10.17 A 4.0 m thick fill is to be made of a soil with a Proctor maximum dry unit weight of19.4 kN/m² and an optimum moisture content of 13.0%. This fill will be compacted atoptimum moisture content to an average relative compaction of 92%. The underlyingsoils are as shown in Figure 10.26. Consolidation tests were performed at Points A and B,with the following results:SampleAСс0.59Cr ୧୦0.19 1.90σ (kPa)75B0.37 0.141.21100The silty sand is normally consolidated.Using hand computations, determine theultimate consolidation settlement due to the weight of this fill.

Answered: 10.17 A 4.0 m thick fill is to be made…

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 11.16P

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CEN 333 Geotechnical
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Two identically clay samples of the same size designated as A and B are subjected to consolidation under identical conditions. Drainage takes place through one face in sample A and through both the faces in sample B. 50% consolidation of sample A occurs in 10 minutes. The time required for 50 % consolidation to occur in sample B in minutes will be. (a) 40 (c) 5 (b) 10 (d) 2.5
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3. A stratum of normally consolidated clay is 25 feet thick and the water content is measured as 50% (Gs=2.7). Consolidation tests on undisturbed samples of the clay indicate Ce = 0.68. On top of the clay is 5 feet of sand with a total unit weight of 120 pcf. To build a parking lot, 8 feet of fill is now placed on top of the sand. Tests on the fill indicate that the average water content is 10% and the average dry unit weight is 115 pef. The water table is located 2 ft below the ground surface. Calculate the settlement of the clay due to the added weight of the fill. Treat the clay as one layer and compute the stresses and change in void ratio at mid-depth in the clay.
Results of two consolidated-drained triaxial tests on a clayey soil are as follows: o1 (fallure) (kN/m²) Test no. (kN/m?) 104 320 2 207 517 16. Determine the angle of friction and cohesion in undrained condition 17. Determine the angle of friction and cohesion in drained condition if the porewater pressure is 150 kPa
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Q1: A clay specimen was tested in a laboratory consolidation device, which was 12.7 mm thick and the top & bottom boundaries were drained. A 50% consolidation time on the specimen was obtained as 28.4 minutes, Determine the Following: a- The time for 50% consolidation in the field with a 2.5 m thickness where ‘only the top layer is drained. b- The time for 90% consolidation in the field with a 2.5 m thickness where only the top layer is drained. c- For the same field condition above, find the settlement after 1year, if the final consolidation settlement = 0.0345 m.
In a consolidated drained tri-axial text on a normally consolidated clay soil, a deviator of 152 kPa was required to fail the sample when the confining pressure was 70 kPa. A. What was the angle of shearing resistance? B. Suppose that after consolidation under the 70 kPa confining pressure, the sample is placed in an unconfined compression apparatus and tested. Determine the resulting shear strength.
Problem 3: A soil sample has a liquid limit of 70 % and plastic limit of 50 %. U-line : PI = 0.9 (LL - 8) A- Line: PI = 0.73 (LL - 20) 60 1. Determine the point of intersection of the U-line and A-line. 2. Compute the shrinkage limit, SL using the plasticity chart. 3. Compute the Specific Gravity, Gs of the Soil if SR = 1.37. ALine PI -07NL - 20) 20 10 40 60 00 Liguid limi Plasticity indes
Determine the ultimate consolidation settlement of the entire deposit. Where the distance of A is 3m and the distance of B is 2.25.

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