8/19/2019 DIN Pile Lateral Group Efficiency

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DIN 1054:2005 - 01 ANNEX E

Prepared By: P. Suresh Kumar Gupta Project: ZADCO - PE103 Date: 20th Nov 2013

Number of Piles in Group 4

Diameter of Bored Cast in-situ Pile Ds 0.75 m

Pile Group Efficiency

Where, αi = αL * αQA OR αi = αL * αQZ

αL = 0.25 + 0.125*(aL /Ds) < 1.00

αQA = 0.7 + 0.1*(aQ /Ds) < 1.00

αQZ = 0.25 + 0.25*(aQ /Ds) < 1.00

Summary of Results for Equal Spacing on Both Sides

Spacing to Dia

Ratio

Pile Spacing

(aL)αL αQA αL * αQA

Leading Piles

Capacity (%)

Trailing piles

Capacity (%)

Overal Usage

%

2.50 1.875 0.563 0.950 0.534 95.0 53.4 74.2

2.75 2.063 0.594 0.975 0.579 97.5 57.9 77.73.00 2.250 0.625 1.000 0.625 100.0 62.5 81.3

3.25 2.438 0.656 1.000 0.656 100.0 65.6 82.8

3.50 2.625 0.688 1.000 0.688 100.0 68.8 84.44.00 3.000 0.750 1.000 0.750 100.0 75.0 87.54.25 3.188 0.781 1.000 0.781 100.0 78.1 89.14.50 3.375 0.813 1.000 0.813 100.0 81.3 90.65.00 3.750 0.875 1.000 0.875 100.0 87.5 93.86.00 4.500 1.000 1.000 1.000 100.0 100.0 100.0

=⅀α

α

2

aL

1

aQ 

4

3