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.

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.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Ground Improvement

Section: Chapter Questions

Problem 11.9P

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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.
PROBLEM 50: Compute the compression index of undisturbed clay having a plastic limit of 32% and a plasticity index of 8%
For a given consolidated clay: Gs= 2.71; LL= 45; In situ average effective overburden pressure = 120 kPa; In situ void ratio= 0.80 ; Thickness of clay layer = 4m ; average increase of effective stress on clay layer= 40 kPa; Effective pressure at the mid-height of clay layer= 60 kPa; Swell Index (Cs)= 1/5 Cc. Compute the primary consolidation settlement in mm. a.87.64 b.49 c.92.9 d.100.5
The soil profile at a site consists of a 3-m thick sand layer (moist unit weight = 16.5 kN/m^3, saturated unit weight = 18.5 kN/m^3) underlain by a 6-m thick clay layer (w = 27%, Gs = 2.70, mv = 0.31 MPa^-1, Cv = 2.6 m^3/year), which is underlain by a gravel layer as shown in the figure. A 3 m compacted fill with a unit weight of 20 kN/m^3 is required to be placed at ground level.a) What would be the final consolidation settlement, in mm rounded to the first decimal place?b) How long will it take for 50 mm consolidation settlement, in months rounded to the first decimal place?c) What would be the consolidation settlement in one year, in mm rounded to nearest whole number?
For a given consolidated clay: Gs= 2.71; LL= 45; In situ average effective overburden pressure = 120 kPa; In situ void ratio= 0.80 ; Thickness of clay layer = 4m ; average increase of effective stress on clay layer= 40 kPa; Effective pressure at the mid-height of clay layer= 60 kPa; Swell Index (Cs)= 1/5 Cc. Compute the compression index. a.0.534 b.0.513 c.0.315 d.0.145 With Free Body Diagram
A 2-meter clay layer (e = 0.88, Gs = 2.67, Cc = 0.305) is overlain with 4-meter-thick sand layer (e = 0.82, G = 2.72). The water table is at the interface of the sand and clay layer. If a 2-meter-thick land fill (γ = 17.97 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. Selected Answer: 60.25
For a given consolidated clay: Gs= 2.71; LL= 45; In situ average effective overburden pressure = 120 kPa; In situ void ratio= 0.80 ; Thickness of clay layer = 4m ; average increase of effective stress on clay layer= 40 kPa; Effective pressure at the mid-height of clay layer= 60 kPa; Swell Index (Cs)= 1/5 Cc. Compute the pre-consolidation pressure in kPa. a. 92.9 b. 49 c. 87.64 d. 100.5
A 3 meter clay layer (e = 0.93, Gs = 2.64, Cc = 0.329) is overlain with 4 meter thick sand layer (e = 0.76, G = 2.83) The water table is at the interface of the sand and clay layer. If a 3 meter thick land fill (y = 17.26 kN/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.
A 2-meter clay layer (e = 0.83, Gs = 2.66, Cc = 0.343) is overlain with 3-meter-thick sand layer (e = 0.84, G = 2.59). The water table is at the interface of the sand and clay layer. If a 3-meter-thick land fill (γ = 17.35 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.
For a given consolidated clay: Gs= 2.71; LL= 45; In situ average effective overburden pressure = 120 kPa; In situ void ratio= 0.80 ; Thickness of clay layer = 4m ; average increase of effective stress on clay layer= 40 kPa; Effective pressure at the mid-height of clay layer= 60 kPa; Swell Index (Cs)= 1/5 Cc. Compute the pre-consolidation pressure in kPa. Show free body diagram a.92.9 b.100.5 c.49 d.87.64
Q#3: For a normally consolidated clay layer in the field, the following values are given. Thickness of clay layer = 2.6 m Compression index = 0.28 Average effective pressure on clay layer 127 KN/m² Secondary compression index = 0.02 Δσ’ = 46.5 KN/m² Void ratio = 0.8 Time of Primary settlement = 1.5 years What is the total consolidation of the clay layer five years after the primary consolidation settlement?
A 4-meter clay layer (e = 0.89, Gs = 2.69, Cc = 0.349) is overlain with 4-meter-thick sand layer (e = 0.83, Gs = 2.51). The water table is at the interface of the sand and clay layer. If a 2-meter-thick land fill (Y = 17.36 kN/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.