4SCHANZ T, VERMEER P A. On the stiffness of sands[C] ff Pre-Failure Deformation Behaviour of Geomaterials. London: Thomas Telford, 1998 : 383-387.
5SCHANZ T. VERMEER P A, BONNINER P G. The hardening soil model:Formulation and Verifacation[C]///Be- yond 2000 In Computational Geotechnics. Balkema. Rotterdam, 1999 281-297.
6VERMEER P A. Double hardening model for sand[J]. Geotechnique, 1978,28(4) :413-433.
7BENZ T. Small strain stiffness of soils and its numerical consequences[D]. Stuttgart: University of Stuttgart, 2006: 147-149.
8HAJIME M, TERUO N. Stress-deformation and strength characteristics of soil under three different principal stresses[J]. Japan Society of Civil Engineers, 1974,232 (12) : 59-70.
9BENZ T. Small strain stiffness of soils and its numerical consequences[D]. StuttgartUniversityof Stuttgart, 2006: 147-149.
