A laboratory consolidation test on a 20 mm thick sample of soil shows that 90% consolidation occurs in 30 minutes. Plot a settlement (degree of consolidation) – time curve for a 10 m layer of this clay in the field for (a) single drainage, and (b) double drainage

Q: What is consolidation? Explain the concept of NCR and OCR with examples in your own words.

A: Since, the question to be solved is not stated, the solution for question 2a is as follows:…

Q: A  shrinkage limit test for a saturated specimen had the initial volume Vi = 21.35 cm3 and initial…

A: Given: The initial volume Vi is 21.35 cm3. The initial weight Wi is 0.363 N. The final volume Vf is…

Q: A 3m deep sand layer has a specific gravity of 2.68 and a void ratio of 0.60. Under this layer is a…

A: step 1-

Q: undisturbed sample of saturated clay has a volume of 16.5 cm3 and weighs 35.1 g. On oven drying, the…

A:

Q: Situation 1 - a. A soil sample has specific gravity of 2.7 and unit weight at zero air voids…

A: Given that,  specific gravity, G = 2.7 unit weight at zero air voids, γd = 15.08 kN/m3 The void…

Q: A clay specimen was tested in a laboratory consolidation device, which was 25.4 mm (1 in.) thick and…

A: Given,Percentage of consolidation, U% = 90%Time of 90% consolidation, t = 2.2 hours = 2.2×60 = 132…

Q: The time required for 50% consolidation of a 25 mm thick layer (drained at both top and bottom) in…

A: Given data  Percentage of consolidation  Thickness of laboratory soil sample  2 way drainage Time to…

Q: A 20 mm thick laboratory soil sample reaches 60% consolidation in 32.5 seconds under double drainage…

A: Given- thickness of soil sample H=20 mmConsolidation U=60% time t=32.5 sDouble drainage conditionIt…

Q: If a representative clay specimen 20 mm thick, under double drainage, took 121 minutes for 90%…

A: thickness of clay layer = 20mm time taken for 90% primary consolidation = 121minutes   It has been…

Q: An undisturbed soil sample, 100 mm in diameter and 200 mm high, was tested in a triaxial machine.…

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Q: Laboratory tests on a 25mm thick clay specimen drained at both the top and bottom show that 50%…

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Q: Situation 14 - A 3-layer soil has the following properties from top to bottom: a. Obtain the…

A: Now  We have to find the value of the a) Horizontal equivalent coefficient of permeability (KH) in…

Q: Refer to Figure P2.18. A total of 60 mm consolidation settlement is expected in the two clay layers…

A: Given:- The total consolidation settlement expected in the two clay layers = 60 mm  To determine:-…

Q: An undisturbed soil sample 30 mm thick got 50% consolidated in 20 minutes with drainage allowed at…

A: Given, Consolidation test result of laboratory,  t1= 20min H1= 30mm For field:- H2= 4m Find:- time…

Q: A soil profile is given in Figure 7.18a. The consolidation test in the laboratory was carried out to…

A: Given data: Surcharge = 50 kN/m2. Ground water at surface Clay saturated unit weight = 18 kN/m3.…

Q: 3.36. A site consists of 3 m thick loose sand with an in- "situ void ratio of 0.75. The laboratory…

A: Step 1

Q: Question attached

A: given data: L=2500 ft C=12

Q: Discuss in your own words the cylinder spring model for the consolidation settlement in saturated…

A: Cylinder spring model for the consolidation settlement in saturated clayey soil.  Cylinder Spring…

Q: A 20 mm-thick sample in a singly drained laboratory consolidation test reaches 75% consolidation in…

A: The time factor for consolidation is given by,

Q: shrinkage limit test for a saturated specimen had the initial volume Vi = 21.35 cm3 and initial…

A:

Q: Three samples of loose sand were tested under consolidated undrained conditions. The failure…

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Q: a. How long will it take for 50% settlement to occur? Cv = 0.002 cm2 /sec. b. How long will it…

A: Given: consolidated clay layer = 3m = 300cm settlement  =  80 mm Cv = 0.002 cm2

Q: Soil Compaction Calculate the dry volume weight for the zero-air-void condition (in kN / m³) for a…

A: The formula to calculate the dry unit weight for the zero-air-void condition is given by,…

Q: A clay specimen was tested in a laboratory consolidation device, which was 12.7 mm (½ in.) thick and…

A: Given that:                       size of specimen, h = 12.7 mm                            So,…

