0.45m Square prestressed concrete piles are to be installed in groups of 4 at the site shown in the figure below. The center-to-center spacing between piles is 2.55 m. - Ground Level Soft Clay Su = 15kPa - Depth =6.7m TP Silty Clay Su = 30kPa 3m Depth = 15.1m 3m Medium Stiff Clay S,-80kPa - Depth = 20.0m a. Calculate group capacity based on individual failure b. Calculate group capacity based on block failure c. Based on parts (a) and (b) above determine the allowable downward load capacity for the pile group. Assume factor of safety of 2.5.

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A:

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A: D(dia of pile) = 400mm = 0.4m Qu = 9 x qpa x Ab + α qsia x As

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Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.