基于正交设计的模型试验相似材料的配比试验研究

在前人相似材料研究的基础上，应用正交设计方法，以（铁粉+重晶石粉）/骨料、铁粉/（铁粉+重晶石粉）、黏结剂浓度、石膏含量为4个因素，每个因素设置5个水平，设计了25组材料配比方案，进行了称重、单轴压缩、劈裂和直剪试验，获得了不同配比相似材料的密度、抗压强度、抗拉强度、弹性模量、泊松比、内摩擦角和黏聚力等物理力学性质指标。试验结果表明：不同配比相似材料的物理力学参数分布的范围较大，能够满足不同性质岩体模型试验对岩体相似材料的要求；采用极差分析法分析了各因素的敏感性，发现（铁粉+重晶石粉）/骨料对试件密度、内摩擦角起主要控制作用，黏结剂浓度对试件的抗压强度、抗拉强度、弹性模量、黏聚力起主要控制作用；并作出了各因素对相似材料物理力学参数影响的直观分析图，分析了各因素对相似材料参数的影响规律。

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

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.