2020 Volume 8 Issue 12 Pages 476-479
Studies in the past showed that the laboratory tests on dense sand specimens obtained by the conventional tube sampling method may exhibit lower liquefaction resistance than the field strength observed in situ. This phenomenon would result in excessive over-design of important infrastructures on such dense sandy ground. Therefore, in this study, a series of cyclic undrained hollow cylindrical torsional shear tests were conducted on sand specimens that were prepared by air-pluviation method with high initial relative density (around 80%), with several attempts to reach high liquefaction resistance. During these torsional shear tests, different kinds of pre-shear histories were applied before cyclic loading. The test results showed that specimens with pre-shear using small strain amplitude could exhibit significantly high liquefaction resistance, as compared to the one without the pre-shear.
