GATE Civil Engineering (CE) 2021 Shift 1 Solved Paper

The soil profile at a construction site is shown in the figure (not to scale). Ground water table (GWT) is at 5 m below the ground level at present. An old well data shows that the ground water table was as low as 10 m below the ground level in the past. Take unit weight of water, γ_w = 9.81 kN/m³ .

The overconsolidation ratio (OCR) (round off to two decimal places) at the mid - point of the clay layer is ________.