Q-3: The constant-head permeability test arrangement in a two-layered soil has been arranged as shown in Figure. During the test, it was seen that when a constant head of h₁= 200 mm was maintained, the magnitude of h2 was 80 mm. If ki is 0.004 cm/sec, determine the value of k2. (given that H₁-100 mm and H₂= 150 nm). h₂ h₂ Soil 1 (k₁) ||1 Water supply ►||1 Soil 2 (k₂) TT h z H₁ ⒸCengage Learning 2014

Q-3: The constant-head permeability test arrangement in a two-layered soil has been arranged as shown in Figure. During the test, it was seen that when a constant head of h₁= 200 mm was maintained, the magnitude of h2 was 80 mm. If ki is 0.004 cm/sec, determine the value of k2. (given that H₁-100 mm and H₂= 150 nm). h₂ h₂ Soil 1 (k₁) ||1 Water supply ►||1 Soil 2 (k₂) TT h z H₁ ⒸCengage Learning 2014

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.18P

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Q: The constant-head permeability test arrangement in a two-layered soil has been arranged as shown in Figure. During the test, it was seen that when a constant head of h₁= 220 mm was maintained, the magnitude of h2 was 70 n If ki is 0.005 cm/sec, determine the value of k2. (given that H₁-120 mm and H₂= 160 mm). h₁ Soil 1 (ky) ►1 Soil 2 (k₂) Water supply T h TT H₁ H₂ ©ⒸCengage Learning 2014
Refer to the constant-head permeability test arrangement in a two-layered soil as shown in Figure 8.2. During the test, it was seen that when a constant head of h1= 200 mm was maintained, the magnitude of h2 was 80 mm. If k1is 0.004 cm/sec, determine the value of k2 given H1 = 100 mm and H2 = 150 mm.
A normally consolidated clay sample, which is fully saturated, was consolidated in thetriaxial cell under a particular all-round pressure of σ3. Upon consolidation, drainage valve isclosed and σ3 is kept constant while deviatoric stress was gradually increased under undrainedcondition until failure is reached. The following results are obtained: ½ (σ1 – σ3) = 1/3 σ3 and ½ (σ1′ + σ3′) = 2/3 σ3 Determine pore pressure coefficient Af′ at failure
A normally consolidated clay sample, which is fully saturated, was consolidated in thetriaxial cell under a particular all-round pressure of σ3. Upon consolidation, drainage valve isclosed and σ3 is kept constant while deviatoric stress was gradually increased under undrainedcondition until failure is reached. The following results are obtained: ½ (σ1 – σ3) = 1/3 σ3 and ½ (σ1′ + σ3′) = 2/3 σ3a) Determine φ′,b) Express the pore pressure, uf, at failure in terms of cell pressure,c) Determine pore pressure coefficient Af′ at failure
A normally consolidated clay sample, which is fully saturated, was consolidated in thetriaxial cell under a particular all-round pressure of σ3. Upon consolidation, drainage valve isclosed and σ3 is kept constant while deviatoric stress was gradually increased under undrainedcondition until failure is reached. The following results are obtained: ½ (σ1 – σ3) = 1/3 σ3 and ½ (σ1′ + σ3′) = 2/3 σ3a) Determine φ′,b) Express the pore pressure, uf, at failure in terms of cell pressure,c) Determine pore pressure coefficient Af′ at failured) Show that if sample is sheared under drained conditions, following results mayobtained: ½ (σ1 – σ3) = σ3 and ½ (σ1′ + σ3′) = 2σ3
A clay sample was consolidated in a triaxial cell under a backpressure of 50 kPa and cell pressure of 150 kPa. The drainage valve was then closed and the cell pressure was increased to 200 kPa when the pore pressure increased to 98 kPa. What is Skempton’s B-parameter? The above sample was then subjected to a vertical deviator stress, which was increased from zero under undrained conditions. The sample failed when the pore water pressure was 160 kPa and the deviator stress was 70 kPa. What is Skempton’s A-parameter at failure? Assuming the clay is normally consolidated, find the friction angle in terms of effective stresses.
For a constant head laboratory permeability test on a fine sand, the following values are given Length of specimen,L:6.75 inc Diameter of specimen:4 in Head difference,h: 23 in Water collected in 6 mins: 0.197 in³ Void ratio: 0.23 Determine the discharge of water (q) through the soil in in³/min.
For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the hydraulic conductivity of the clay for the loading range in m/min. Show free body diagram. a.1.31 x 10^-7 b.1.081 x 10^-3 c.2.56 x 10^-2 d.1.23 x10 ^-5
A clay sample was consolidated in a triaxial cell under a backpressure of 50 kPa and cell pressure of 150 kPa. The drainage valve was then closed and the cell pressure was increased to 200 kPa when the pore pressure increased to 98 kPa. What is Skepton’s B-parameter? The above sample was then subjected to a vertical deviator stress, which was increased from zero under undrained conditions. The sample failed when the pore water pressure was 160 kPa and the deviator stress was 70 kPa. What is Skempton’s A-parameter at failure? Assuming the clay is normally consolidated, find the friction angle in terms of effective stresses.
1.) For a constant head laboratory permeability test on a fine sand. Thefollowing values are obtained:Length of Specimen, L = 10 inchesDiameter of Specimen = 2.5 inchesHead difference, h = 2.5 inchesWater collected in 2 mins = 0.044 in3 The void ratio of the specimen is 0.34.Compute the following:a) Hydraulic Conductivity of the soil in in/minb) Discharge Velocity in in/minc) Seepage Velocity in in/min 2.) A series of direct shear test was performed on a soil sample. Thedata for the experiments are tabulated as follows: Specimen No. Normal Stress (kPa) Shearing Stress (kPa) 1 200 450 2 400 520 3 600 590 4 1000 730 a) Compute the cohesion of the soil.b) Compute the angle of internal friction.
Subject: Soil Mechanics Please provide a solution and a diagram For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the hydraulic conductivity of the clay for the loading range in m/min. a. 1.081 x 10^-3 b. 2.56 x 10^-2 c. 1.31 x 10^-7 d. 1.23 x10 ^-5
During a falling head test, the head fell from 80cm to 65cm in 83 seconds. The specimen was 5cm in diameter and had a length of 100mm. the diameter of the standpipe was 0.80 cm. Temperature during the test is 90deg. C. a.) Compute the coefficient of permeability of the soil at 20deg. C _____cm/min b.) Compute Seepage velocity if the void ratio is 0.90 _____cm/min c.) Determine the Rate of flow _____cm/min