7. Figure 6 shows a clay layer of thickness 2H = 8m contained between two sand layers and subjected to a uniform stress o* = 100 kN / m² . %3D 100 kN/m² 6m" Sand: 's =18 kN/m³ 8 m Clay : 's = 20 kN/m³ Sand: s = 19 kN/m³ Figure 6. Axial stress state in one-dimensional soil consolidation (i) If the clay layer is Normally Consolidated, with Cc =0.01, calculate the consolidation settlement by considering the effective stress changes at the center of the clay layer. (ii) Calculate the time required for 90% of this consolidation settlement, given C, = 4× 10-' m² / sec and Too = 0.848

7. Figure 6 shows a clay layer of thickness 2H = 8m contained between two sand layers and subjected to a uniform stress o* = 100 kN / m² . %3D 100 kN/m² 6m" Sand: 's =18 kN/m³ 8 m Clay : 's = 20 kN/m³ Sand: s = 19 kN/m³ Figure 6. Axial stress state in one-dimensional soil consolidation (i) If the clay layer is Normally Consolidated, with Cc =0.01, calculate the consolidation settlement by considering the effective stress changes at the center of the clay layer. (ii) Calculate the time required for 90% of this consolidation settlement, given C, = 4× 10-' m² / sec and Too = 0.848

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.15P

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2) A soil profile consisting of three layers is shown in the Figure. A) Calculate the values of σ, u and σ' at points A,B,C and D if Layer 1: H1=5m, e=0.7, Gs=2.69 Layer 2: H2=8m, e=0.55, Gs=2.7 Layer 3: H3=3m, w=38%, e=1.2 B) What is the change in effective stress at point C if: If the water table drops by 2m? If the water table rises to the surface up to point A? Water level rises 3 m above point A due to flooding?
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