[기초공학]기초공학 리포트 다섯번째

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1. A 355.6mm steel pipe pile (wall thickness: 11.1mm) is drievn 15m into overconsolidated clays having the following properties: From zero to 6m depth the cohesion is 70kPa and the unit weight of the soil is 17.2kN/m3; below 6m, the cohesion is 120kPa and the unit weight is 18.9kN/m3. The inside of the steel pipe pile is to be filled with a concrete. Calculate the allowable upward axial capacity of the pile.

3. A steel pipe pile (outside diameter 355.6mm; wall thickness 11.1mm) is driven by an MKT S-20 hammer. The length of the pile is 25m, the weight of the pile cap is 21.5kN, the hammer efficiency is 0.84, and the number of blows for the last 2.5cm of penetration is 10. Wood cushion is used for the pile driving. Determine the ultimate bearing capacity of the pile by using the modified ENR formula and Hiley`s formula.

4. For a 4x5 group pile in sand, the piles are circular in cross section and have an outside diameter of 460mm. Plot a relationship between the pile spacing and the group efficicency by varying the c.t.c. spacing 1D to 5D based on both the theoretical equation and Converse-Labarre`s equation.

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