Question

Efficiency of a pile group is defined as

• A. $\frac{Loadcarriedbythelargestpileinthegroup}{Loadcarriedbythesmallestpileinthegroup}$
• B. $\frac{Maximumloadcarriedbyapileinthegroup}{Minimumloadcarriedbyapileinthegroup}$
• C. $\frac{Minimumloadcarriedbyapileinthegroup}{Maximumloadcarriedbyapileinthegroup}$
• D. $\frac{Averageloadcarriedbyapileinthegroup}{Loadcarriedbyasinglepile}$

Answer 1

The correct option is D $\frac{Averageloadcarriedbyapileinthegroup}{Loadcarriedbyasinglepile}$

The efficiency of pile group depends on the following factors:

1. Spacing of piles
2. Total number of piles in a row and number of rows in a group and
3. Characteristics of pile (material, diameter and length)

The efficiency of the pile group can be calculated by using the following formula:

${\eta }_g=\frac{Q_{g\left(u\right)}}{N{Q}_u}\times 100$

Thus, the pile group efficiency is equal to the ratio of the average load per pile in the group at which the failure occurs to the ultimate load of a comparable single pile.