煤岩体相似材料声波速度敏感性正交试验研究

Orthogonal experimental research on sensitivity of acoustic wave velocity of similar material of coal-rock

针对现有研究大多针对煤岩体相似材料的力学性质,而少有对其声波速度变化规律进行分析的问题,选用煤泥、砂子、水泥和水为原料制备煤岩体相似材料,采用极差分析方法就不同配比对相似材料声波速度的影响进行了正交试验研究。结果表明:相似材料的声波速度与煤岩体相近,可在较大范围进行调整,符合煤岩体声波速度指标对相似材料的要求;水泥含量对相似材料的声波速度有明显的影响,煤泥含量对声波速度的影响次之,砂子含量对声波速度的影响不显著,且声波速度与水泥含量和煤泥含量呈正相关关系;相似材料的纵波速度和横波速度之间存在较好的线性正相关性。通过对试验数据进行多元线性回归分析,得到了确定相似材料配比的经验方程,便于制备满足声波速度要求的煤岩体相似材料。

In view of problem that current researches mostly focused on mechanical properties of similar material of coal-rock, but not change law of acoustic wave velocity, similar material of coal-rock was made by use of raw materials of coal slime, sand, cement and water, and influence of different ratio of the similar materials on acoustic wave velocity was investigated by adopting range analysis method and orthogonal experiment. The experimental results show that acoustic wave velocity of the similar material is similar to coal-rock and can be adjusted in a large range, which meets requirements of acoustic wave velocity of coal-rock to similar material; acoustic wave velocity of the similar material is obviously influenced by cement content, next by coal slime content and little by sand content, and acoustic wave velocity is postively related to cement content and coal slime content; there is a good linear positive correlation between primary wave velocity and shear wave velocity of the similar material. Empirical equations for calculating ratio of the similar material were obtained by multiple linear regression of the experiment data, which were for making similar material of coal-rock meeting requirement of acoustic wave velocity.