Experimental and numerical studies of the liquefaction resistance of a sand reinforced

摘要

On sites with a high liquefaction potential, the installation of a network of textilestrips arranged in a similar manner to and using the same technique as vertical drains could proveto be an efficient method for combating soil liquefaction in the event of an earthquake. It is thereforeimportant to examine the dynamic behaviour of soils reinforced with geosynthetics. This articlepresents various tests using a cyclic triaxial instrument, on specimens of saturated Hostun RFsand, reinforced with circular sheets of geosynthetic material. After giving a summary of the resultsobtained with different types of geosynthetics, of different rigidity, compressibility and roughnesscharacteristics, the author analyses in more detail the role of non-woven geotextile inclusions. Theundrained behaviour of saturated Hostun RF sand reinforced with non-woven geotextiles is analysedon the basis of different test series. This article shows the effect of the state of stress at thesoil geotextile interface. This analysis highlights the influence of reinforcement compressibility oninterstitial pressure distribution in the specimen, thus showing the role of this type of inclusion inthe increase in liquefaction resistance. Drainage assessment of an in situ textile in the event of anearthquake is presented.