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GEO5

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Bearing Capacity

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

where:

Fmax,i

-

maximum bearing capacity of the pile from ith CPT test

Fmax,toe,i

-

maximum toe resistance from ith CPT test

Fmax,shaft,i

-

maximum shaft resistance from ith CPT test

Providing there is n CPT tests then the bearing capacity of a single pile is obtained as an arithmetic average of n calculated bearing capacities:

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

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

where:

Atoe

-

pile toe cross-sectional area

pmax, toe

-

maximum pressure at pile toe 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 toe

z

-

vertical dimension alog pile axis

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