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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
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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--- ### Triaxial Test Analysis A 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 = 381 From 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
Transcribed Image Text:--- ### Triaxial Test Analysis A 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 = 381 From 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
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