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Please show work on how to get the answer. The results of four drained direct shear tests on samples of overconsolidated clay are given below. (a) Determine the drained shear strength parameters,...
8- An overconsolidated clay has the following shear strength parameters C 20 KPa, 15° in the...
8- An overconsolidated clay has the following shear strength parameters C 20 KPa, 15° in the overconsolidated rang C'-0,0 30°in the normally consolidated rang a) What is the preconsolidation pressure of this clay? b) Would the clay fail under the following stress conditions (why)? 1-0',-5 kPa, o", 75 Kpa 2-0',-60 kPa , o",-170 kPa c) What is the shear strength of the clay at effective normal stress of 100 kPa?
(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...
puit (u) and not T 3lear stress. 7-13 Two similar samples of a very dense saturated cohesionless soil are to be shear tested under drained and undrained conditions. How should the shearing resist...
puit (u) and not T 3lear stress. 7-13 Two similar samples of a very dense saturated cohesionless soil are to be shear tested under drained and undrained conditions. How should the shearing resistance from these two tests compare and why? What if the soil was initially very loose? 7- 14 Shear strength tests conducted on samples of a highly overconsolidated clay resulted in lower strengths for CD tests than for CU tests. Ilustrate this behavior by plotting typical Mohr's circles...
eslblem 2 25 pt)oe Two triaxial compression tests are conducted on identical specimens of the same...
eslblem 2 25 pt)oe Two triaxial compression tests are conducted on identical specimens of the same saturated clay. In the first test the soil is first consolidated to ?.-350 kPa and u.-200 kPa and then sheared under drained conditions increasing the axial stress while keeping the chamber pressure constant. At failure ?i 560 kPa. In the second test, the specimen is consolidated to ?.-600 kPa and uo-400 kPa, then it is sheared under undrained conditions increasing the axial stress while...
PART IV SHEAR STRENGTH OF SOILS 38 pts PROBLEM 4.1 a) A triaxial consolidated drained test...
PART IV SHEAR STRENGTH OF SOILS 38 pts PROBLEM 4.1 a) A triaxial consolidated drained test is performed on a NC clay with ?.-700 kPa and uo-200. The additional axial stress applied through the piston during the shear phase is 1130 kPa. What is the angle of internal friction of the clay (assume c'-0)? Draw total and effective stress Mohr circles for pre-shear and failure conditions. Indicate position of failure plane b) A duplicate specimen is tested undrained following identical...
A series of three Direct Shear Tests have been conducted on a certain soil type. The...
A series of three Direct Shear Tests have been conducted on a certain soil type. The tests were performed on a circular 10 cm-diameter soil sample. The results of these tests taken at the peak failure stress are as follows: Normal Load Shear Load Normal Stress | Shear Stress Test Number (kN) (kN) (kPa) (kPa) 1.178 0.785 1.963 1.374 2.356 256 1.571 a) Use the space provided below to plot the failure envelope and obtain the shear strength parameters. T...
12.4 During a subsoil exploration program, undisturbed normally consolidated silty clay samples were collected in Shelby...
12.4 During a subsoil exploration program, undisturbed normally consolidated silty clay samples were collected in Shelby tubes. Following are the results of four drained, direct shear tests conducted on the clay samples with each having a diameter of 63.5 mm and height of 32 mm. Test no. 1 Normal force (N) 84 168 254 360 Shear force at failure (N) 28.9 59.6 89.1 125 a) Graph shear stress at failure vs. normal stress (10 points) b) Determine the drained angle...
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...
Problems 39 ist four major factors that influence the internal friction angle of cohesionless soils 7-2 Define soil sensitivity and thixotropy In a direct shear test on a loose sand, a shearing s...
