Effect of decreasing the pore fluid bulk modulus K (= K _w/n) on the estimated acceleration time history at a depth of 2 m and comparison with pertinent data (accelerometer 8 in Figure 10) from the centrifuge test on stabilised sand (data from Gallagher et al. (2007b)) for (a) n = 50, (b) n = 500, (c) n = 1000 and (d) n → ∞ (simulating fully drained conditions)