EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
9th Edition
ISBN: 8220103611718
Author: SOBHAN
Publisher: CENGAGE L
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Chapter 11, Problem 11.18P
(a)
To determine
Calculate the time taken to reach
(b)
To determine
Calculate the consolidation settlement at
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For a normally consolidated clay, the following are given:The hydraulic conductivity k of the clay for the preceding loading rangeis 1.8 104 ft/day.a. How long (in days) will it take for a 9 ft thick clay layer (drained on one side)in the field to reach 60% consolidation?b. What is the settlement at that time (that is, at 60% consolidation)?
Under normal loading condition, a 3.6-m thick clay (normally consolidated) has po = 190 kPa and eo = 1.22. A surcharge of 190 kPa reduces its void ratio to 0.91. The hydraulic conductivity of the clay for the loading range is 6.1 x 10-5 m/day.
a. What is the coefficient of volume compressibility of the clay?
b. What is the coefficient of consolidation of the clay?
c. How long will it take for this clay layer to reach 60% consolidation if it is drained on one side only?
Please answer this asap. For upvote. Thank you very much
For a laboratory consolidation
test on a clay specimen (drained
both sides), the following were
obtained.
Thickness of the clay layer =
25mm
o_1 = 200KN/m^2
o'2 = 400KN/m^2
e_1 = 0.73
e_2 = 0.61
Time for 50% consolidation (t_50
= 2.8min: From table U = 50%, Tv
= 0.197
%3D
Determine the hydraulic
conductivity (in cm/sec) of the
clay for the loading range.
Chapter 11 Solutions
EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
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- Show some solutionarrow_forwardAt 0.45 porosity the hydraulic conductivity of the sand is 0.010cm/sec.what is the hydraulic conductivity at n=0.50arrow_forwardb) For a normally consolidated laboratory clay specimen drained on both sides, the follow are given o'o =150 kN/m², e = eo = 1.1 •o'o+ Ao = 300 kN/m², e = 0.9 The thickness of clay specimen = 25mm Time for 50% consolidation = 2mm a) Determine the hydraulic conductivity of the clay for the loading range. %3D CR[5] b) How long (in days) will it take for a 1.8m clay layer in the field (drained on one side) to reach 60% consolidation.arrow_forward
- A sand has Gs = 2.66. Calculate the hydraulic gradient that will cause boiling for e = 0.35, 0.45, 0.55, 0.7, and 0.8.arrow_forwardFor a normally consolidated laboratory clay specimen drained on both sides, the following are given: σ0’ = 4000 ib/ft² e=1.2 σ0’ + Δσ’= 5000 lb/ft² e=0.9 Thickness of clay specimen= 2in Time for 50% consolidation= 2 min. Determine the hydraulic conductivity (ft/min) of the clay for the loading range. How long (in days) will it take for a 6-ft clay layer in the field(drained on both side) To reach 60% consolidation?arrow_forwardThe hydraulic conductivity of a sand at a void ratio of 0.750 is 0.047 cm/s. Estimate the coefficient of permeability at a void ratio of 0.450 1. Using Casagrande equation 2. Using Kozeny-Carman equationarrow_forward
- 1. Under normal loading condition, a 3.6 m thick clay (normally consolidated) has P, = 190 KPa and e, =1.22. A surcharge of 190 KPa reduces its void ratio to 0.98. The hydraulic conductivity of the clay for the loading range is 6.1 x 10ʻ m/day. a. What is the coefficient of volume compressibility of the clay? b. What is the coefficient of consolidation of the clay? c. How long will it take for this clay layer to reach 60% consolidation if it is drained on one side only?arrow_forwardbe the hydraulic conductivity at 20°C? Ans. 1.0 x 10 cm/sec 4. For a normally consolidated clay, the following values are given. k(cm/sec) 0.45 x 10 e 0.78 1.1 0.88 x 10 Estimate k at a void ratio of 0.97 6.0089 107arrow_forwardIf the hydraulic conductivity of a sand at a void ratio of o.6 is o.03 cm/s, its value at the void ratio of o.75 will be O a. 0.03 O b. 0.05 O C. 0.07 O d. none of the above Hide Feedback Incorrectarrow_forward
- 4- A 22 ft clay layer in the field (drained on one side) is normally consolidated. When the pressure is increased from 1,000 lb/f? to 3,000o 1b/ft?, the void ratio decreases from 0.9 to 0.75. The hydraulic conductivity, k, of the clay for the above loading range was found to be 2.4 x 10 in'sec. a) How long (in days) will it take for the clay layer to reach 50% consolidation? b) What is the settlement at that time (that is, at 50% consolidation)?arrow_forward11.15 For a normally consolidated σ = 2 ton/ft² • σ + A' = 4 ton/ft²2 • e = 0.96 The hydraulic conductivity k of the clay for the preceding loading range is 1.8 x 10 ft/day. • clay, the following are given: • e = e = 1.21 a. How long (in days) will it take for a 9 ft thick clay layer (drained on one side) in the field to reach 60% consolidation? b. What is the settlement at that time (that is, at 60% consolidation)?arrow_forwardThe coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/s. Estimate the coefficient of permeability at a void ratio of 0.48 using Casagrande equation.arrow_forward
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