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Cohesive Soil (Analysis for Undrained Conditions)

The bearing capacity of an earth block is provided by:

where:

l

-

length of piles

bx,by

-

plane dimensions of the base of an earth body in the form of a block

cus

-

average undrained shear strength along the piles ()

cub

-

undrained shear strength at the base of piles

Ncg

-

cohesion group bearing capacity factor

where:

for condition:

for condition:

where:

bx

-

minimum width of pile group (shorter layout size of the pile cap)

Note: The earth body is represented by a block with its base given by a plane containing feet of individual piles and having vertical walls found in the distance of one pile diameter from the axes of outer piles. This earth block subjected to overall load caused by the pile group resists by shear along the walls - skin friction and by bearing capacity at its base.

The actual verification analysis is carried out according to the factors of safety or the theory of limit states.