Research on similar material proportioning test of model test based on orthogonal design

Abstract

On the basis of previous research of similar material,the weight ratio of iron ore powder plus barite powder to aggregates,the weight ratio of iron ore powder to iron ore powder plus barite powder,adhesive concentration and gypsum content were selected as four factors,and every factor had five variable levels.According to twenty five schemes of material mixture ratio designed by orthogonal design method,laboratory uniaxial compression test,split test and direct shear test were conducted.Physical and mechanical indexes of similar material such as unit weight,compressive strength,tensile strength,elastic modulus,poisson ratio,internal friction angle and cohesion were obtained under different material mixture ratios.The tests results show that physical and mechanical indexes of similar material vary in a large range and can meet the needs for rock similar material in different physical model test of rock slope.The sensitivity of every factor was analyzed by using extremum difference method.The results show that the weight ratio of iron ore powder plus barite powder to aggregates has control effect on density and internal friction angle of the specimen,and adhesive concentration has control effect on compressive strength,tensile strength,elastic modulus and cohesion of the specimen.The relationship between factors and parameters of similar material were studied by direct analysis charts of the factors affecting physical and mechanical indexes of the material.