Answered: The results of a laboratory…

The results of a laboratory consolidation test on a clay sample are given below: Pressure, P Void Ration, e (kN/m) 23.94 1.112 47.88 1.105 95.76 1.080 181.52 0.985 383.04 0.850 766.08 0.731

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 9.2P

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Question

Geotechnical

The results of a laboratory consolidation test on a clay sample are given below:
Pressure, P
Void Ration, e
(kN/m)
23.94
1.112
47.88
1.105
95.76
1.080
181.52
0.985
383.04
0.850
766.08
0.731
a) Draw an e-log p plot.
b) Determine the pre-consolidation pressure, p..
c) Find the compression index, C.

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An oedometer (consolidation) test is performed on a normally consolidated clay stratum that is 8.5 feet thick, and it found that the clay's initial voids ratio was e_0 = 0.8 and its primary compression index is C_c = 0.28. The in-situ stress at mid-clay layer is p_0 = 2, 650 psf, and the building exerts a pressure through its mat foundation of 970 psf. The secondary compression index C_ alpha = 0.02. The time of completion of the primary settlement is approximately 18 months. What is the total consolidation of the 8.5 foot clay stratum 5 years after the primary 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?
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.
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