单因素及相互作用项对风积沙胶结充填体力学与微观特性分析

王树帅; 杨仁树; 李永亮; 徐斌; 路彬

doi:10.1007/s12613-022-2574-5

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Shushuai Wang, Renshu Yang, Yongliang Li, Bin Xu, and Bin Lu, Single-factor analysis and interaction terms on the mechanical and microscopic properties of cemented aeolian sand backfill, Int. J. Miner. Metall. Mater., 30(2023), No. 8, pp.1584-1595. https://dx.doi.org/10.1007/s12613-022-2574-5

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单因素及相互作用项对风积沙胶结充填体力学与微观特性分析

摘要: 采用风积沙（AS）作为骨料制备煤矿胶结充填材料，可以解决煤矸石不足、风积沙堆积过多的问题。由于对风积沙胶结充填体（CASB）力学机理研究不足，本文采用响应面法（RSM）分析了普通硅酸盐水泥（PO）掺量(x₁)、粉煤灰（FA）与风积沙掺量比值（灰沙比，FA –AS ratio）（x₂）、质量浓度（x₃）对CASB力学和微观特性的影响。通过热重分析、压汞法和扫描电镜对充填体水化特性和内部孔隙结构进行了评价。RSM结果表明，各因素及相互作用项对CASB力学特性的影响极为显著。单轴抗压强度（UCS）随PO掺量、FA–AS比和质量浓度的增加而增加。分析了交互作用项x₁x₂、x₁x₃、x₂x₃对CASB的UCS的影响，影响结果表明，一个因素的增加会促进另一个因素对强度的增强效应。养护时间、PO掺量、FA–AS比对充填体的增强机理表现为水化产物的增加和孔隙结构的优化，而浓度的增强机理主要是孔隙结构的优化。UCS与热重损失量、微孔含量呈正相关，与总孔隙度呈负相关。强度与失重量、微孔含量和总孔隙度拟合函数的R²值均超过0.9，补充了基于热重分析和孔隙结构对UCS增强机理的表征。得出了PO掺量、FA–AS比、浓度以及相互作用项对CASB力学性能的影响规律和机理，为CASB充填提供了一定的理论和工程指导。

Single-factor analysis and interaction terms on the mechanical and microscopic properties of cemented aeolian sand backfill

Abstract: The use of aeolian sand (AS) as an aggregate to prepare coal mine cemented filling materials can resolve the problems of gangue shortage and excessive AS deposits. Owing to the lack of research on the mechanism of cemented AS backfill (CASB), the response surface method (RSM) was adopted in this study to analyze the influence of ordinary Portland cement (PO) content (x₁), fly ash (FA)–AS (FA–AS) ratio (x₂), and concentration (x₃) on the mechanical and microscopic properties of the CASB. The hydration characteristics and internal pore structure of the backfill were assessed through thermogravimetric/derivative thermogravimetric analysis, mercury intrusion porosimetry, and scanning electron microscopy. The RSM results show that the influence of each factor and interaction term on the response values is extremely significant (except x₁x_3, which had no obvious effect on the 28 d strength). The uniaxial compressive strength (UCS) increased with the PO content, FA–AS ratio, and concentration. The interaction effects of x₁x₂, x₁x₃, and x₂x₃ on the UCS at 3, 7, and 28 d were analyzed. In terms of the influence of interaction items, an improvement in one factor promoted the strengthening effect of another factor. The enhancement mechanism of the curing time, PO content, and FA–AS ratio on the backfill was reflected in the increase in hydration products and pore structure optimization. By contrast, the enhancement mechanism of the concentration was mainly the pore structure optimization. The UCS was positively correlated with weight loss and micropore content but negatively correlated with the total porosity. The R² value of the fitting function of the strength and weight loss, micropore content, and total porosity exceeded 0.9, which improved the characterization of the enhancement mechanism of the UCS based on the thermogravimetric analysis and pore structure. This work obtained that the influence rules and mechanisms of the PO, FA–AS, concentration, and interaction terms on the mechanical properties of the CASB provided a certain theoretical and engineering guidance for CASB filling.

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