Problems 39 ist four major factors that influence the internal friction angle of cohesionless soils 7-2 Define soil sensitivity and thixotropy In a direct shear test on a loose sand, a shearing stress of 36.1 kPa was recorded 7-3 while the normal stress on the failure plane was 66.4 kPa. (a) What are the shear strength parameters, c', φ'? (b) Find the major and minor principal stresses at failure. (c) Determine the shear strength at a normal stress of 110.0...
A drained direct shear box test was performed on a sample of saturated sand. The normal...
A drained direct shear box test was performed on a sample of saturated sand. The normal effective stress of 467 kPa was constant throughout the test, and the initial sample dimenstions were 60 mm x 60 mm in plan x 30 mm deep. In the vicinity of peak shear stress, the data recorded were: (20 points) Shear Stress, τ (kPa) 42.5 43.1 42.8 Relative horizontal displacement x (mm) 0.30 0.40 0.80 Upward movement of the shear box cap y (mm)...
8- An overconsolidated clay has the following shear strength parameters C 20 KPa, 15° in the overconsolidated rang C'-0,0 30°in the normally consolidated rang a) What is the preconsolidation pressure of this clay? b) Would the clay fail under the following stress conditions (why)? 1-0',-5 kPa, o", 75 Kpa 2-0',-60 kPa , o",-170 kPa c) What is the shear strength of the clay at effective normal stress of 100 kPa?
puit (u) and not T 3lear stress. 7-13 Two similar samples of a very dense saturated cohesionless soil are to be shear tested under drained and undrained conditions. How should the shearing resistance from these two tests compare and why? What if the soil was initially very loose? 7- 14 Shear strength tests conducted on samples of a highly overconsolidated clay resulted in lower strengths for CD tests than for CU tests. Ilustrate this behavior by plotting typical Mohr's circles...
eslblem 2 25 pt)oe Two triaxial compression tests are conducted on identical specimens of the same saturated clay. In the first test the soil is first consolidated to ?.-350 kPa and u.-200 kPa and then sheared under drained conditions increasing the axial stress while keeping the chamber pressure constant. At failure ?i 560 kPa. In the second test, the specimen is consolidated to ?.-600 kPa and uo-400 kPa, then it is sheared under undrained conditions increasing the axial stress while...
PART IV SHEAR STRENGTH OF SOILS 38 pts PROBLEM 4.1 a) A triaxial consolidated drained test is performed on a NC clay with ?.-700 kPa and uo-200. The additional axial stress applied through the piston during the shear phase is 1130 kPa. What is the angle of internal friction of the clay (assume c'-0)? Draw total and effective stress Mohr circles for pre-shear and failure conditions. Indicate position of failure plane b) A duplicate specimen is tested undrained following identical...
A series of three Direct Shear Tests have been conducted on a certain soil type. The tests were performed on a circular 10 cm-diameter soil sample. The results of these tests taken at the peak failure stress are as follows: Normal Load Shear Load Normal Stress | Shear Stress Test Number (kN) (kN) (kPa) (kPa) 1.178 0.785 1.963 1.374 2.356 256 1.571 a) Use the space provided below to plot the failure envelope and obtain the shear strength parameters. T...
12.4 During a subsoil exploration program, undisturbed normally consolidated silty clay samples were collected in Shelby tubes. Following are the results of four drained, direct shear tests conducted on the clay samples with each having a diameter of 63.5 mm and height of 32 mm. Test no. 1 Normal force (N) 84 168 254 360 Shear force at failure (N) 28.9 59.6 89.1 125 a) Graph shear stress at failure vs. normal stress (10 points) b) Determine the drained angle...
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...
Problems 39 ist four major factors that influence the internal friction angle of cohesionless soils 7-2 Define soil sensitivity and thixotropy In a direct shear test on a loose sand, a shearing stress of 36.1 kPa was recorded 7-3 while the normal stress on the failure plane was 66.4 kPa. (a) What are the shear strength parameters, c', φ'? (b) Find the major and minor principal stresses at failure. (c) Determine the shear strength at a normal stress of 110.0...
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