In order to study the physical and mechanical properties of two kinds of tailing sands produced by hydrocyclone classifier under central line damming method

the physical and mechanical properties of two kinds of sample in Dexing copper mine tailing dam were tested and analyzed through a series of indoor soil tests.The comprehensive physical and mechanical properties indexes and Duncan-Chang model parameters were obtained.The results show that

the underflow tailing sands have better permeability

lower compressibility

higher shear strength and greater static stability compared to the overflow tailing sands.The results not only can provide the basic data for subsequent dynamic analysis and numerical calculation

but also can provide reference for the study of engineering mechanics properties of the same kind of tailing sands.