a. Briefly explain why short-term undrained conditions are the most critical case for the fill edge slope stability.
a. Briefly explain why short-term undrained conditions are the most critical case for the fill
edge slope stability.
b. Figure 3 shows the approximate existing soil layer profile along the cross section B-B’. It
also shows the proposed location of the fill layer and the edge slope. Divide the clay layer,
FM1, into sublayers for the slope stability analysis. Assign total stress strength parameters
to each sub-layer. Indicate on the soil profile sketch the locations of your clay sublayer
boundaries, and the assumed shear strength for each sublayer. Assign the appropriate
strength to the fill layer.
c. Evaluate the stability of the fill embankment as if it were installed all at once. Do this by
locating a reasonable circle center for a rotational sliding surface. Locate the circle so that the
bottom is tangent to a horizontal line at the mid-depth of the soft clay layer. What is the factor
of safety for this surface? Sketch your answer on a cross section through the embankment and
foundation, showing the circle labeled with its calculated factor of safety.
Please help and give a brief explantion;
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