(Solved): s (b) A soil profile consists of a surface layer of sand 3m thick (=16kN/m3), an intermedia ...

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(b) A soil profile consists of a surface layer of sand $$3\mathrm{m}$$ thick $$\left(?=16\mathrm{kN}/{\mathrm{m}}^3\right)$$, an intermediate clay layer $$2\mathrm{m}$$ thick $$\left({?}_{\text{sat }}=19.25\mathrm{kN}/{\mathrm{m}}^3\right)$$, and a bottom layer of gravel $$4\mathrm{m}$$ thick $$({?}_{\text{sat }}=19\mathrm{kN}/$$ $${\mathrm{m}}^3$$ ). The water table is at the top of the clay layer. Determine the effective stress at various interfaces. There is a surcharge of $$48\mathrm{kN}/{\mathrm{m}}^2$$ on the ground surface. 5