Question $9$:

$($Value: $24$ marks$)$

Using the strain influence factor method suggested by Schmertman, determine the elastic settlement of the foundation constructed for a condominium complex. The variation of modulus of elasticity, $E_s$ with respect to depth and other information are shown in Figure $5.$ The unit weight of soil, $=20k\frac{N}{m^3}$ and a creep time $=5$ years for the correction factor $C_2.$ It was proposed to construct $10$ more storeys onto the existing condominium complex. What will be your recommendations with respect to this foundation? Would it be safe to construct another ten storeys? $($Hint$\text{'}$s: Think about the overall stress that will increase at the base of foundation due to the construction of extra ten storeys. You may assume approximately a load of $10$kPa for each storey. In addition, it may not be a bad idea to increase the creep period too$).$

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