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ENGIN 3202 - Geotechnical engineering
It is proposed to construct a multi storeyed office building complex at a site. A detailed geotechnical site investigation has been carried out at this block of land to identify the important geotechnical characteristics required for the design of Foundations. Out of the several boreholes advanced at the site, soil profile at Borehole BH1 is shown below in Figure 1. Results of field and laboratory tests are also shown below in Figure 1 and Table 1.
(a) Using statics (that is α method and β method)
both TSA (Total Stress Analysis) and ESA (Effective Stress Analysis)
α – Method: (Total stress method)
Assume, Diameter of pile = 0.5 m & Depth of pile = 6 m.
According to API 1984,
α = 1 Su < 25 KPaα – skin friction factor
α = 0.5 Su > 70 KP Su – Undrained shear strength
α = KPa
For Su = 80 KPa, α = 0.5
For Su = 61 KPa,