ANALYSIS AND CENTRIFUGE EXPERIMENT ON THE APPLICATION OF SHALLOW VERTICAL DRAIN TO PREVENT SAND BOILS INDUCED BY LIQUEFACTION

Abstract

 Authors are developing a countermeasure to prevent the destruction of sand boil induced by liquefaction by using shallow vertical drain (PVD). Along with the 1G model test in previous study, a seepage analysis and centrifuge model tests are conducted to establish a design method considering real application in this study. With the PVD spacing of 1.2 m and length of 3 m, the transmission of liquefaction to ground surface is prevented while allowing liquefaction to occur in deeper portion. Consequently, sand boil and its destruction are also prevented by the use of PVD. In comparison to the current application of PVD on preventing liquefaction, a much-lower construction cost is expected with the less use of PVD.