Solving Consolidation Pressure: Half Layer of Clay?

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The discussion centers on the calculation of pressure before foundation construction, specifically questioning why the pressure is calculated only for half of the clay layer. The original formula presented includes terms that account for different layers and their respective densities. The user believes that the pressure calculation should consider the full depth of the clay layer instead of just half. There is a request for clarification and guidance on the correct approach to this problem. The conversation highlights a common confusion in geotechnical engineering calculations related to consolidation pressure.
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Homework Statement


I don't understand why the pressure before the construction of foundation is given by (2.5)(16.5) + (0.5)(17.5-9.81) +(1.25)(16-9.81) only ?. Why the pressure is taken only to the half of the layer of clay only ?

Homework Equations

The Attempt at a Solution


I think it's wrong , it should be (2.5)(16.5) + (0.5)(17.5-9.81) +[/B](2.5)(16-9.81) ..Correct me if I am wrong
 

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Anyone has answer ? I seriously think it's wrong. Can anyone guide me ? Thanks in advance !
 
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