![5, A soil element inside a 20° natural soil slope carries total vertical stress (%) of 140 kPa, total horizontal stress (on) of 80 kPa and shear stress (Tvh) of 15 kPa Canticlockwise shear stress on vertical plane). The pore-water pressure (u) inside the element is 30 kPa. The critical state angle of friction of the soil is 30o and its undrained shear strength is 40 kPa. (a) Draw the Mohrs stress circles for this element in terms of total and effective stresses. Is the soil element at failure? Give reason(s) in support of your answer. [6 marks] It is anticipated that the pore-water pressure in the element may increase due to change in the groundwater flow condition. Compute the increase in pore-water pressure needed to cause the failure of the element, assuming that the total normal stresses and shear stresses in the element remain unchanged. [4 marks] Draw the Mohrs stress circle in terms of effective stresses at failure. Estimate the inclination of the failure plane with respect to horizontal and the magnitude of maximum shear stress in the element at failure. [10 marks] (b) (c)](http://img.homeworklib.com/questions/85abfbf0-7b03-11eb-8c57-592963d60213.png?x-oss-process=image/resize,w_560)
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5, A soil element inside a 20° natural soil slope carries total vertical stress (%) of...
4. Shear Strength A sample of cohesive soil with undrained shear strength of 30 Kpa is beng tested in a triaxial est with a confining pressure of 15 Kpa (see the figure below). Sketch the failure...
4. Shear Strength A sample of cohesive soil with undrained shear strength of 30 Kpa is beng tested in a triaxial est with a confining pressure of 15 Kpa (see the figure below). Sketch the failure envelope and Mohr's circle representing the state of stress at failure. Evaluate the following: (i) The vertical axial stress at failure. (ii) The major and minor principal stresses at failure (ii) The orientation of failure plane with respect to horizontal plane. (iv) The normal...
2. The results of a Consolidated Undrained (CU) triaxial test on a sand soil are in the figures below. The sample was subjected to a vertical load (do). At failure, the Δσ was 914 psi and the induced...
2. The results of a Consolidated Undrained (CU) triaxial test on a sand soil are in the figures below. The sample was subjected to a vertical load (do). At failure, the Δσ was 914 psi and the induced pore water pressure at failure (Au) was 683 psi. consolidated to a stress of 12 psi and then Au 6.83 psi σ,-12 psi -σ,-12 psi Sand At Failure Initial (Consolidation) A. Draw both the total and effective stress Mohr's Circles at failure...
The state of stress within the soil below the ground surface is σ.-28 kPa, σ,-14 kPa,...
The state of stress within the soil below the ground surface is σ.-28 kPa, σ,-14 kPa, and t-4 kPa on the horizontal plane. Using Mohr's circle; a) Find the magnitude and directions of the major and minor principal stresses, that is the plane on which there are no shear stresses. b) If the material is a loose sand with a known friction angle of p-30 degrees and c'-0, construct the Coulomb failure envelope and determine if this soil is in...
Question 1: A point within an embankment slope has vertical normal stress (o) of 100 kPa,...
Question 1: A point within an embankment slope has vertical normal stress (o) of 100 kPa, a horizontal normal stress (ox) of 60 kPa, and a horizontal shear stress (Txy) of 20 kPa. (a) Determine the major and minor principle stresses (b) Determine the orientation of the major principle stress (in degrees from vertical, clockwise or counterclockwise) Question 2: A point within an embankment slope of sand has a total vertical normal stress (σ) of 100 kPa, a total horizontal...
Please only answer if you have good personal understanding of problem. i rate. include relevant d...
please only answer if you have good personal understanding of
problem. i rate. include relevant drawing and details for
understanding
Problem 8 Consolidated undrained triaxial tests for two similar specimens with different con- solidation stresses were performed and the data in Figure 11.21 is obtained, which includes pore water pressure measurements. Plot Mohr's circles at failure for two specimens in both the total stress and in the effective stress and determine the shear strength parameters c and ф from the...
(12 marks) (a) In a triaxial test for sand (c) the stress increment (s)-2.5o. What is...
(12 marks) (a) In a triaxial test for sand (c) the stress increment (s)-2.5o. What is the angle of internal frictica (o (b) A consolidated undrained (CU) triaxial test was performed on two samples of a clay and the results are: Test No. Cell pressure (kNm) Devilo stress ( km) Pore water pressure (kN) G; 1 150 500 220 (i) The Mohe circles and the failure line in terms effective stresses are drwn as shown in the figure below. List...
soil mechanics will rate if correct 13. A consolidated, undrained (CU) Triaxial test was performed on...
soil mechanics
will rate if correct
13. A consolidated, undrained (CU) Triaxial test was performed on a normally consolidated, saturated clay. The minor principal effective stress at the end of consolidation phase, c'3c was 100 kPa. The deviatoric stress, Aod, at failure was 60 kPa. The excess pore pressure at failure, Au was 45 kPa. What is the effective friction angle, "? (a) 21 degrees (6) 26 degrees (e) 33 degrees 14. A consolidated, undrained (CU) Triaxial test was performed...
The figure shows an element of soil at the interface between two dry sand layers on a a-32° slope...
