均匀设计在物理模型试验相似材料配比试验中的应用

在物理模型试验中,相似材料的配制及试验对模型试验的成功与否具有重要的作用.基于均匀设计方法,以松香含量、砂∶重晶石粉、铁粉含量、石膏含量作为正交设计的4个因素,每个因素设置6个水平,设计了6组材料配比方案,进行了室内单轴压缩、劈裂和直剪试验,获得了不同配比相似材料的容重、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指标.结果表明,配制的相似材料的物理力学参数覆盖的范围较大,能够满足不同岩体性质物理模型试验对相似材料的要求;结合工程实例,基于相似材料试验结果,进行了物理模型试验的设计和相似材料配比方案的选择.

Application of Uniform Design in Similar Material Proportioning Test of Physical Model Test

The proportioning test of similar material plays a very important role in the physical model test. Based on the method of uniform design, the rosin weight, the weight ratio of soil and barite powder, iron ore powder weight and plaster weight were selected as four factors, and every factor had six variable levels. According to six schemes of material mixture ratio designed, 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. Tests results showed that physical and mechanical indexes of similar material varied in a large range and could meet the needs for rock similar material in different physical model test of rock slope. Combined with practical work, the material mixture scheme was obtained by direct analysis.