stress yield
8.The same homogeneous dam with 100 m height was calculated using Duncan E B and double yield surface models, the results is that the distributions of displacement and stress of rockfill body are same, but the values of displacement and stress of Duncan model are lager than double yield surface one.
9.An experimental investigation on the yield behaviour of polycrystalline photoplastic material-AgCl under uniaxial and biaxial stress state has been carried out. The ini- tial yield locus of AgCl in σ_1σ_2 plane is presented. The experimental data are provided for deep understanding the yield behaviour of AgCl and its possible applications in practical problems.

