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If the surface grade is lowered, what is the results in the subsurface stresses?

If the surface grade is lowered, what is the results in the subsurface stresses?

Engineering   Civil-Engineering   
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Answer #1

Since it is not specifically mentioned I am assuming that b subsurface stresses it is meant for subsurface stresses in soil.

Now let us analyze the effect of lowering of the surface grade:

So, as we can see due to lowering of the surface grade effective stress gets reduced.

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