---### Triaxial Test AnalysisA series of consolidated-drained (CD) triaxial tests were performed on soil samples with the same initial density. Each test was continued until failure. The following data was recorded:| Test Number | σ₃' (kPa) | σ₁' (kPa) ||-------------|------------|------------|| 1 | 200 | 570 || 2 | 300 | 875 || 3 | 400 | 1162 |Plot the relevant Mohr stress circles and determine the effective/drained shear strength parameters.**Explanation for Graphs/Diagrams:**The data provided must be used to plot Mohr stress circles. The circles should be plotted with the normal stress (σ) on the x-axis and shear stress (τ) on the y-axis. Each circle represents the state of stress at failure for different tests:1. **Test 1:** - Center: ((σ₁' + σ₃') / 2, 0) = ((570 + 200) / 2, 0) = (385, 0) - Radius: (σ₁' - σ₃') / 2 = (570 - 200) / 2 = 185 2. **Test 2:** - Center: ((σ₁' + σ₃') / 2, 0) = ((875 + 300) / 2, 0) = (587.5, 0) - Radius: (σ₁' - σ₃') / 2 = (875 - 300) / 2 = 287.5 3. **Test 3:** - Center: ((σ₁' + σ₃') / 2, 0) = ((1162 + 400) / 2, 0) = (781, 0) - Radius: (σ₁' - σ₃') / 2 = (1162 - 400) / 2 = 381From these plots, the effective cohesion (c') and effective angle of internal friction (φ') can be determined by drawing the tangent to the Mohr circles at failure. The tangent line's y-intercept will give the effective cohesion, while the angle θ formed with the x

Results of the consolidated drained test

A series of consolidated-drained (CD) triaxial tests were performed on the soil with same initial density. Each test was continued until failure. Following data was recorded. Test Number 1 2 3 03' (kPa) 200 300 400 0₁' (kPa) 570 875 1162 Plot the relevant Mohr stress circles and determine effective/drained shear strength parameters.

A series of consolidated-drained (CD) triaxial tests were performed on the soil with same initial density. Each test was continued until failure. Following data was recorded. Test Number 1 2 3 03' (kPa) 200 300 400 0₁' (kPa) 570 875 1162 Plot the relevant Mohr stress circles and determine effective/drained shear strength parameters.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Give the correct option In a drained triaxial test on consolidated clay the stress and angle are as follows: Deviator stress is 20 lb/in2 and friction angle is 21°. Calculate the effective confining pressure at failure?a) 21 lb/in2 b) 22.2 lb/in2 c) 25.4 lb/in 2 d) 17.9 lb/in2
The results of two consolidated drained triaxial tests are as follows: Test a, (kN/m²) Ar,(kN/m²) 66 91 134.77 169.1 Determine c and o. Also determine the magnitudes of the normal and shcar stress on the planes of failure for the two specimens used in the tests.
a consolidated tri-axial test was conducted on a normally consolidated clay. the results were as follows: chamber confining pressure = 316 kPa, deviator stress = 424 kPa. compute for the shear stress on the failure plane in kPa.
To determine the strength properties of a clay soil, a series of consolidated–undrained direct shear tests is performed. For the first test, the normal pressure is 36 kPa and the sample fails when the shear stress is 21.6 kPa. The second sample is tested under a normal load of 72 kPa, and failure occurs when the shear stress is 24 kPa. A third sample is tested under a normal loading of 120 kPa, and failure occurs when the shear stress is 38.4 kPa. From these data, estimate the cohesion of the soil in the in situ condition and the value of fCU.
A triaxial test is performed on a normally consolidated clay. The sample is further consolidated by the test of all-around confining pressure prior to application of the axial load. The axial force is then applied very slowly. The equipment pore pressure lines remain open so that drainage of soil pore water can occur during the test. (The described conditions outline the procedure for a consolidated–drained-type test.) The sample fails (shears) when the σ3 pressure is 21 kPa and the s1 value is 61 kPa. From these data, determine the angle of internal friction for the effective stress strength–failure envelope (that is, determine fCD).
Water at 10°C has a kinematic viscosity of 1.30 X 10-6 m2/s flows at the rate of 895.55 L/min from the reservoir and through the pipe shown in the Fig. below. Compute the pressure at point B, considering the energy loss due to friction, but neglecting other losses. Also, use pipe roughness of 1.50 X 10-6 m. Hint: Use the appropriate formula to determine the friction factor, f to 4 decimal places (flow type dependant); g = 9.81 and round off to 3 decimal places for all other step calculations leading to the final answer including the final answer.
ans. key : 16.8 kPa
4. A sandy soil sample was subjected to a consolidation pressure of 100 kPa and Consolidated drained test was conducted on it. The failure plane angle which the sample made at failure with respect to horizontal was 60°. Find the vertical stress at failure. If instead of increasing the vertical stress, it was decreased gradually, explain why the sample would fail. Obtain the shear and normal stress at failure for both of these conditions.
A consolidated tri-axial test was conducted on a normally consolidated clay. The results were as follows: Chamber confining pressure = 346 kPa, Deviator stress = 403 kPa. Compute for the shear stress on the failure plane in kPa. Round off to two decimal places.
A consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 115 kPa, Deviator stress at failure = 81 kPa, Pore Water Pressure = 62 kPa. These results were used to determine the drained friction angle of the soil. Compute the deviator stress (kPa) at failure when the drained test was conducted with the chamber confining pressure changed to 159 kPa. Round off to two decimal places.
A consolidated drained tri-axial test was conducted on normally consolidated clay. The results were: the confining pressure is 300 kPa and the deviators stress is 300 kPa. Compute the angle of shearing resistance.
q.1Explain the stresses applied to the soil sample during the triaxial test. B) How do we apply confining pressure to the soil specimen during the triaxial test.?