The tunnel of the previous problem is sunk into a trench


The tunnel of the previous problem is sunk into a trench that has been dredged in the river bottom, and then covered with sand. The volumetric weight of the sand is 20 kN/m3. Determine the minimum cover of sand necessary to prevent floatation of the tunnel.

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Mechanical Engineering: The tunnel of the previous problem is sunk into a trench
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