This paper presents a new method proposed for the prediction of long t
erm settlement of very heavy structures based on a numerical interpret
ation of long term pressuremeter creep tests. The constitutive model u
sed for the modelling of the soil creep is described. The constants of
the constitutive model are determined by fitting a simulated curve, g
iven by a simple Finite Element Method, to the results of a long term
pressuremeter creep test. The calculation of long term settlement unde
r nuclear power plants, using the soil parameters defined by this meth
od, is presented and compared with the in situ measured values.