A clay specimen was tested in a laboratory consolidation device, which was 12.7 mm (½ in.) thick and the top and the bottom boundaries were drained. A 50% consolidation time on the specimen was obtained as 28.4 minutes. Determine the following: (a) Time for 50% consolidation in the field with this soil with a 2.5 m thickness where only the top layer is drained (b) Time for 90% consolidation in the field with this soil with a 2.5 m 9.4 thickness where only the top layer is drained (c) For the same field condition above, at the end of 1 year after the placement of load, how much primary consolidation settlement occurs relative to its final amount of the settlement? (d) The same question as in (c), but at the end of 5 years

A clay specimen was tested in a laboratory consolidation device, which was 12.7 mm (½ in.) thick and the top and the bottom boundaries were drained. A 50% consolidation time on the specimen was obtained as 28.4 minutes. Determine the following: (a) Time for 50% consolidation in the field with this soil with a 2.5 m thickness where only the top layer is drained (b) Time for 90% consolidation in the field with this soil with a 2.5 m 9.4 thickness where only the top layer is drained (c) For the same field condition above, at the end of 1 year after the placement of load, how much primary consolidation settlement occurs relative to its final amount of the settlement? (d) The same question as in (c), but at the end of 5 years

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.5P

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Q1: A clay specimen was tested in a laboratory consolidation device, which was 12.7 mm thick and the top & bottom boundaries were drained. A 50% consolidation time on the specimen was obtained as 28.4 minutes, Determine the Following: a- The time for 50% consolidation in the field with a 2.5 m thickness where ‘only the top layer is drained. b- The time for 90% consolidation in the field with a 2.5 m thickness where only the top layer is drained. c- For the same field condition above, find the settlement after 1year, if the final consolidation settlement = 0.0345 m.
A 3-m thick layer of saturated clay (two-way drainage) under a surcharge loadingunderwent 90% primary consolidation in 100 days. The laboratory test’s specimenwill have two-way drainage.a. Find the coefficient of consolidation of clay for the pressure range. b. For a 25 mm. thick undisturbed clay specimen, how long will it take to under-go 80% consolidation in the laboratory for a similar pressure range?
ANSWER MUST BE: (a) t50 = 8.37 years, (b) t90 = 35.96 years, (c) U ≈ 17%, (d) U ≈ 39% A clay specimen was tested in a laboratory consolidation device, whichwas 12.7 mm (½ in.) thick and the top and the bottom boundaries weredrained. A 50% consolidation time on the specimen was obtained as28.4 minutes. Determine the following:(a) Time for 50% consolidation in the field with this soil with a 2.5 mthickness where only the top layer is drained (b) Time for 90% consolidation in the field with this soil with a 2.5 mthickness where only the top layer is drained (c) For the same field condition above, at the end of 1 year after theplacement of load, how much primary consolidation settlementoccurs relative to its final amount of the settlement? (d) The same question as in (c), but at the end of 5 years
In an Oedometer test, the void ratio of a clay decreased from 0.652 to 0.51 under change in effective pressure from 60 KPa to 130 KPa. Under two-way drainage (for the same test) it was found that the required time to achieve 50% tso consolidation was 12 mins with the sample of thickness 12mm. Find the coefficient of permeability of the clay for the given stress range. No wrong answers please i will downvote and box the final answer
An odometer test is carried out on a sample of clay 20 mm thick assumed to be fully saturated. The time to reach 90 percent consolidation is 10.5 min. Estimate the following: (a) Time to reach 50 percent consolidation in odometer test (b) Time for a 9-m-thick layer of this clay to reach 90 percent consolidation assuming the same drainage conditions apply and it is subject to the same load increment as in the odometer test.
In a consolidated drained tri-axial text on a normally consolidated clay soil, a deviator of 152 kPa was required to fail the sample when the confining pressure was 70 kPa. A. What was the angle of shearing resistance? B. Suppose that after consolidation under the 70 kPa confining pressure, the sample is placed in an unconfined compression apparatus and tested. Determine the resulting shear strength.
A one-dimensional consolidation test was performed on a sample, 0.75-inch high, taken from a field clay layer. During the test, drainage was allowed at the upper and lower boundaries. It took the lab sample 15 minutes to reach 50% consolidation. If the clay layer in the field has the same drainage condition as the lab sample, calculate how many days it will require the 10 feet clay layer to achieve 50% and 90% consolidation.
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?
A clay specimen was tested in the laboratory consolidation device, which had 25.4 mm (1 inch) thick and only the top boundary was drained. 90 % consolidation time on the specimen was obtained as 2.2 hours. Determine: a) Time for 50 % consolidation in the field of this soil with 9.6 m thick with both top and bottom layers are drained.b) Time for 90 % consolidation in the field of this soil with 9.6 m thick with both top and bottom layers are drained.c) For the same field condition above, at end of one year after the placement of load, how much primary consolidation settlement occurs relative to its final amount of the settlement?d) The same question in (c), but at the end of five years.
For 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 compressibility in m2/kN. a.2.56 x 10^-2 b.1.081 x 10^-3 c.1.23 x10 ^-5 d.1.31 x 10^-7
A clay sample underwent a consolidation test in the lab. The clay specimen has drainage on both sides and a height of 25.4 mm. Assume that the clay sample's preconsolidation pressure was less than 150 kPa prior to the consolidation test. The void ratio was 0.96 when the applied effective vertical pressure was 150 kPa. When the vertical effective pressure increased from 150 to 220 kPa, the void ratio at the end of consolidation and compression was 0.88. It was discovered that the sample needed 3 minutes to consolidate by 30%. Following the consolidation test, a swelling/unloading test was conducted, in which the vertical effective stress was lowered from 220 to 150 kPa and the end-of-swelling void ratio was determined to be 0.9. Required a. The compression index of the clay b. The swelling index of the clay C. The height of the clay sample at the end of compression d. The coefficient of consolidation of the clay e. The final height of the clay sample at the end of swelling
A 3.2 m thick layer of saturated clay under a surcharge loading underwent 90% primary consolidation in 80 days with double drainage. 1.Determine the coefficient of consolidation for the pressure range. 2.For a 10 cm thick specimen of the said clay, how long will it take to undergo 90% consolidation in the laboratory for a similar pressure range?