(a) List the advantages and limitations of the direct shear box test. [4 marks] (b) The...
(a) List the advantages and limitations of the direct shear box test.
[4 marks]
(b) The following results were obtained from an unconsolidated, undrained triaxial test on an undisturbed sample of clay.
|
Sample |
Cell pressure (kN/m2) |
Strain at failure (%) |
Deviator stress at failure (kN/m2) |
|
A |
100 |
10.0 |
166 |
|
B |
200 |
9.0 |
170 |
|
C |
400 |
8.0 |
182 |
Plot the Mohr’s Circles for the results and determine the appropriate shear strength parameters of the clay.
[14 marks]
Homework Answers
Add Answer to:
(a) List the advantages and limitations of the direct shear box
test.
[4 marks]
(b) The...
(a) Briefly explain Mohr-Coulomb theory and show how we can determine the shear strength parameters of...
(a) Briefly explain Mohr-Coulomb theory and show how we can determine the shear strength parameters of soil by plotting the shear stress versus normal stress. [3 marks] The following results were obtained from a consolidated undrained Triaxial (CU) test with pore water pressure measurement on three samples of a fully saturated clay. Determine the total (undrained) stress and effective (drained) stress parameters. [12 marks] Sample Cell pressure (kN/m2) Deviator stress at failure (kN/m2) Pore pressure at failure (kN/m2) A 300...
Question 4 A sample of soft silty clay from the Thames Estuary is taken from the...
Question 4 A sample of soft silty clay from the Thames Estuary is taken from the ground, trimmed to a cylindrical specimen and then placed into a triaxial cell. The sample is compressed isotropically under drained conditions by increasing the cell pressure in the triaxial cell to 450 kN/m², with a back (pore) pressure of 200 kN/m2. At the end of the compression stage the sample is calculated to have dimensions of length = 74.03 mm and diameter = 37.17...
Question 4(Shear Strength) Note: Part a) and b) must be answered on GRAPIT PAPERI A series...
Question 4(Shear Strength) Note: Part a) and b) must be answered on GRAPIT PAPERI A series of conventional triaxial compression tests were conducted on three identical samples of a cohesionless soil. Test results are tabulated as follows: Sample Effective Confining Pressure, 0' (kN/m?) 198.8 347.9 280.0 Principal Stress Difference at Failure, Ag (kN/m2) 596.4 1043.7 a) Draw the Mohr's circles for the soil samples A and B in terms of effective stresses. [10 marks) b) By drawing the Mohr-Coulomb failure...
2.If an additional CU triaxial test with pore pressure measurement is to be performed using a...
2.If an additional CU triaxial test with pore pressure
measurement is to be performed using a ?3 of 250 kPa on a specimen
identical to those in last Problem , estimate the deviator stress
(?d) and pore pressure (u) of this additional test at failure. What
would potentially be orientation of the failure plane in the
specimen?
The results below were obtained at failure in a series of consolidated-undrained (CU) triaxial tests, with pore pressure measurement, on specimens of fully...
A direct shear test, when conducted on a remolded sample of clay, gave the following data...
A direct shear test, when conducted on a remolded sample of clay, gave the following data at the time of failure: of = 189.1 kN/m2 os = 63.8 kN/m2 C = 11.6 kN/m2 Diameter of soil sample = 5 cm (cylindrical sample) Height of soil sample = 3 cm A. Draw the Mohr Circle and show the essential values on that. SA B. Determine the angle of internal friction. C. Determine the normal and shear forces at the tirhe of...
(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...
2. A consolidated undrained triaxial test, in which pore pressure measurements were made, was carried out...
2. A consolidated undrained triaxial test, in which pore pressure measurements were made, was carried out on a saturated soil with the following results. Given that the initial diameter of the sample was 38 mm in all three cases, determine the values of cohesion and angle of internal friction with respect to (a) total stresses (c and o). (b) effective stresses (c' and o'). The minor and major principal stresses are calculated and presented in the table below (You are...
The following results were obtained from an undrained shear box test carried out on a set...
The following results were obtained from an undrained shear box test carried out on a set of undisturbed soil samples. 0.2 0.8 Normal Load (N) Strain (%) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 21 46 70 89 107 121 131 136 138 138 137 136 0.4 Shearing force (N) 0 33 72 110 139 164 180 192 201 210 217 224 230 234 237 236 0 45...
The following results were obtained from an undrained shear box test carried out on a set...
The following results were obtained from an undrained shear box test carried out on a set of undisturbed soil samples. 0.2 0.8 Normal Load (N) Strain (%) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 21 46 70 89 107 121 131 136 138 138 137 136 0.4 Shearing force (N) 0 33 72 110 139 164 180 192 201 210 217 224 230 234 237 236 0 45...
Question 4 A sample of soft silty clay from the Thames Estuary is taken from the ground, trimmed to a cylindrical specimen and then placed into a triaxial cell. The sample is compressed isotropically under drained conditions by increasing the cell pressure in the triaxial cell to 450 kN/m², with a back (pore) pressure of 200 kN/m2. At the end of the compression stage the sample is calculated to have dimensions of length = 74.03 mm and diameter = 37.17...
Question 4(Shear Strength) Note: Part a) and b) must be answered on GRAPIT PAPERI A series of conventional triaxial compression tests were conducted on three identical samples of a cohesionless soil. Test results are tabulated as follows: Sample Effective Confining Pressure, 0' (kN/m?) 198.8 347.9 280.0 Principal Stress Difference at Failure, Ag (kN/m2) 596.4 1043.7 a) Draw the Mohr's circles for the soil samples A and B in terms of effective stresses. [10 marks) b) By drawing the Mohr-Coulomb failure...
2.If an additional CU triaxial test with pore pressure
measurement is to be performed using a ?3 of 250 kPa on a specimen
identical to those in last Problem , estimate the deviator stress
(?d) and pore pressure (u) of this additional test at failure. What
would potentially be orientation of the failure plane in the
specimen?
The results below were obtained at failure in a series of consolidated-undrained (CU) triaxial tests, with pore pressure measurement, on specimens of fully...
A direct shear test, when conducted on a remolded sample of clay, gave the following data at the time of failure: of = 189.1 kN/m2 os = 63.8 kN/m2 C = 11.6 kN/m2 Diameter of soil sample = 5 cm (cylindrical sample) Height of soil sample = 3 cm A. Draw the Mohr Circle and show the essential values on that. SA B. Determine the angle of internal friction. C. Determine the normal and shear forces at the tirhe of...
(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...
2. A consolidated undrained triaxial test, in which pore pressure measurements were made, was carried out on a saturated soil with the following results. Given that the initial diameter of the sample was 38 mm in all three cases, determine the values of cohesion and angle of internal friction with respect to (a) total stresses (c and o). (b) effective stresses (c' and o'). The minor and major principal stresses are calculated and presented in the table below (You are...
The following results were obtained from an undrained shear box test carried out on a set of undisturbed soil samples. 0.2 0.8 Normal Load (N) Strain (%) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 21 46 70 89 107 121 131 136 138 138 137 136 0.4 Shearing force (N) 0 33 72 110 139 164 180 192 201 210 217 224 230 234 237 236 0 45...
The following results were obtained from an undrained shear box test carried out on a set of undisturbed soil samples. 0.2 0.8 Normal Load (N) Strain (%) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 21 46 70 89 107 121 131 136 138 138 137 136 0.4 Shearing force (N) 0 33 72 110 139 164 180 192 201 210 217 224 230 234 237 236 0 45...
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