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Schmertmann

The Schmertmann method determines the maximum pressure at pile base pmax, base as follows:

where:

αp

-

pile base coefficient

qupr

-

modified equivalent average cone tip resistance

where:

qc1, qc2

-

minimum value of mean of the cone tip resistance

In cohesionless soils the analysis takes into account the influence of overconsolidation (OCR).

The maximum shaft friction pmax,shaft is given by following formulas:

  • for cohesionless soils:

where:

K

-

correlation coefficient of skin friction

-

mean value of penetrometer sleeve local friction fs in the interval given by bracket subscript

As

-

area of the pile shaft surface in given interval

d

-

diameter of pile

D

-

embedded pile length

  • for cohesive soils:

where:

αs,i

-

shaft friction coefficient according Tomlinson in the ith layer

-

mean value of penetrometer sleeve local friction fs in the ith layer

As,i

-

area of the pile shaft surface in the ith layer

Literature:

Schmertmann J.H.: Guidelines for Cone Penetration Test, Performance and deign, U.S. Departments of Transportation, report No. FHWA-TS-78-209, Washington,D.C., 1978.