A 3 m thick clay layer is subjected to an initial uniform pore pressure of 145 kPa as shown in the figure.SandClay-3.0 mm minTw90) = 0.85Mg = 145 kPaImpermeable StratumFor the given ground conditions, the time (in days, rounded to the nearest integer) required for 90% consolidation would be

Given- Thickness of clay layer H=3 m, Initial uniform pore pressure q=145 kPa, Coefficient of…

A 3 m thick clay layer is subjected to an initial uniform pore pressure of 145 kPa as shown in the figure. 3 m Sand Clay -3.0 m/min T-0.85 Mg-145 kPa Impermeable Strafam wwwwwwwwwww For the given ground conditions, the time (in days, rounded to the nearest integer) required for 90% consolidation would be

A 3 m thick clay layer is subjected to an initial uniform pore pressure of 145 kPa as shown in the figure. 3 m Sand Clay -3.0 m/min T-0.85 Mg-145 kPa Impermeable Strafam wwwwwwwwwww For the given ground conditions, the time (in days, rounded to the nearest integer) required for 90% consolidation would be

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.18P

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Similar questions

The layer is subjected to a uniform vertical stress increase of 100 kPa. The singly-drained clay layer has a coefficient of consolidation of 20 ft2 /yr. Determine the value of the excess pore pressure at point A 2 years after the application of the load. Also given is the chart giving the local degree of consolidation. a)4.4 kPa b)44 kPa c)88 kPa d)96 kPa
An oedometer test on a saturated clay soil gave the following results: Cc = 0.2 and Cs = 0.04. The in-situ vertical effective stress in the field is 130 kPa. A building foundation will increase the vertical stress in the center of the clay by 150 kPa. The thickness of the clay layer is 2 m and its water content is 28%. Calculate the primary consolidation settlement of the clay layer in the field if: a). OCR = 4.5; b). OCR = 1.5.
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;
For a laboratory consolidation test on a clay specimen (drained both sides), the following were obtained. Thickness of the clay layer = 25mm o_1 = 200KN/m^2 o'2 = 400KN/m^2 e_1 = 0.73 e_2 = 0.61 Time for 50% consolidation (t_50 = 2.8min: From table U = 50%, Tv = 0.197 %3D Determine the hydraulic conductivity (in cm/sec) of the clay for the loading range.
A saturated clay specimen is subjected to a pressure of 240 kN/m2. After the lapse of a time, it is determined that the pore pressure in the specimen is 72 kN/m2. What is the degree of consolidation? Show free body diagram. a.75% b.60% c.70% d.65%
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?
The water content of a sample of saturated soil at a mean effective stress of 10 kPa is 85%. The sample was isotropically consolidated with a mean effective stress of 150 kPa. At the end of the consolidation, the water content was 50%. The sample was then isotropically unloaded to a mean effective stress of 100 kPa, and the water content increased by 1%. Given: Gs = 2.7, o'cs = 25°. a) Calculate and K. 10 b) Determine the failure stresses (p'f and gf) under CU test and CD test for the conditions.
The laboratory consolidation data for an undisturbed clay specimen are as follows: e1 = 1.12 P₁ = 90 kPa e2 = 0.90 P2 = 450 kPa 1. Compute the value of the compression index. 2. Compute the value of the swell index assuming it is equal to 1/6 the value of the compression index. 3. Compute the void ratio for a pressure of 600 kPa. 4. Compute the coefficient of compressibility. 5. Compute the value of the coefficient of volume compressibility.
A fully saturated clay specimen is placed in a consolidometer and subjected to a loading of 200 kN/m². After some of time, it was found that the average pore pressure in the specimen was 70 kN/m². The percentage of consolidation reached by then was
Q.10 A soil stratum is 10 m thick with pervious stratum on top and bottom. The time required for 50% consolidation is (b) 426 days (d) 680 days (a) 360 days (c) 570 days Coefficient of permeability = 10-7 cm/s Coefficient of compression = 0.0003 cm²/gm Void ratio = 2 Time factor = 0.197
Find 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 60 230 480 930
1. 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.)