For a laboratory consolidation test on a clay specimen (drained on both sides), the following results were obtained. (7.5) Thickness of the clay layer = 25 mm P1= 100 kN/m2 e1= 0.81 P2= 200 kN/m2 e2= 0.73 Time for consolidation (t50) = 3.4 min Determine the hydraulic conductivity of the clay for the loading range

For a laboratory consolidation test on a clay specimen (drained on both sides), the following results were obtained. (7.5) Thickness of the clay layer = 25 mm P1= 100 kN/m2 e1= 0.81 P2= 200 kN/m2 e2= 0.73 Time for consolidation (t50) = 3.4 min Determine the hydraulic conductivity of the clay for the loading range

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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In laboratory consolidation tests on a clay specimen (drained on both sides), the following results were obtained:• thickness of clay layer = 25 mm• σ'1 = 50 kN/m2 , e1 = 0.75• σ'2 = 100 kN/m2 , e2 = 0.61• time for 50% consolidation (t50) = 3.1 minDetermine the hydraulic conductivity of the clay for the loading range.
Experimental data for clay specimen obtained initial values of e1 = 1.12 and P1 = 90 kPa, and final values of e2 = 0.90 and P2 = 460 kPa What is the hydraulic conductivity in cm/s if the coefficient of consolidation is 0.036 cm2/s
For normally consolidated clay layer in the field, the ff. values are given: Thickness of clay layer = 8.5ft, Void Ratio = 0.8; Compression Index = 0.28; Average effective pressure on the clay layer is 2650 lb/ft2; ∆σ = 970 lb/ft2; Secondary Compression index = 0.02. What is the total consolidation settlement of the clay layer five years after the completion of primary consolidation settlement? Time for completion of primary settlement = 1.5 years)
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.)
A clay layer 5 m thick has double drainage. It was consolidated under a load of 127.5 kN/m2. The load is increased to 197.5 kN/m2. The coefficient of volume compressibility is 5.79 × 10^–4 m2/Kn and value of k = 1.6 × 10^–8 m/min. If the test sample is 2 cm thick and attains 100% consolidation in 24 hours, what is the time in days taken for 100% consolidation in the actual layer? Show diagram
For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the hydraulic conductivity of the clay for the loading range in m/min. Show diagram
Use unit weight of water = 10kN/m3 in the following questions. A soil profile is shown in Figure Q2(c). If a uniform distributed load of 50 kN/m2 is applied at the ground surface, compute the average settlement of the clay layer caused by primary consolidation if; i)Determine the existing overburden effective stress at mid of clay layer ii) Settlement in clay if, the clay is normally consolidated, given Cc = 0.0085(LL-10) iii) Settlement in clay if, the preconsolidation pressure, pc’=200 kN/m2, given Cr=1/5Cc. Use Cc obtained in part (ii).
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.
For a clay layer with Tv value of 0.05 find the average degree of consolidation for the whole layer and the percent consolidation at depth ratios 0, 0.5, 1, 1.5 and 2.
Example 9.2: A clay soil, tested in a consolidometer, showed a decrease in void res •m 1.20 to 1.10 when the presure was increased from 0.25 to 0.50 kgflem?. Calculate to. efficient of compressibility (a) and the coefficient of volume compressibility (m). If t •ficient of consolidation (c,) determined in the test for the given stress increment u m?/year, calculate the coefficient of permeability in cm/s. If the sample tested at the site was taken from a clay layer 3.0 m in thickness, determin consolidation settlement resulting from the given stress increment. lution:
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,
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