The figure shows an element of soil at the interface between two dry sand layers on a a-32° slope The interface is d=7 m below the ground surface and ror both sand layers the friction angle is φ=30, and Ko= 0.41 Assume that the shear stress is zero on both the vertical and horizontal planes. Va1 (dry unit weight of sand layer 1) - 19 kN/m3 Ys2 (dry unit weight of sand layer 2) 20 kN/m Dry Sand (Yai Dry...
For the soil strata, draw diagrams indicating the total stress, pore pressure and effective stress profiles...
For the soil strata, draw diagrams indicating the total stress, pore pressure and effective stress profiles to the bottom of clay layer. Fine sand has a thickness of 6 m (FST) with saturated unit weight of 18 kN/m2. Clay has a thickness of 8 m with saturated unit weight of 14 kN/m3 The water table is located at depth of 0.7 of fine sand thickness below the ground surface (i.e. depth=0.7*FST). Fine sand will sustain capillarity (suction). Assume the same...
5.1 What is the shear strength in terms of effective stress on a plane within a...
5.1 What is the shear strength in terms of effective stress on a plane within a saturated soil mass at a point where the total normal stress is 295 kPa and the pore water pressure 120 kPa? The strength parameters of the soil for the appropriate stress range are 0 = 30° and c'=12 kPa.
4. Shear Strength A sample of cohesive soil with undrained shear strength of 30 Kpa is beng tested in a triaxial est with a confining pressure of 15 Kpa (see the figure below). Sketch the failure envelope and Mohr's circle representing the state of stress at failure. Evaluate the following: (i) The vertical axial stress at failure. (ii) The major and minor principal stresses at failure (ii) The orientation of failure plane with respect to horizontal plane. (iv) The normal...
2. The results of a Consolidated Undrained (CU) triaxial test on a sand soil are in the figures below. The sample was subjected to a vertical load (do). At failure, the Δσ was 914 psi and the induced pore water pressure at failure (Au) was 683 psi. consolidated to a stress of 12 psi and then Au 6.83 psi σ,-12 psi -σ,-12 psi Sand At Failure Initial (Consolidation) A. Draw both the total and effective stress Mohr's Circles at failure...
The state of stress within the soil below the ground surface is σ.-28 kPa, σ,-14 kPa, and t-4 kPa on the horizontal plane. Using Mohr's circle; a) Find the magnitude and directions of the major and minor principal stresses, that is the plane on which there are no shear stresses. b) If the material is a loose sand with a known friction angle of p-30 degrees and c'-0, construct the Coulomb failure envelope and determine if this soil is in...
Question 1: A point within an embankment slope has vertical normal stress (o) of 100 kPa, a horizontal normal stress (ox) of 60 kPa, and a horizontal shear stress (Txy) of 20 kPa. (a) Determine the major and minor principle stresses (b) Determine the orientation of the major principle stress (in degrees from vertical, clockwise or counterclockwise) Question 2: A point within an embankment slope of sand has a total vertical normal stress (σ) of 100 kPa, a total horizontal...
please only answer if you have good personal understanding of
problem. i rate. include relevant drawing and details for
understanding
Problem 8 Consolidated undrained triaxial tests for two similar specimens with different con- solidation stresses were performed and the data in Figure 11.21 is obtained, which includes pore water pressure measurements. Plot Mohr's circles at failure for two specimens in both the total stress and in the effective stress and determine the shear strength parameters c and ф from the...
(12 marks) (a) In a triaxial test for sand (c) the stress increment (s)-2.5o. What is the angle of internal frictica (o (b) A consolidated undrained (CU) triaxial test was performed on two samples of a clay and the results are: Test No. Cell pressure (kNm) Devilo stress ( km) Pore water pressure (kN) G; 1 150 500 220 (i) The Mohe circles and the failure line in terms effective stresses are drwn as shown in the figure below. List...
soil mechanics
will rate if correct
13. A consolidated, undrained (CU) Triaxial test was performed on a normally consolidated, saturated clay. The minor principal effective stress at the end of consolidation phase, c'3c was 100 kPa. The deviatoric stress, Aod, at failure was 60 kPa. The excess pore pressure at failure, Au was 45 kPa. What is the effective friction angle, "? (a) 21 degrees (6) 26 degrees (e) 33 degrees 14. A consolidated, undrained (CU) Triaxial test was performed...
The figure shows an element of soil at the interface between two dry sand layers on a a-32° slope The interface is d=7 m below the ground surface and ror both sand layers the friction angle is φ=30, and Ko= 0.41 Assume that the shear stress is zero on both the vertical and horizontal planes. Va1 (dry unit weight of sand layer 1) - 19 kN/m3 Ys2 (dry unit weight of sand layer 2) 20 kN/m Dry Sand (Yai Dry...
For the soil strata, draw diagrams indicating the total stress, pore pressure and effective stress profiles to the bottom of clay layer. Fine sand has a thickness of 6 m (FST) with saturated unit weight of 18 kN/m2. Clay has a thickness of 8 m with saturated unit weight of 14 kN/m3 The water table is located at depth of 0.7 of fine sand thickness below the ground surface (i.e. depth=0.7*FST). Fine sand will sustain capillarity (suction). Assume the same...
5.1 What is the shear strength in terms of effective stress on a plane within a saturated soil mass at a point where the total normal stress is 295 kPa and the pore water pressure 120 kPa? The strength parameters of the soil for the appropriate stress range are 0 = 30° and c'=12 kPa.
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