EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
9th Edition
ISBN: 8220103611718
Author: SOBHAN
Publisher: CENGAGE L
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Chapter 11, Problem 11.9P
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?
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;
Solutions pls
Chapter 11 Solutions
EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
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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
- Estimate the primary consolidation settlement in the clay layer. Given by the figure belowarrow_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_forwardThe following are the results of a consolidation test on a sample of a clayey soil. • Plot the e-log o curve. • Determine the pre-consolidation pressure. • Calculate the compression index, Ce and the ratio of C; /Ce. Pressure, o' (kN/m?) 1.113 25 1.106 50 1.066 100 0.982 200 0.855 400 0.735 800 0.63 1600 0.66 800 0.675 400 0.685 200arrow_forward
- Refer 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_forwardFor a normally consolidated soil, the following is given: Determine the following: a. The compression index, Cc. b. The void ratio corresponding to pressure of 200 kN/m2arrow_forwardWhen a clay's effective stress is increased by 12,000 kg/m², the change in the void ratio is 0.20. If the clay is 5 m thick and has an initial void ratio is 0.40... Q: What is the consolidation of the soil in cm? Round off your answer to the nearest multiple of ten.arrow_forward
- x in red is equal to 39arrow_forward11.6 and 11.7arrow_forward4. Figure Q4 shows a soil profile loaded with a uniformly distributed load, Ao=50kPa. The water table is located 2.5m below ground level and the soil above can be considered to be completely dry. The unit weight of the soil in each layer is given in the figure. Assume a unit weight for water, ywater=10KN/m. Results from an oedometer test carried out on a clay sample provide the following consolidation parameters: Preconsolidation stress, o'p=125kPa Recompression index, C,=-0.06 Compression index, Cc=-0.36 Initial void ratio, eo=0.9 Determine the consolidation settlement at the middle of e clay layer Aa'=50kPa dry sand Yary=16.5kN/m 2.5m saturated sand Ysat =18.8kN/m 4.5m saturated clay yat 19.2kN/m' e,=0.9 o =125kPa 5.0m Figure Q4arrow_forward
- Please answer part 2 and refer to 12.6 for it. figure is attachedarrow_forwardAs indicated in the following figure, an incompressible silty sand fill 16.4 ft thick was placed on top of a 49.2 ft thick layer of soft and compressible silty clay. Underlying the clay is a layer of incompressible sandy gravel. The soil properties of the silty clay layer are given in the following figure. The ultimate settlement, Sult = 5.64 ft, from the primary consolidation of silty clay layer due to the weight of the silty sand fill is calculated. O ft Fill Material - Silty Sand (SM), y = 124.86 pcf, 16.4 ft Silty Clay (CL) 94.89 pcf Y = Normally Consolidated 1.1 e, = Cc = 0.36 0.06 Cv = 9.235 ft/year 65.6 ft Dense Sandy Gravel (GP), Incompressible layer 82.0 ft A) Find the time rate of settlement by showing the Time [year] vs. Settlement [ft] curve. Show sample calculation when percentage of consolidation, Ugyg = 50%arrow_forwardFor a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the coefficient of consolidation in m2/m. Show free body diagram a.1.081 x 10^-3 b.1.23 x10 ^-5 c.1.31 x 10^-7 d.2.56 x 10^-2arrow_forward
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