Find the total stress ( σ ) , pore water pressure ( u ), and effective stress ( σ ′ ) at points A , B , C , and D . Plot the variation of stresses with depth.

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Q-1: A soil profile consisting of three layers is shown in the following figure. a) Calculate the values of o, u and o' at points A, B, C, and D Layer no. 1 2 3 ↑ H₁ H₂ H₂ Thickness H, = 2.1 m H₂ = 3.66 m H₂ = 1.83 m Dry sand Soll parameters Y₁ = 17.23 kN/m³ Ysat 18.96 kN/m³ Ysat 18.5 kN/m³ Sand Clay Rock Layer 1 Groundwater table Layer 2 Layer 3 ⒸDengage Learning 2014 b) Calculate the effective stress at c when water table drops by 2m (consider x 16.5 for layer 2). c) Calculate the effective stress at c when water table rises by 2m above layer 1 due to flooding (consider Ysa 18.5 for layer 1).

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Question

Chapter 8, Problem 8.7P

To determine

Find the total stress (σ), pore water pressure (u), and effective stress (σ′) at points A, B, C, and D.

Plot the variation of stresses with depth.

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Q-1: A soil profile consisting of three layers is shown in the following figure. a) Calculate the values of o, u and o' at points A, B, C, and D Layer no. 1 2 3 ↑ H₁ H₂ H₂ Thickness H, = 2.1 m H₂ = 3.66 m H₂ = 1.83 m Dry sand Soll parameters Y₁ = 17.23 kN/m³ Ysat 18.96 kN/m³ Ysat 18.5 kN/m³ Sand Clay Rock Layer 1 Groundwater table Layer 2 Layer 3 ⒸDengage Learning 2014 b) Calculate the effective stress at c when water table drops by 2m (consider x 16.5 for layer 2). c) Calculate the effective stress at c when water table rises by 2m above layer 1 due to flooding (consider Ysa 18.5 for layer 1).

Pressure (kN/m²)27 54 107 214 429 214 107 54 Void ratio1.243 1.217 1.144 1.068 0.994 1.001 1.012 1.024 The table above shows results obtained from an oedometer test on a specimen of saturated clay. A layer of this clay 2.5 m thick lies below a 10 m depth of sand, the water table being at the surface. The saturated weight for both soils is 19 kN/m³. A 10-m depth of fill of unit weight of 21 kN/m³ is placed on the sand over an extensive area. If the fill was to be removed some time after the completion of consolidation, what heave (mm) would eventually take place due to swelling of the clay? (0 d.p). Use unit weight of water of 9.8 kN/m3. Use log base 10.

A soil profile is shown in Figure 6.24. Calculate the values of o, u, and o at points A, B, C, and D. Plot the variation of ơ, u, and ơ with depth. We are given the values in the table. Layer No. Thickness (m) Unit weight (kN/m³) H = 2 H2 = 3 = 7 I Ydry = 15 Ysat = 17.8 II %3D III %3D Ysat = 18.6