A 6-m deep layer of sand overlies a 4m thick clay layer. The clay layer is under

Question

A 6-m deep layer of sand overlies a 4m thick clay layer. The clay layer is underlain by sandy gravel. The water table is at the ground surface and the saturated unit weight for both the sand and the clay is 19 kN/m^3. A 3-m thick layer of fill (unit weight 20 kN/m^3) is to be placed rapidly on the surface over an extensive area. Assume that the data given in Problem 1 corresponds to that of a representative sample from the clay, whose coefficient of consolidation is 2.4 m^2/year. Calculate the total and effective vertical stresses and the pore water pressure at the centre of the clay layer before the fill is placed, immediately after the fill is placed, and after the clay has consolidated under the vertical stress increment due to the fill. Without subdividing the clay layer, calculate the final consolidation settlement due to the placement of the fill using Delta H / H0 = Delta e / 1 + e0: coefficient of volume compressibility; compression index. What is the degree of consolidation Uz at the centre of the clay layer when the pore water pressure at that depth is equal to 125 kN/m^2? What is the effective stress at that depth at that time? how long will it take to reach 50 % average degree of consolidation U? What is the settlement at the end of 20 months? What time is required for 40 mm settlement?

Explanation / Answer

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.