A clay specimen was tested in a laboratory consolidation device, which was 25.4 mm (1 in.) thick and only the top boundary was drained. There was 90% consolidation time on the specimen obtained as 2.2 hours. Determine the following: (a) Time for 50% consolidation in the field with this soil with 9.6 m thickness where both top and bottom layers are drained (b) Time for 90% consolidation in the field with this soil with 9.6 m thickness where both top and bottom layers are drained © 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 ©, but at the end of 5 years

A clay specimen was tested in a laboratory consolidation device, which was 25.4 mm (1 in.) thick and only the top boundary was drained. There was 90% consolidation time on the specimen obtained as 2.2 hours. Determine the following: (a) Time for 50% consolidation in the field with this soil with 9.6 m thickness where both top and bottom layers are drained (b) Time for 90% consolidation in the field with this soil with 9.6 m thickness where both top and bottom layers are drained © 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 ©, 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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Similar questions

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 20 mm-thick sample in a singly drained laboratory consolidation test reaches 75% consolidation in 5 houres . How long will it take to reach 75% consolidation for a 5 m-thick clay sandwiched between two sand layers in the field ?
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.
Laboratory tests on a 25-mm-thick clay specimen drained at the top and bot-tom show that 50% consolidation takes place in 8.5 min.a. How long will it take for a similar clay layer in the field, 3.2 m thick anddrained at the top only, to undergo 50% consolidation?b. Find the time required for the clay layer in the field described in part (a)to reach 65% consolidation.
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.
A laboratory consolidation test on a 20 mm thick sample of soil shows that 90% consolidation occurs in 30 minutes. Plot a settlement (degree of consolidation) – time curve for a 10 m layer of this clay in the field for (a) single drainage, and (b) double drainage.
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?
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.
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
Laboratory tests on a 25mm thick clay specimen drained at both the top and bottom show that 50% consolidation takes place in 8.5 minutes. Find the time required for the clay layer in the field as described in How long will it take for a similar clay layer in the field, 3.2 m thick, but drained at the top and bottom, to undergo 50% consolidation, to reach a 65% consolidation.
Q#2: (a). What is consolidation? Explain the concept of NCR and OCR with examples in your own words. (b). The results of a consolidation test on an undisturbed soil sampled at a depth of 10m below the Ground level are as follows: ϒsat = 16KN/m3, Pre consolidation pressure =90 KPA, ϒw = 10KN/m3. Calculate the over consolidation of soil and Type of consolidation soil.
The following figure show the relationship between the voids ratio and effective stress for a soil sample collected from the mid depth of a 6 m thick clay layer. The Cc and Cr values have been determined to be 0.3 and 0.04 respectively. For the given information: If the current effective stress at the mid depth is 70 kPa, calculate the ultimate consolidation settlement when the effective stress at mid depth increases by 10 kPa due to an applied load. If the coefficient of consolidation is 0.555 m2/s and the clay layer is single drained, calculate the time taken to reach 45% consolidation.