In a field with a 5.5 m thick clay layer with a top and bottom drained condition, a field preloading test was performed. From the observed settlement curve, 20% consolidation has been achieved in 2.5 months. A nearby site with similar soil has a 7.0 m thick clay layer. Estimate the following: (a) Time for 50% consolidation of 7.0 m thick clay layer (b) Time for 90% consolidation of 7.0 m thick clay layer 9.6

In a field with a 5.5 m thick clay layer with a top and bottom drained condition, a field preloading test was performed. From the observed settlement curve, 20% consolidation has been achieved in 2.5 months. A nearby site with similar soil has a 7.0 m thick clay layer. Estimate the following: (a) Time for 50% consolidation of 7.0 m thick clay layer (b) Time for 90% consolidation of 7.0 m thick clay layer 9.6

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.17P

See similar textbooks

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.
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 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?
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 ?
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.
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 3 m thick stratum (drained in two directions) of saturated Clay and under overburden, exhibited 90% primary consolidation in 75 days. Find the coefficient of consolidation of the clay for the pressure range. a) Take a 30 mm thick specimen, how long will it take for it to show 80% consolidation in the laboratory for a similar length of pressure, consider a two-way drain? b) If the specimen is 25 mm, time to reach 60% consolidation, with drainage in one direction?
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?
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.
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. Solve only part B
A clay specimen with an initial height of 22 mm has been tested in an oedometer in the lab, allowing double-way drainage to occur. The clay specimen reached 80% of final consolidation after 25 min. How long would it take in days for the same clay with a thickness of 8 m in the field to reach 80% of its final consolidation if there are three permeable levels of sand, one sand layer overlying the clay, a second thin sand layer in the middle of the clay, and a third sand layer immediately below the clay? (Acceptable tolerance = 2%)
Laboratory test on a 35 mm thick clay specimen drained just at the top show that 60% consolidation takes place 9.5 minutes. a) How long will it take for a similar clay layer in the field, 3,6 m thick, but drained at both the top and bottom, to undergo 60% consolidation? b) Find the time required for the clay layer in the field as described in part (a) above to reach 70% consolidation,