Q: A soil sample has a maximum void ratio of 0.85 and minimum void ratio of 0.55. It was also found out…

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Q: A raft footing is to be constructed on a 7.5 m thick clay layer which lies between two sand layers.…

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Q: Two identical soil samples C and D were consolidated to effective confining pressures of 100 and 300…

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Q: A site consists of 3m thick loose sand with an insitu void ratio of 0.75. The laboratory tests show…

A: Introduction- A mixture's void ratio is the volume of voids divided by the volume of solids. Control…

Q: A normally consolidated clay layer is 4 m. (one-way drainage). From the application of a given…

A: (i)

Q: A soil sample has an initial unit weight of 16.7 Kilo-Newton per cubic meter with a saturation of 18…

A: Given Data:Unit weight = 16.7 kNm3saturation 18%saturation increased to 41% Unit weight = 18.3 kN/m3

Q: A sand is densified by compaction at a site so that the void ratio changes from 0.80to2.70. what is…

A: Given data: Specific gravity of soil (G) =2.7 Initial void ratio of the soil (ei) = 0.8 Void ratio…

Q: A clay specimen was tested in the laboratory consolidation device, which had 25.4 mm (1 inch) thick…

A: Given: The thickness d is 25.4 mm. 90 % consolidation time on the specimen was obtained as 2.2 hours…

Q: A 10 ft thick clay layer of saturated clay (two-way drainage) under a loading underwent 90% primary…

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Q: Laboratory tests on a 25mm thick clay specimen drained at both the top and bottom show that 50%…

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Q: with all-round pressure of 200 kPa has been solidified to a specific volume of 1.9. The second clay…

A: Given:- all round pressure=200kPa specific volume=1.9 all round pressure=600kPa expand to…

Q: er (with top and bottom drainage) is projected to have 10 inches of consolidation settlement. There…

A: Given:- t=10 ft consolidation settlement=10inches t=35 year settlement in 35 years = 3inches To…

Q: . A saturated soil sample has a unit weight of 23 Kn/m^3 and specific gravity of 2.69. Compute the…

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Q: A soil specimen with volume of 0.60x10-4 m3 , weighs 0.105 kg. Its dry weight is 0.0802 kg, and Gs…

A:

Q: (b). The results of a consolidation test on an undisturbed soil sampled at a depth of 10m below the…

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Q: 4. A 3.2 m thick layer of saturated clay undera surcharge loading underwent 90% primary…

A: Given data in question Thickness of layer 2 way drainage  = d =H/2 90% consolidation  Time taken To…

Q: The time required for 50% consolidation of a 25-mm-thick clay layer (drained at both top and bottom)…

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Q: The time required for 50% consolidation of a 25-mm-thick clay layer (drained at both top and bottom)…

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Q: A certain clay layer has thickness of 5 m. After 1 year, when the clay was 50% consolidated, 8 cm of…

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Q: QI: A normally consolidated clay layer is 5 m thick (one-way drainage). From the application of a…

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Q: The figure shows the soil profile at a site where you plan to lower the water table. You have…

A: All the calculations are shown in below tabs. Here is  a big problem where water level is reduced…

Q: 9.4 A clay specimen was tested in a laboratory consolidation device, which was 12.7 mm (½ in.) thick…

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Q: Two clay specimens A and B, of thickness 2cm and 3cm, have equilibrium voids rations 0.68 and 0.72…

A: Given: For Clay specimens A : initial void ratio, eo = 0.68      final void ratio, e = 0.50  So,…

Q: A 3 m thick stratum (drained in two directions) of saturated Clay and under overburden, exhibited…

A: Given Data: Saturated Clay of thickness (H) = 3 m Both way drainage Primary Consolidation (U) = 90%…

Q: Resuits of a lavoratory consolidation test on a 5 meter thick clay (at a site) indicates t 50 = 12.2…

A: Given data Clay thicknessH=5 mt50=12.2 min∆=8 tons/ft2Sample heighth=1.582 cm a} For 50% Degree of…

Q: For a normally consolidated clay layer in the field, the following values are given: Thickness of…

A: Given :

Consolidation parameters

Consolidation is the process of expulsion of pore water present in the voids of soil solids under the pressure of the applied load. This is a quick process in the case of coarse-grained soils since the permeability is high due to the presence of more voids, while it is a slow and gradual process in the case of clayey soil as the permeability of clay is less. An example of consolidation is the settlement of soil under a building due to the load coming from the building.