Study on Parameters of Duncan-Chang Model for the Sand in Ma'anshan District of Wanjiang Area

The infrastructure construction is progressing comprehensively owing to economic prosperity in Ma'anshan district of Wanjiang area. The seeking of calculation methods close to engineering practices with simple parameters has become key links in design. The Duncan-Chang constitutive model is widely used in engineering on account of its clear concept and simple calculation procedure. The samples in typical sand layers are selected in Ma' anshan district of Wanjiang area. The shear strength and deformation characteristics of the sand are studied. The calculation parameters of Duncan-Chang model are offered through laboratory test. The finite element program of Duncan-Chang constitutive model is developed. Numerical calculation of the sand is carried out for three stages of self-weight stress equilibrium, isostatic consolidation and axial strain shear failure based on Duncan-Chang model. Researches show that:the parameters of Duncan-Chang model are correct, and it can be used to analyze the settlement and stability of sand foundation in Wanjiang Area by finite element method.