A normally consolidated clay layer 4.38 m. thick has a void ratio of 1.06. Liquid limit is equal to 37 and the average effective stress on the clay layer was 79 kPa. The average stress on it is increased to 117 kPa. as result of the construction of a foundation. If the clay layer is preconsolidated, compute the consolidation settlement in millimeters if the preconsolidation pressure is 138 KPa. Use Cs = 1/6Cc.

A normally consolidated clay layer 4.38 m. thick has a void ratio of 1.06. Liquid limit is equal to 37 and the average effective stress on the clay layer was 79 kPa. The average stress on it is increased to 117 kPa. as result of the construction of a foundation. If the clay layer is preconsolidated, compute the consolidation settlement in millimeters if the preconsolidation pressure is 138 KPa. Use Cs = 1/6Cc.

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

See similar textbooks

Similar questions

A 5.1 m thick clay soil with a current overburden pressure of 89 kPa is going to experience an additional stress of 89 kPa after a new structure is built. If it was determined that the clay is normally consolidated has an initial void ratio of 1.2, a recompression index of 0.07, and a compression index of 0.47. Determine the total amount of settlement that is expected to occur. Provide your answer in meters to 3 decimal places.
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 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
A 3 meter thick fill was placed over a 9 meter thick compressible clay. Underlying the clay layer is a very hard impermeable clay. The groundwater table is located on top of the compressible clay. A circular tank 9 meters in diameter transfers a surface contact stress of 45 kPa. Assume for this problem that the settlement of the fill and the very hard clay is small compared to the settlement of the compressible clay. a) Calculate the initial void ratio and saturated density of the compressible clay. b) Divide the compressible layer into two sublayers of equal thickness. The preconsolidation pressure is 100 kPa for the upper sublayer and 160 kPa for the lower sublayer. Calculate the following at the center of each sublayer: the increase in vertical stress caused by the tank underneath its center, and the consolidation setttlement due to the combined effect of the tank and weight of fill. c) How long will it take for 0.18 meters of settlement to occur? d) After 3.6 years, what…
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 3.75 m thick clay layer (drained on one side) is normally consolidated. When the pressure increase from 50 KN/m2 to 150 KN/m2 , the void ratio decreases from 0.9 to 0.75.For the clay Cv=0.24 cm2/sec.a. Interpret the time in days for the clay layer to reach 50% consolidation. b. Interpret the settlement at that time i.e, at 50% consolidation.
A 2m clay layer has values of e = 0.92 , Gs = 2.72 and liquid limit of 40%. Above the clay is a 3m thick layer sand with e = 0.50 and Gs = 2.62. The water table is located 1.6 m below the ground surface having a unit weight of 17.3 kN/cu. Meter, determine the following: a. Compression index of clayb. Effective pressure at the midpoint of clayc. Primary settlement for normally consolidated clay.......
For a normally consolidated insensitive clay 0_CD= 30°. Deviator stress at failure of the same soil is 250 kN/m2 in CU test. If Skempton's A-parameter at failure is 0.62, find out the confining pressure during the consolidation state. a 280 b. 260 c. 270 d. 250
A normally consolidated clay layer, 4m thick, has the following properties:Initial void ration, eo = 0.65Compression Index, Cc = 0.20Average effective pressure, σ’o = 100 kPaExpected pressure increase due to loading on ground surface = 30 kPaSecondary compression index, Cα = 0.02Time for completion of primary settlement = 1.5 yearsWhat is the total settlement of the clay layer five years after the completion of primary consolidation settlement?
A normally consolidated clay layer, 3 m thick, has the following properties : Initial void ratio, e0= 0.8 Compression index, Cc = 0.25 Average effective pressure, σ’0 = 125 Kpa Expected pressure increase, Δσ’ = 45 Kpa Secondary compression index, Ca = 0.02 Time of completion of primary settlement = 1.5 years What is the total settlement of the clay layer five years after the completion of the primary settlement?
For a given over consolidated clay: Specific gravity = 2.71 , Liquid limit = 45, In situ average effective over burden pressure = 120 kPa ,In situ void ratio = 0.80, Thickness of clay layer = 4m , ∆P = 40 kPa, Effective pressure at the mid – height of clay layer = 60 kPa , Swell index (Cs) = 1/5 Cc1.) Compute the compression index. 2.) Compute the pre – consolidation pressure. 3) Compute the primary consolidation settlement.
Knowing that the compression index, Cc = 0.333, and the preconsolidation pressure s’c = 140 kPa with an initial void ratio e0 = 0.85 for a H = 3 m thick clay layer which is subjected to a new loading for an embankment resulting in a stress increase to 200 kPa; what is the expected consolidation settlement? Provide answer below in meters (m).