A 5m thick saturated soil stratum has a compression index of 0.25 and coefficient of permeability 3.2x10 3 mm/sec. if the void ratio is 1.9 at vertical stress of 0.15 N/mm2, The void ratio when the vertical stress is increased to 0.2 N/mm2. Choose... The consolidation settlement (mm) due to stress increase of 0.2 N/mm2 is: Choose...

A 5m thick saturated soil stratum has a compression index of 0.25 and coefficient of permeability 3.2x10 3 mm/sec. if the void ratio is 1.9 at vertical stress of 0.15 N/mm2, The void ratio when the vertical stress is increased to 0.2 N/mm2. Choose... The consolidation settlement (mm) due to stress increase of 0.2 N/mm2 is: Choose...

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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2. For a certain soil profile, a uniformly distributed load, ΔP = 50kPa, is applied at the ground surface. Assume CS = 0.20CC. Take e = 0.95, LL = 50, height of clay layer = 8m and PO = 136.9kPa. Determine the settlement of the clay layer caused by primary consolidation if:a. The clay is normally consolidated. b. The preconsolidated pressure PC is 210kPa. c. The preconsolidation pressure PC = 150kPa.
A 3 m thick saturated soil stratum has a compression index of 0.25 and coefficient of permeability 3.2 x 10-3 mm/sec. If the voids ratio is 1.5 at vertical stress of 0.10 N/mm2, compute the voids ratio when the vertical stress is increased to 0.25 N/mm2. Also calculate settlement due to above stress increase and time required for 50% consolidation. Assume single drainage
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?
4. A soil strata can be described as 6 meters of sand underlain by 4 meters of clay with the water table located 7 meters from the bottom of said strata. The sand has a dry and saturated unit weight of 14 kN/m3 and 18 kN/m3 resp. On the other hand, pertinent clay properties are saturated unit weight of 19 kN/m3 , void ratio of 0.8 and liquid limit of 40. Compute the primary consolidation settlement considering the following conditions if a uniform load of 90 kPa is acting on the soil. If necessary, assume a logical value of Cs. A. The clay is normally consolidated. B. The pre-consolidation pressure is 190 kN/m2 C. The pre-consolidation pressure is 170 kN/m2.
The soil profile consists of a 12 m layer of sand, 6 m layer of clay and incompressible bedrock.The water table is located 5 m below the ground surface. The weight of sand above the watertable is 17.9 kN/m3 below is 18.4 kN/m3 . The saturated weight of the clay is 18.2 kN/m3. Clayhas a compression index of 0.18 and a void ratio of 0.80. If the structure to be built on theground will increase the soil pressure by 100 kPa, determine the settlement of the clay layer.
A soil profile, under surcharge load of 25 kN/m2 at ground level, consists of 6m sand and 3m clay layer. Ground water table is 2m below sand layer. Dry unit weight and saturated unit weight of sand is 15.80kN/m3 and 16.90kN/m3 respectively. Clay layer, Gs=2.67 and saturated unit weight is 18.80 kN/m3. Determine a)Increase in stress at the mid layer of clay b) With dewatering 2m, what is the stress increase at the mid layer of clay c) How much must the water level be lowered to me more effective than the surcharged load?
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
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.
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.
For a normally consolidated insensitive clay ∅_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. Show free body diagram a.260 b.250 c.270 d.280
A pressure increase of 250 kPa is imposed across a wide region above the depicted soil profile. The clay stratum is initially under normal consolidation and has a coefficient of consolidation (cv) of 0.002 cm2/s. The groundwater level sits 3.5 meters beneath the soil surface. Determine the settlement of the clay layer, in millimeters, 40 days following the application of the pressure increase. noted that The final settlement at the end of primary consolidation is equal to 515 mm.
Under a given surcharge, a 5.1 m thick layer has consolidation settlement of 306 mm. Assume Cv=0.003 sqcm/sec. a. What is the average degree of consolidation for the clay layer when the settlement is 85mm? b. How long will it take for 60% consolidation to occur if the layer is drained at the top only? c. How long will it take for 60% consolidation to occur if the layer is drained on both ends? Please answer this asap. For upvote. Thank you very much