Picos [204] incorrect solution, slow convergence when boundary and flow conditions are changed in PVD installed soil

I wanted to create a graph of excess pore pressure vs radial/horizontal distance for an MCC soil model at a particular depth installed with prefabricated vertical drains. To simulate the effect of smear, transition and undisturbed zones around the PVD, I constructed 3 soil volumes with 3 different permeabilities and a surcharge of 20kN/m2 was given using another soil volume extended to a height of 1m. When the default values of deformations and groundwater flow boundary conditions were used for the consolidation analysis, all the phases ran perfectly. But when I changed these conditions, since I needed the groundwater flow to take place through the drain alone and I needed to restrict the horizontal strain to zero, the phases failed and showed Picos [204]  incorrect solution, slow convergence. Can anyone help me to solve this?

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