In PLAXIS V20,V21 and V22 there is included PVD drain. But How can I simulate Stone column in PLAXIS 2D v21 ?

Hi, I am getting very high excess pore pressures at particular nodes beneath the pile cap, adjacent to the embedded beams as shown below,. This is causing very slow convergence and excess pwp is not changing after particular point. (fig 1 - phase before…