^pLaboratory;
of;
Geo-mechanics;
and;
Embankment;
Engineering;
of;
Ministry;
of;
Education,;
Hohai;
University,;
Nanjing;
210098,;
China;
^pResearch;
Institute,;
Hohai;
University,;
Nanjing;
210098,;
China;
^pde;
Mecanique;
de;
Lille,;
UMR;
CNRS;
8107,;
Equipe;
Mecanique;
des;
Geomateriaux;
Coherents,;
Polytech'Lille,;
Cite;
Scientifique,;
59655;
Villeneuve;
d'Ascq,;
France;