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

Question

7. Figure 2 shows the Total Stress and Effective Stress Diagram of a soil profile Effective Stress (kN/m²) Total Stress (kN/m²) 100 100 Depth (m) 1 2 7 8 9 10 50 42 56 86 150 200 Depth (m) 1 2 3 4 7 8 9 10 50 42 56 66 94 150 200 154 Figure 2. Total stress and effective stress diagram a. Based on the diagram, what is the elevation of the groundwater table? b. If the unit weight of water is 10 kN/m^3, what is the unit weight of the saturated layer between 4 and 6 m deep? c. What are the impacts of rising and falling groundwater levels? Explain your answer and give some examples.

Answer 1

Question

Chapter 9, Problem 9.5P

a)

To determine

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

b)

To determine

Find the rise of water table to increase the effective stress at point C is equal to 111 kN/m2

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