ABSTRACT
Presented in this paper is investigation of the efficiency of installing new type of vertical drains on dissipation of pore water pressure as a remedial measure against liquefaction. A series of shaking table tests of two-layer ground model with and without drains were performed at the University of Tokyo. Reduced scale models were subjected to cyclic loading at different acceleration levels. Also gravel drains were installed in ground model in order to compare the efficiency with artificial type of drain.
The results from this experimental study show the following:
efficiency of vertical drains both, artificial and gravel, on dissipation of pore water pressure at different acceleration levels;
optimal spacing between drains to keep the pore pressure ratio σ′/u as low as possible;
shortening of time necessary for dissipation of excess pore pressure when vertical drains are installed.
