摘要:
以河砂、碳酸钙、石膏和重晶石为相似材料,应用正交设计方法,以骨料质量与胶结材料质量比、碳酸钙质量与石膏质量比、重晶石粉质量与骨料质量比为控制因素,制定了三因素五水平的试验方案。通过室内力学试验,在获取不同方案的密度、抗压强度、弹性模量等力学指标测试的基础上,分析了力学指标影响因素,得出了相似材料配比与力学指标关系方程。结果表明:重晶石含量对相似材料密度起控制作用;抗压强度力学指标主控因素是骨料质量与胶结材料质量比;相似材料的弹性模量力学指标受骨料质量与胶结材料质量比影响最大,其次为重晶石含量,受碳酸钙质量与石膏质量比影响最小。采用MATLAB 程序进行多元线形回归得出,相似材料配比与力学指标关系方程可用于相似材料模型试验配比的确定。
Abstract:
Taking river sand, calcium carbonate , gypsum, barite as similar materials, an experi-ment scheme called three controlling factors with five variable levels, which consisted of the weight ratio of aggregates to cementing material, calcium carbonate to gypsum and barite powder to aggre-gates, was set up by applying orthogonal design method.Through laboratory mechanics experiment, mechanics indexes of different schemes such as density, compressive strength, and elastic modulus were obtained and analyzed, thus deduced relation equation between similar material proportion and mechanics index.The results show that the barite content has a key effect on density of similar ma-terial.The weight ratio of aggregates to cementing material was the primary controlling factor of compressive strength.The elastic modulus mechanics index was mostly affected by the weight ratio of aggregates to cementing material, then the barite content, and it was least affected by the weight ratio of calcium carbonate to gypsum.The regression relation equation between similar material pro-portion and mechanics index was obtained by using MATLAB, which could be used to determine the ratio of similar material model test.
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