为了研究粉煤灰-水泥-硅酸钠型胶结充填材料的强度特性,运用正交试验设计了以粉煤灰、水泥、硅酸钠为组合的胶结充填材料,采用极差分析、方差分析及多元回归分析等方法,研究了粉煤灰与水泥质量比值(因素A)、硅酸钠质量浓度(因素B)、料浆质量浓度(因素C)这3种因素对粉煤灰-水泥-硅酸钠胶结充填材料强度特性的相关性影响。结果表明:通过对粉煤灰-水泥-硅酸钠胶结充填材料试块的抗压强度和抗剪强度进行极差分析发现,各因素对于试件的抗压强度与抗剪强度的R值关系均为C>A>B,说明料浆质量浓度对粉煤灰-水泥-硅酸钠胶结充填材料的强度特性影响最大,其次是粉煤灰与水泥质量比值,最后是硅酸钠质量浓度的影响最小;通过对试块抗压强度和抗剪强度进行方差分析发现,对于粉煤灰-水泥-硅酸钠胶结充填材料的抗压强度和抗剪强度,A和C的影响程度极为显著,B对强度没有表现出显著性影响,上述结果与极差分析相对应。建立了各因素共同影响下粉煤灰-水泥-硅酸钠型充填材料强度特性参数的综合预测模型,并对其进行了验证。

In order to study the strength characteristics of fly ash-cement-sodium silicate cemented filling materials, an orthogonal test was conducted to design a cemented filling material with the combination of fly ash, cement and sodium silicate, and the correlation effects of three factors, namely, factor A: the ratio of the mass of fly ash to the mass of cement, factor B: the concentration of the mass of sodium silicate, and factor C: the concentration of the mass of slurry, on the strength characteristics of the fly ash-cement-sodium silicate cemented filling material, were investigated by means of analysis of extreme deviation (AoE), analysis of variance (ANOVA), and multiple regression analysis (MRA). Sodium silicate cemented filling material strength characteristics. The test results show that, through the extreme difference analysis of the compressive strength and shear strength of the specimens of fly ash-cement-sodium silicate cemented filling materials, the R-value relationship of each factor on the compressive strength and shear strength of the specimens is C>A>B, which indicates that the slurry mass concentration has the greatest influence on the strength characteristics of the fly ash-cement-sodium silicate cemented filling materials, followed by the ratio of the mass of the fly ash to the cement and the last factor C: sodium silicate mass concentration has the smallest influence. Sodium silicate mass concentration has the least influence; through the ANOVA on the compressive strength and shear strength of the specimens, it was found that for the compressive strength and shear strength of the fly ash-cement-sodium silicate cemented filling materials, the degree of influence of A and C was extremely significant, and B did not have any significant effect on the strength, and the above results corresponded with the analysis of the extreme variance. A comprehensive model of the strength property parameters of fly ash-cement-sodium silicate-based filling materials under the combined influence of various factors was obtained and validated.