Fig. 11

Time history of the vertical stress at a depth of \(y=\) 5.0 m for pure L-RK, sudden transition L–SL RK, and gradual transition L–SL RK cases; the sudden transition occurs at \(t=\) 0.05 s; the gradual transition occurs over 0.025 s < \(t\) < 0.05 s where the support sizes are linearly ramped over that period