Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 9, Problem 9.5P
To determine
Calculate the primary consolidation settlement of the clay layer.
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In a normally consolidated clay specimen, the following
data are given from the laboratory consolidation test.
e₁ = 1.10
σ= 65.0 kN/m²
€₂ = 0.85
o₂ = 240.0 kN/m²
a. Find the compression index C.
b. What will be the void ratio when the next pressure incre-
ment raises the pressure to 460.0 kN/m²?
x in red is equal to 39
Refer to the soil profile shown in figure below. A laboratory consolidation test on the clay gave
the results:
o'c = 100 kPa
Cc = 0.4
Cs = 0.2Cc
If the average effective stress on the clay layer increases by 60 kN/m², what would be the total
consolidation settlement in cm.
Dry sand; e = 0.55 G,= 2.66:
Sand G₂ = 2.66 e = 0.48.
Clay w 34.78% G₂ = 2.74
Rock
1.5 m.
5 m
Water table;
Chapter 9 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- A given saturated clay is known to have effective strength parameters of c' = 10 kPa and = 28°. A sample of this clay was brought to failure quickly so that no dissipation of the pore water pressures %3D could occur. At failure it was known that o KPa, o = 10 KPa and = 20 kPa. %3D (a) Estimate the values of o, and oz at failure (b) Use the Mohr circle to illustrate the effective stress and total failure stress.arrow_forward2.9 A normally consolidated clay has the following values. Void ratio, e k (cm/sec) 0.2 × 10 0.91 x 10-6 1.2 1.9 Estimate the magnitude of k of the clay at a void ratio (e) of 0,9. Use Eq. (2,41).arrow_forwardRefer to the soil profile shown in Figure P2.12. The clay is normally consolidated. A laboratory consolidation test on the clay gave the results: If the average effective stress on the clay layer increase by 50 kN/m2.a. What would be the total consolidation settlement?b. If Cv = 9.36 x 10-4 cm2/sec, how long will it take for half the consolidation settlement to take place?arrow_forward
- Question attachedarrow_forwardFind the C, and the "apparent" OCR for a superficial clay stratum that is 4m thick. The water is at the surface. A sample of the clay has a water content of 27.9%, and a specific gravity of 2.65. An oedometer test showed the following results: Voids Ratio 0.736 0.733 0.73 0.675 0.638 0.6 Vertical Effective Stress 15 28 60 230 480 930arrow_forwardSolve the following problems using the figure. 1. Calculate the ultimate settlement of the clay layer. 2. Calculate the excess pore pressure (ue) and the effective stress at the midpoint of the clay layer after 3 years. 10' Fill, y = 118b/³ Sand, y 109 lb/ft³ Sand, Ysat 114 lb/ft³ eo = 1.1 Cc = 0.25 C₁ = 7 ft²/yr C₁ = 0.06 clay 14' N.C Ysat = 122 lb/ft³ sand 8. For the previous problem, report the predicted settlement after 365 days. 3. Create a plot (or plots) in a spreadsheet showing the hydrostatic pressure in the clay with depth and the excess pore pressure (ue) with depth after 3 years and the combined pore pressure after 3 years. (This is similar to an example worked in class) 4. Calculate the average percentage of consolidation (U%) for the clay layer after 3 years. 5. How long will it take for 80% of the ultimate settlement of the clay layer to take place? 6. Assume thin layers of drainable sand are present every two feet within the clay so it is actually five clay layers that…arrow_forward
- A 6 foot thick clay layer is determined to have the consolidation properties shown below. If the average in-situ stress is 500 psf and the preconsolidation stress is 1,000 psf, what is the settlement for this overconsolidated soil subjected to a stress increase of 2,000 psf.arrow_forwardAnswer pleasearrow_forwardThe following data are given for normally consolidated clay: Thickness=2.6m Primary Cc=0.3 Secondary Cc=0.02 e=0.8 Average Pressure=127 kPa Change in pressure (vertical) =46 kPa Determine the following 1. Primary Consolidation Settlement (Ans. 58.17mm) 2. Secondary Settlement five years after the completion of the primary settlement. The time for completion of primary settlement is 1.5 years. (Ans. 15.4mm)arrow_forward
- Estimate the primary consolidation settlement in the clay layer. Given by the figure belowarrow_forward1. The pressure versus void ratio data determined from a consolidation test on an undisturbed clay specimen are as follows: Applied Pressure (kPa) 20 40 80 160 320 640 1280 320 80 20 0 Void Ratio 0.953 0.948 0.938 0.920 0.878 0.789 0.691 0.719 0.754 0.791 0.890 (a) Plot this pressure versus void ratio data on a semi-logarithmic graph. (b) Determine the equations for the virgin compression curve and for the rebound curve for unloading starting at 1,280 kPa. (c) What are the corresponding compression and recompression indices for this soil? (d) Estimate the stress to which this clay has been preconsolidated. (After A. Casagrande.)arrow_forward7.14 For a normally consolidated clay, the following values are given: Void ratio, e k (cm/sec) 0.95 0.2 x 10-6 0.91 x 10-6 1.6 Estimate k at a void ratio of 1.1. Use Eq. (7.38). Ⓒ Cengage Learning 2014arrow_forward
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