3. A site is underlain by two soil layers over bedrock. The unit weights of the top (sand) layer are 19 and 21 kN/m3 and the layer is 6 meters thick. The unit weights of the bottom (clay) layer are 20 and 22 kN/m3, and the layer is 8 meters thick. The water table is located 2 meters below the ground surface. The lateral stress ratio of the sand layer is 0.4 and that of the clay layer is 0.5. Determine the effective stress and the shear stress at point A, on a plane oriented 12 degrees clockwise from the horizontal. Use a compass to draw the Mohr Circle neatly. Note: point A is located at a depth of 10m.
3. A site is underlain by two soil layers over bedrock. The unit weights of the top (sand) layer are 19 and 21 kN/m3 and the layer is 6 meters thick. The unit weights of the bottom (clay) layer are 20 and 22 kN/m3, and the layer is 8 meters thick. The water table is located 2 meters below the ground surface. The lateral stress ratio of the sand layer is 0.4 and that of the clay layer is 0.5. Determine the effective stress and the shear stress at point A, on a plane oriented 12 degrees clockwise from the horizontal. Use a compass to draw the Mohr Circle neatly. Note: point A is located at a depth of 10m.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:3. A site is underlain by two soil layers over bedrock. The unit weights of the top (sand) layer are 19 and
21 kN/m3 and the layer is 6 meters thick. The unit weights of the bottom (clay) layer are 20 and 22
kN/m³, and the layer is 8 meters thick. The water table is located 2 meters below the ground surface.
The lateral stress ratio of the sand layer is 0.4 and that of the clay layer is 0.5. Determine the effective
stress and the shear stress at point A, on a plane oriented 12 degrees clockwise from the horizontal.
Use a compass to draw the Mohr Circle neatly. Note: point A is located at a depth of 10m.
5. Consider the profile in problem 3 (above) and draw the plane (in the field; denote the plane's angle of
orientation) on which the magnitude of the effective stress is 60% of the magnitude of the vertical
effective stress. The lateral stress ratio of the sand layer is 0.4 and that of the clay layer is 0.5. Use a
compass to draw the Mohr Circle neatly.
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