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Bearing Capacity

The maximum bearing capacity of a single pile based on the values of tip resistance qc of the ith cone penetration test is given by:

where:

Fmax, i

-

maximum bearing capacity of the pile from ith CPT

Fmax,base,i

-

maximum base resistance from ith CPT

Fmax,shaft,i

-

maximum shaft resistance from ith CPT

If performing the analysis according to the factor of safety or the limit states theory, the bearing capacity of a single pile is obtained as an arithmetic average of n calculated bearing capacities:

If performing the analysis according to EN 1997-2, final bearing capacity depends on correlation factors ξ3 and ξ4.

If performing the analysis according to the NEN 6743 standard then the approach for more CPTs is different and follows directly the NEN 6743 standard (article 5.3.2.2).

The maximum pile base resistance Fmax,base is provided by:

where:

Abase

-

pile base cross-sectional area

pmax, base

-

maximum pressure at pile base from CPT results

The maximum shaft resistance Fmax,shaft is provided by:

where:

Op

-

pile periphery in bearing soil

pmax, shaft

-

maximum force on shaft (friction) from CPT results

ΔL

-

pile length, either length of actived shaft friction or length of expanded base

z

-

vertical dimension alog pile axis

Actual calculation of the maximum pressure at pile base pmax,base and the maximum force developed along the shaft pmax,shaft (determined according to the selected type of analysis selected in the "Pile CPT" tab).