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

Volume 30 Issue 8

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(8): 1584-1595

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://doi.org/10.1007/s12613-022-2574-5

Cite this article as:

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://doi.org/10.1007/s12613-022-2574-5

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研究论文

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

1)
中国矿业大学(北京)力学与建筑工程学院, 北京 100083, 中国
2)
北京科技大学土木与资源工程学院, 北京 100083, 中国
3)
中国矿业大学(北京)能源与矿业学院, 北京 100083, 中国

通讯作者:
王树帅 E-mail: wsstree@163.com

李永亮 E-mail: lyl_cumtb@163.com

文章亮点

(1) 采用响应面法RSM–BBD对风积沙胶结充填体（CASB）力学和微观性能进行了分析。

(2) 单因素（水泥含量、灰沙比和质量分数）和交互作用项增强了CASB龄期强度（UCS）。

(3) 采用TG/DTG、MIP、SEM等方法分析了CASB的微观结构。

(4) 获得了UCS与热重损失量、孔隙含量的拟合关系。

中文摘要

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。

关键词:

Research Article

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

+ Author Affiliations

1)
School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2)
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
3)
School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Renshu Yang is an editorial board member for this journal and was not involved in the editorial review or the decision to publish this article. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Corresponding authors:
Shushuai Wang E-mail: wsstree@163.com

Yongliang Li E-mail: lyl_cumtb@163.com
Received: 31 July 2022; Revised: 21 November 2022; Accepted: 23 November 2022; Available online: 24 November 2022

Abstract

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.
- cemented aeolian sand backfill;
- response surface method;
- mechanical properties;
- microscopic properties;
- influence mechanism

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