Given the following consolidation test, plot the e-log p relationship and determine if the clay layer in the field is normally consolidated or overconsolidated soil. Plot the field consolidation relationship, and determine the consolidation settlement of the clay layer due to the addition of distributed stress = 90 kPa Pressure (kPa) AH (mm) de AP 90 kPa 0.891 Yume- 15 AN 3m W. 54 0.253 0.025 0.866 107 0.507 0.050 0.841 Sand 5m 214 0.892 0.089 0.802 Clay Y- 173 KNim 429 1.551 0.154 0.737 20 m 858 2.392 0.238 0.653 1716 3.324 0.331 0.560 3432 4.263 0.424 0.467 100 3.520 0.350 0.541

Given the following consolidation test, plot the e-log p relationship and determine if the clay layer in the field is normally consolidated or overconsolidated soil. Plot the field consolidation relationship, and determine the consolidation settlement of the clay layer due to the addition of distributed stress = 90 kPa Pressure (kPa) AH (mm) de AP 90 kPa 0.891 Yume- 15 AN 3m W. 54 0.253 0.025 0.866 107 0.507 0.050 0.841 Sand 5m 214 0.892 0.089 0.802 Clay Y- 173 KNim 429 1.551 0.154 0.737 20 m 858 2.392 0.238 0.653 1716 3.324 0.331 0.560 3432 4.263 0.424 0.467 100 3.520 0.350 0.541

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.15P

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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.)
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)
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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?
The figure below shows a 20 m thick layer of normally consolidated clay (ϒt = 18.6 kN/m3) that is one-dimensionally loaded by Δσv = 60 kPa. The clay layer is below a 5 m thick layer of granular fill (ϒt = 19.6 kN/m3), and a dense, compacted glacial till underlies the clay. The water table is located at the top of the clay layer. A 1-D consolidation test is performed on a 3.00 cm thick, doubly drained specimen from the middle of the clay layer. When the stress conditions from the field (including the Δσv = 60 kPa) are applied to this specimen, it takes 1.5 minutes for 60% average consolidation to occur.a. From the lab test data, determine cv for the soil.b. Compute pore water pressure at 20 m depth 7 years after the Δσv is applied to the clay layer. c. Compute the average degree of consolidation 7 years after Δσv application.
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