Identifying soil compressibility from pressuremeter test

International audienceInverse analysis of pressuremeter tests has been widely used to identify the parameters of low permeability soils assuming the modified Cam-Clay model. In such a case, the simultaneous identification of two parameters (for instance, the consolidation pressure $p_{c0}$ and the critical state parameter M) can be achieved from a single pressuremeter curve obtained in fully drained conditions. Additional experimental information is therefore required to determine the others parameters of the constitutive model. This paper focuses especially on the determination of the plastic compressibility $β$ (where $β=λ−κ$) of prime importance in many engineering problems. Based on sensitivity studies, a procedure to identify simultaneously the plastic compressibility and the parameters $M$ and $p'_{c0}$ is proposed