Updated: Question in GATE 2012 Civil Engineering Paper with Solution

A question in GATE 2012 Civil Engineering Paper with Solution has been updated:

A layer of normally consolidated, saturated silty clay of 1 m thickness is subjected to one-dimensional consolidation under a pressure increment of 20kPa. The properties of the soil are: specific gravity = 2.7, natural moisture content = 45%, compression index = 0.45, and recompression index = 0.05. The initial average effective stress within the layer is 100 kPa. Assuming Terzaghi’s theory to be applicable, the primary consolidation settlement (rounded off to the nearest mm) is

1. 14 mm
2. 9 mm
3. 16 mm
4. 2 mm