A capped pile group consisting a rectangular grid of 7 by 3 spanning a total length...

A capped pile group consisting a rectangular grid of 7 by 3 spanning a total length of, 7.1 m in length. Piles are of size 400 mm diameter and spaced at 1.8 m interval. The soil profile at the site consists of 2.5 m of sand followed by clay soil below. Drive Method construction method would be used. Field and laboratory data on the soil profile indicates top layer shear strength of N = 25. Average and strength for bottom layer are Cu = 265 kPa and Cu = 290 kPa. Adhesion factor between soil and pile is 0.9. Would you recommend using the piles as a group or singles?

Part A: Show your working for the following

Pile Group Design

Tip of base Area A_b (m²)=
Base Perimeter P (m) =
Ultimate bearing capacity q_f =
Tipt resistance (kN) =
Layer 1 Shaft Resistance (kN) =
Layer 2 Shaft Resistance (kN) =
Ultimate Load Q_f (kN) =

Part B: Show your working for the following

Single Pile Design

Ultimate bearing capacity qf (kPa) =
Tipt resistance (kN) =
Layer 1 Shaft resistance (kN) =
Layer 2 Shaft resistance (kN) =
Ultimate Load Qf (kN) =
Pile group efficiency (%) =
Spacing criteria satisfied? (Yes/No)
Use Piles as (Single/Group) =

Expert Solution

Notation used are standard notation.

Ally Wells answered 10 months ago

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