Assuming dense glacial till at the bottom is as permeable as the granular fill, the surcharge pressure at the ground surface is Do= 500 kPa. What is the excess pore pressure remaining at a point, 5 m into the clay layer (1/4 layer depth) at the moment when the time factor is Tv=0.2? (Unit: kPa) Ao 3 m Granular fill, yt 19.6 kN/m3 Clay, Y = 18.6 kN/m3 20 m Dense alacial till CS Scanned with CamScanner

Assuming dense glacial till at the bottom is as permeable as the granular fill, the surcharge pressure at the ground surface is Do= 500 kPa. What is the excess pore pressure remaining at a point, 5 m into the clay layer (1/4 layer depth) at the moment when the time factor is Tv=0.2? (Unit: kPa) Ao 3 m Granular fill, yt 19.6 kN/m3 Clay, Y = 18.6 kN/m3 20 m Dense alacial till CS Scanned with CamScanner

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 9.17P

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Similar questions

A clay layer 8 meter thick is subjected to a pressure of 70 kN/m². If the layer has a double drainage and undergoes 50% consolidation (T, = 0.196), in one year, determine the coefficient of consolidation? If the coefficient of permeability is 0.040 m/year, determine the settlement in one %3D year. Use Yw = 9.81 kN/m³.
b) 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.
A 3 m thick soil has coefficient of permeability 3 x10^-7 m/s. A separate test porosity 40% and bulk unit weight 21 kN/m^3 at a moisture content of 31%. Determine the head at which upward seepage will cause quick condition? a. 1.034 m b. 2.724 m c. 3.1 m d. 6.12 m
A 3 layer soil has the following properties from top to bottom. Obtain the equivalent vertical coefficienct of permeability, in cm/sec, round off to 7 decimal places, and obtain the equivalent horizontal coefficient of permeability, in cm/sec, round off to 5 decimal places.
Question 6 A 3-meter clay layer (e = 0.86, Gs = 2.69, Cc = 0.304) is overlain with 2-meter-thick sand layer (e = 0.77, G = 2.83). The water table is at the interface of the sand and clay layer. If a 2-meter-thick land fill (γ = 17.53 kN/m3) is placed over the existing ground surface, compute the consolidation settlement (in mm.) of the clay layer. Hint: Use the land fill's resulting pressure on the ground surface as the stress increase. Round off to two decimal places.
A 2-meter clay layer (e=0.89, Gs=2.55, Cc=0.325) is overlain with 2 meter thick sand layer (e=0.82 G=2.63). the water table is at the interface of the sand and clay layer. if a 2-meter thick land fill (y=17.15kN/m^3) is placed over the existing ground surface, compute the consolidation settlement (in mm) of the clay layer. hint: Use the land fill's resulting pressure on the ground surface as the stress increase.
11.3 Refer to Figure (11.22). Given: H₁ = 2.5 m, H₂ = 2.5 m, H3 = 3 m, and Ao = 100 kN/m². Also, • Sand: e = 0.64, G₁ = 2.65 • Clay: e=0.9, Gs=2.75, LL-55, C = 0.405 Estimate the primary consolidation settlement of the clay layer assuming that it is normally consolidated. Ao Groundwater table H₂ Void ratio = Sand Clay +
a. Determine the equivalent horizontal coefficient of permeability b. Determine the equivalent vertical coefficient of permeability
For a clay layer in the field, the following values are given: • Thickness of clay layer = 3 m • Natural Void ratio = 1.65 • Compression index (CC) = 0.28, • Cr = 0.02 • Average effective pressure on the clay layer = 130 kN/m2 • OCR=1.5 Estimate the increase in settlement caused by an increase in pressure in the layer of 65 kPa.
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. Find settlement in cm at 50% consolidation. a.25.78 b.10.32 c.32.56 d.20.27
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 10-ft-thick clay layer is drained at the top and bottom. Its characteristics are Cvr = Cv (for vertical drainage) = 0.042 ft2/day, rw = 8 in., and de = 6 ft. Estimate the degree of consolidation of the clay layer caused by the combination of vertical and radial drainage at t = 0.2, 0.4, 0.8, and 1 year. Assume that the surcharge is applied instantaneously, and there is no smear.