QUESTION 4 For the figure below, what is the expected secondary consolidation se

Question

QUESTION 4 For the figure below, what is the expected secondary consolidation settlement of the clay layer at the building's useful life of 40 years? Assume that the primary consolidation will end in 14 years. The initial void ratio of the compressible clay layer is 1.058 and the coefficent of Secondary Compression, c for this region is 0.007 El. 100.0 m El. 98.5 m El. 96.0 m Water Table 2m X 2m Sand & Gravel = 18.92 KN /m3 El. 92.6 m Compressible Clay =17.10 kN/m3 El. 84.2 m a. 26.8 mm b. 54.2 mm C. 79.4 mm 97.6 mm

Explanation / Answer

SECONDARY CONSOLIDATION :

      > compression due to creep effect and plastic readjustment of particles.

      > It is important in case organic soil and it is negligible in case of other soils.

         Secondary consolidation settlement (Ss) ={ H X Cs X log10(t/tp)} / (1+ep)

           where, ep = void ratio at end of the primary consolidation ( it is not given in the problem ,so take it as zero)

                                                                    = {(92.6 _ 84.2)X0.007Xlog(40/14) }/(1+0)

                                                                    = 0.026808 m =26.808mm

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