9. Which of the following is true about quicksand?а.Occurs when effective vertical stress is greater than seepage forces in sandy soilsb.Occurs when effective vertical stress is less than seepage forces in cohesive soilsc. Is typically observed in gravelly soilsd. None10. Sensitivity in clays isa. The ratio of undisturbed to remolded strengthb. The ratio of dry to saturated strengthс.The ratio of long term to short term strengthd. The ratio of maximum and minimum principal stresses11. Which case/s should be investigated when identifying shear strength of saturated clays duringan excavation projecta. Drained condition casesb. Undrained condition cases with positive excess water pressureс.Undrained condition cases with negative excess water pressured. All12. A slickenside isa. Very smooth surface produced after a landslideb. Very rough surface produced after a slope failurec. Very steep surface produced during excavation in dry claysd. Very tough surface produced after a strike and dip13. Unconfined compressive strength isa. Half of undrained shear strengthb. Twice the undrained shear strengthc. Equal to the undrained shear strengthd. None14. As a geotechnical engineer, you have been requested to assess the shear strength properties fora sandy soil right after completion of foundation construction. What lab test would yourecommend from the following?а.Direct shearb. UCС.CU without pore pressure measurementsd. None15. CD test is known asa. Quick testb. Rapid testC. Slow testd. None

Hi there! since you have asked multiple questions, we will solve the first question for you. If you…

Which of the following is true about quicksand? a. Occurs when effective vertical stress is greater than seepage forces in sandy soils b. Occurs when effective vertical stress is less than seepage forces in cohesive soils Is typically observed in gravelly soils C. d. None

Which of the following is true about quicksand? a. Occurs when effective vertical stress is greater than seepage forces in sandy soils b. Occurs when effective vertical stress is less than seepage forces in cohesive soils Is typically observed in gravelly soils C. d. None

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 9.15P

See similar textbooks

Similar questions

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 dense silt layer has the following properties:Void ratio = 0.30Effecive diameter = 10umCapillary constant = 0.20 cm2Free ground water level is 8 m below the ground surface.a. Find the height of the capillary rise in the silt.b. Find the vertical effective stress in kPa at a depth of 5 m. Assume soil unit weight of 26.5 kN/m3 and that of soil above the capillary action rise and round surface is partially saturated at 50 %.c. Find the vertical effective stress in kPa at a depth of 10 m. Assume soil unit weight of 26.5 kN/m3 and that of soil above the capillary action rise and round surface is partially saturated at 50 %.......
A thin layer of silt exists at a depth of 18 m below the surface of the ground. The soil above this level has an average dry density of 15 kN/m3 and an average water content of 36%. The water table is almost at the surface. Tests on undisturbed samples of the silt indicate the following values: Cu = 45 kN/m2; φu = 18°; C′ = 35 kN/m2; φ′ = 27° Estimate the shearing resistance of the silt on a horizontal plane, when the shear stress builds up very slowly. (in kN/m2)
A soil layer consists of 4m upper layer of dry sand have a Gs= 2.64 and a void ratio of 0.53 and a lower layer is a clay having a void ratio of 1.0 and a specific gravity of 2.75. The effective stress at the bottom of the clay layer is equal to 93.46 kPa when the ground water is table is 4m below the ground surface. What is the thickness of the clay layer?
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. a. 260 b. 270 c. 280 d. 250
a dense silt layer has the following properties: void ratio = 0.50, effective diameter d10 = 10 um, capillary constant c = 0.20 cm2. free ground water level is 8.0 m below the ground surface. find the vertical effective stress in kpa at 5m depth. assume unit weight of solids = 26.5 kn/m3 and that the soil = 26.5 kn/m3 and that the soil above the capillary action rise and ground surfaces is partially saturated at 50% from the problem above, find the vertical effective stress at 10m depth. assume unit weight of solids=26.5kN/m3 and that the solid above the capillary action rise and ground surface is partially saturated at 50%.
Following are the results of consolidated-undrained triaxial tests on undisturbed soils retrieved from a 4-m thick saturated clay layer in the field (sat = 20.7 kN/m3). a. Estimate graphically the Mohr-Coulomb shear strength parameters c' and '. b. Estimate the shear strength in the middle of the clay layer.
For a normally consolidated soil, the following is given: Determine the following: a. The compression index, Cc. b. The void ratio corresponding to pressure of 200 kN/m2
A dense silt has the following properties: Void ratio (e) = 0.40, SpecificGravity (Gs) = 2.70, Effective diameter d10 = 1x10^-6 m, Capillary constant (C) = 0.20 cm^2. Free ground water level is 8.0 m below the ground surface. a. Find the height of capillary rise in the silt. b. Find the vertical effective stress in kPa at 5m depth. Assume that the soil abovethe capillary zone or capillary action rise to be dry soil and the soil within thecapillary action be partially saturated (degree of saturation, S) at 50%. c. Find the vertical effective stress at 10m depth. Assume that the soil above thecapillary zone or capillary action rise to be dry soil and the soil within the capillaryaction be partially saturated (degree of saturation, S) at 50%.
Use unit weight of water = 10kN/m3 in the following questions. A soil profile is shown in Figure Q2(c). If a uniform distributed load of 50 kN/m2 is applied at the ground surface, compute the average settlement of the clay layer caused by primary consolidation if; i)Determine the existing overburden effective stress at mid of clay layer ii) Settlement in clay if, the clay is normally consolidated, given Cc = 0.0085(LL-10) iii) Settlement in clay if, the preconsolidation pressure, pc’=200 kN/m2, given Cr=1/5Cc. Use Cc obtained in part (ii).
For the silty soil shown, the water table is located 8 m below the soil surface. The sieve analysis indicates the diameter corresponding to 10% finer in the particle-distribution curve is 25 cm. Due to capillary action the layer at the zone of capillary rise is of 50% saturated. Saturated unit weight of soil is 21.6 kN/m3. Void ratio = 0.40. C = 0.2 sq. cm. Compute the capillary rise. Compute the effective stress at depth of 7.5 m. Compute the effective stress at depth of 10 m.
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