Soil drained BC

[hamadadf]

in all soil tutorials, to achieve a drained analysis, loads are applied at one step (using very short time and without releasing the pore pressure) , then during the next step pore pressure is identified to be zero and the consolidation behgaviour is monitored with time. My question is, would it be wrong for abaqus to identify pore pressure to be zero during the loading step , and in that case would the abaqus give correct results, or is it a must to not introduce pore pressure BC during loading to generate undrained pressure, then release it later?