Explain about void ratio drops, Civil Engineering

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A clay layer 25 metres thick has a saturated unit weight of 19.2 kN/m². Ground water level occurs at a depth of 5 metres. It is proposed to construct a reinforced concrete foundation, 12.5 m × 50 m, on top of the layer, to transmit a uniform pressure of 150 kN/m².

Verify the settlement at its centre, suppose that the void ratio drops from 0.725 to 0.700 due to loading. E for the clay is 30 MN/m².

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