effect of initial confining pressure and geotextile reinforcement on the behaviour of sand
Summary
Chlef sand, which is widely distributed in the broad alluvial valley crossed by the Chlef River up to the zone of confluence of this river with the Fodda River, is generally medium soil in which more than 95% is particle size with some proportion of minerals as feldspar and quartz. It has suffered high risk environment, largely failure damage has been located after the last Chlef earthquake occurred on October 10, 1980 at 12 h 25 GMT. Only a few works to study the effect of reinforcement on Chlef sand have been reported in the literature, in this work, an experimental investigation on the behaviour of reinforced Chlef sand with geotextile is presented
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