GATE 2023 Soil Mechanics & Foundation Engineering Quiz 63

Find the effective stress at a depth of 9 m below ground level for the sub-soil condition shown on the figure below.

Effective stresses on soil

Calculate the effective stress at a depth of 3m for the sub-soil condition shown below.

Water is flowing at the rate of 0.05 cm³/sec. in upward direction through a fine sand sample whose K = 2 × 10^–3 cm/sec. The thickness of sample is 12 cm and area of cross-section is 50 cm². Find the effective pressure (in kN/m²) at middle section of sample. Take γ_sat. = 19.4 kN/m³ and γ_w = 10 kN/m³.

A 6m thick clay layer lies between two layers of sand each of 3m thick, the top layer being at ground level. The water table is 1.5m below the ground level but the lower layer of sand is under artesian pressure. The Piezometric surface being 2m above ground level. The saturated unit weight of clay is 20 kN/m³ and the sand is 19 kN/m³. Above the water table the unit weight of sandy soil 17 kN/m³. Calculate the effective stress just below the clay layer (in kN/m², up two decimal places)

A sand layer is placed in a ground under the ground conditions as follows:

Then,