2022 Volume 78 Issue 2 Pages I_577-I_582
Authors have been developing a countermeasure using shallow vertical drain (PVD) to prevent destruction owing to sand boils induced by liquefaction. This method aims to protect the ground surface from large deformation or unevenness induced by sand boils, in order to ensure the transportability of vehicle used for human rescue and post-earthquake recovery activities. In our previous studies, the application of the vertical drain (spacing of 1.2m; length of 3.0m) showed a sufficient effect on preventing sand boils caused by the upward propagation of pore water pressure. Since the vertical drain is only applied in the shallow soil layer in this method, in contrast to the conventional countermeasure against liquefaction, the less use of PVD would result in a lower construction cost. The effect of the method on reducing the ground surface deformation/unevenness by 90% has been demonstrated in this study.
