A 3 m thick clay layer is subjected to aninitial uniform pore pressure of 145 kPaas shown in the figure.3 mSandClaye-3.0 mm²/minTw(90) = 0.85Mo - 145 kPaImpermeable StratumFor the given ground conditions, the time(in days, rounded to the nearest integer)required for 90% consolidation would be

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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 e-3.0 mm²/min Tu(90) = 0.85 Mo - 145 kPa Impermeable Stratum 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 e-3.0 mm²/min Tu(90) = 0.85 Mo - 145 kPa Impermeable Stratum For the given ground conditions, the time (in days, rounded to the nearest integer) required for 90% consolidation would be

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

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For a normally consolidated clay layer in the field, the following values are given:Thickness of clay layer = 8.5 ftVoid ratio ?? = 0.8Compression index ?? = 0.28Average effective pressure on the clay layer ??′ = 2650 lb ft2 ⁄∆?′ = 970 lb ft2 ⁄Secondary compression index ?? = 0.02What is the total consolidation settlement of the clay layer five years after the completionof primary consolidation settlement? (Note: Time for completion of primary settlement= 1.5 years.)
Due to a certain loading condition, the initial excess pore water pressure distribution in a 4m thick clay layer is shown in figure p6.2. Given that Cv=0.3mm2/s, determine the degree of consolidation after 100 days of load applications.
coefficient of consolidation of 20 ft2 /yr is given for the singly-drained clay layer. This layer is subjected to a uniform vertical stress increase of 100 kPa.2 years after the application of the load what will be the value of the excess pore pressure at point A . chart giving the local degree of consolidation.
Q 8.7 If the coefficient of consolidation for the clay layer in problem 8.3 is 0.0018 cm^2/Sec, how long will it take for 60% primary consolidation to take place? What will be the total compression due to consolidation at that time?
Compute the settlement of the clay layer caused by primary consolidation if the pre consolidation pressure of the clay is 96kPa. use approximate method for average vertical stress.
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A pressure increase of 250 kPa is imposed across a wide region above the depicted soil profile. The clay stratum is initially under normal consolidation and has a coefficient of consolidation (cv) of 0.002 cm2/s. The groundwater level sits 3.5 meters beneath the soil surface. Determine the settlement of the clay layer, in millimeters, 40 days following the application of the pressure increase. noted that The final settlement at the end of primary consolidation is equal to 515 mm.
A saturated clay layer (300cm in thickness) was sitting upon the rock, its unit weight was = 20kN/m3, an oedometer test also found that Cc = 0.2, Cr = 0.04. The existing vertical effective stressin the field is 200 kPa. Construction will increase the vertical stress at the centre of the clay by = 600 kPa.a) Calculate the primary consolidation settlement of clay layer if it has been subjected toa load at OCR = 2.b) Assume spatial variation of pore pressure u with time t and depth z is onedimensional,and governed by:where Cv is a given constant, specify its boundary and initial condition, and try toillustrate the pore pressure change with time along its depth.
A singly drained clay deposit 10 meters thick has a coefficient of consolidation of 2.0 x 10-4 cm2 / s. A settlement analysis based on consolidation tests predicted an ultimate consolidation settlement under the applied load in the field to be 0.95 meters. a) How long would it take, in years, for a settlement of 35 cm to occur? b) How much settlement, in millimeters, would you expect to occur in 5 years?
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