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Approach According to Masopust

The load-settlement curve of single pile is constructed in the following way:

1) The ultimate skin friction qs is determined as follows:

where:

a,b

-

regression coefficient of the specific skin friction

vi

-

depth from terrain up to the middle of the ith layer [m]

di

-

pile diameter in the ith layer [m]

and pile skin bearing capacity is the provided by:

where:

m1

-

load type coefficient

m2

-

shaft protection coefficient

di

-

pile diameter in the ith layer [m]

hi

-

thickness of the ith layer [m]

qsi

ultimate skin friction in the ith layer [MPa]

2) The pile base bearing capacity qb follows from:

where:

e, f

-

regression coefficients below pile base

D

-

pile length inside soils [m]

db

-

pile base diameter [m]

3) The proportion of applied load transferred to pile base β is written as:

where:

qb

-

pile base bearing capacity [MPa]

-

weighted average of ultimate skin friction [MPa]

D

-

pile length inside soils [m]

db

pile base diameter [m]

The load at mobilization of skin friction Rsy is then given by:

where:

Rs

-

pile skin bearing capacity [N]

β

-

proportion of applied load transferred to pile base [-]

4) The load at the shaft resistance activation (= mobilization of skin friction) Rsy is given by:

where:

Is

-

settlement-influence factor

Rsy

-

load at the mobilization of skin friction [N]

d

-

pile diameter [m]

Es

-

secant modulus of soil along the pile shaft [MPa]

5) The load at the pile base for the prescribed settlement (for limiting settlement of  25 mm) follows from:

where:

β

-

proportion of applied load transferred to pile base [-]

Rsy

-

load at the mobilization of skin friction [N]

slim

-

limit settlement (usually prescribed as 25 mm) [m]

sy

settlement at shaft resistance activation [m]

and the pile resistance attributed to a given limit settlement slim is then provided by:

where:

Rb,lim

-

load on pile base for prescribed settlement [N]

Rs

-

pile shaft resistance [N]

Approach according to Masopust

Literature:

Masopust, J.: Vrtane piloty. 1st edition, Prague, Cenek a Jezek, 1994, 263 p.

Masopust, J., Glisnikova, V.: Zakladani staveb Modul M01. 1st edition, Brno, AN CERM, 2007, 182 p., ISBN 978-80-7204-538-9.