Information for a soil profile is presented in following table:   Depth (m) Density (kg/m3) Wet Density (kg/m3) Sand 5 1600 1900 Silty Clay 5 1050 1750 Water Table 2m Below the surface What were the total and effective stresses at each layer boundary?

Question 3 Consider a soil element which was originally embedded at a depth of 10 m below ground. The effective unit weight of the soil is 20 kN/m³, whilst the water table is far below the ground surface. The ground was subjected to weathering and erosion over the past 1 million years. The soil element is currently overlying by 2 m of soil only. Calculate the current over-consolidation ratio (OCR) of the soil element. The soil element was used to carry out a drained direct shear box test. The direct shear box apparatus had a plan area of 0.1m x 0.1m. A vertical load of 100 kg was subsequently applied to the soil. The critical state shear force was measured as 560 N. Calculate the critical state friction angle of the soil element. If the soil element is taken to carry out a drained direct shear box test at a mean confining stress of 20 kPa, calculate the OCR and critical state shear strength. If the soil element is taken to carry out a drained direct shear box test at a mean confining…

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Q2. A soil profile consisting of three layers is shown in Figure 1 below. Unit weight of water (yw) = 9.81 kN/m³ Layer no. 1 2 3 ↑ H₁ H₂ Dry sand Sand Clay Rock Figure 1: Soil Profile Thickness H₁ = 1.5 m H₂ = 2.53 m H3 = 2.64 m Layer 1 Groundwater table Layer 2 Layer 3 Soil parameters Yd = 16.5 kN/m³, Ysat = 17.42 kN/m³ Ya = 16.5 kN/m³, Ysat = 18.55 kN/m³ Yd = 17.50 kN/m³, Ysat = 19.23 kN/m³ a) Calculate the values of o, u and o' at points A, B, C and D. b) Calculate the effective stress at C when water table drops by 2 m. c) Calculate the effective stress at C when water table rises by 1 m above layer 1 due to flooding.