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Despite extensive amount of research on cyclic response of sands, re-liquefaction behavior and cyclic liquefaction resistance of cohesionless soils under a repeated cyclic load have not received the same amount of attention. This is important as most soil deposits in high seismic areas have been subjected to repeated number of earthquakes. This paper presents series of laboratory cyclic simple shear tests on specimens of a local sand. Sand specimens are reconstituted at relative densities of 25%, 45%, and 65% and subjected to effective vertical stresses of 50, 100, 200, 400, and 600 kPa. Reconstituted samples are subjected to two consecutive cyclic loads and sand behavior and liquefaction resistance are examined and compared following both cyclic loads. Re-liquefaction is simulated by unloading the specimens after the first cyclic load and re-consolidating the specimen under the same initial vertical stress. A similar cyclic load is then re-applied on the sand specimen. The results show a moderate increase in relative density after re-consolidation, which is greater for loose sand specimens. However, a complicated change in cyclic liquefaction resistance is observed for loose and dense specimens which also varies with stress level. Despite the larger increase in relative density, the loose specimens exhibit a decrease in cyclic resistance following the first cyclic load. The reduction in cyclic resistance increases with decreasing effective stress (from 600 to 50 kPa). On the other hand, dense samples experience an increase in cyclic resistance, particularly at higher stress levels.
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