水泥含量、聚丙烯纤维长度和掺量对风积沙胶结充填体流动性和力学特性的影响

王树帅; 杨仁树; 李永亮; 岳中文

doi:10.1007/s12613-024-2885-9

Volume 31 Issue 11

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(11): 2404-2416

Shushuai Wang, Renshu Yang, Yongliang Li, and Zhongwen Yue, Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber-toughened cemented aeolian sand backfill, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2404-2416. https://doi.org/10.1007/s12613-024-2885-9

Cite this article as:

Shushuai Wang, Renshu Yang, Yongliang Li, and Zhongwen Yue, Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber-toughened cemented aeolian sand backfill, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2404-2416. https://doi.org/10.1007/s12613-024-2885-9

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研究论文

水泥含量、聚丙烯纤维长度和掺量对风积沙胶结充填体流动性和力学特性的影响

1)
中国矿业大学(北京)力学与土木工程学院, 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

文章亮点

(1) 分析了水泥含量、聚丙烯纤维掺量与长度对风积沙胶结料浆流动性与流变特性的影响

(2) 获得了聚丙烯纤维增韧不同水泥含量的风积沙胶结充填体的力学特性

(3) 通过DIC和SEM揭示了纤维增韧风积沙胶结充填体的破坏特征和纤维的作用机理

(4) 采用响应面法从“单因素–双因素交互作用项–三因素耦合效应”三个层面揭示了水泥与聚丙烯纤维对风积沙胶结充填体强度的影响规律。

中文摘要

利用风积沙进行采空区充填，可以实现煤矿绿色开采与风积沙治理的协调开展。风积沙胶结充填体（Cemented aeolian sand backfill，CASB）具有脆性破坏特征。聚丙烯（Polypropylene，PP）纤维是优良的增韧材料。在分析纤维增韧作用时，还应考虑纤维对料浆输送性能的影响。此外，水泥会影响水化产物、纤维和基质之间的相互作用。本文研究了水泥含量（8wt%、9wt%和10wt%）、PP纤维长度（6、9和12 mm）和掺量（0.05wt%、0.1wt%、0.15wt%、0.2wt%和0.25wt%）对纤维增韧风积沙胶结充填体（Fiber-toughened CASB， FCASB）流动性和力学特性的影响。结果表明，随着上述三个因素的增加，风积沙胶结料浆扩展度减小，流变参数增大。单轴抗压强度（Uniaxial compressive strength，UCS）随水泥含量和纤维长度的增加而增大，随纤维掺量的增加先增大后减小，在纤维掺量为0.15wt%最大。应变随纤维掺量和长度的增加均增大。随着水泥掺量的增加，PP纤维的作用效果更加显著。数字图像相关（Digital image correlation，DIC）系统监测结果表明，纤维的加入可以抑制充填体块体的剥落和裂缝的扩展，降低充填体的应力集中。微观结构测试表明，纤维的作用机制主要涉及纤维与水化产物和基质的相互作用以及纤维的空间分布。在单因素分析的基础上，采用响应面法分析了上述3个因素及其交互作用项对FCASB强度的影响。建立了双因素相互作用项的影响曲面和三因素耦合效应的影响三维散点图。综上所述，获得了水泥和PP纤维作用下风积沙胶结充填材料性能的响应规律，为纤维增韧风积沙充填提供了理论和工程指导。

关键词:

Research Article

Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber-toughened cemented aeolian sand backfill

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Abstract

Abstract

Using aeolian sand (AS) for goaf backfilling allows coordination of green mining and AS control. Cemented AS backfill (CASB) exhibits brittle fracture. Polypropylene (PP) fibers are good toughening materials. When the toughening effect of fibers is analyzed, their influence on the slurry conveying performance should also be considered. Additionally, cement affects the interactions among the hydration products, fibers, and aggregates. In this study, the effects of cement content (8wt%, 9wt%, and 10wt%) and PP fiber length (6, 9, and 12 mm) and dosage (0.05wt%, 0.1wt%, 0.15wt%, 0.2wt%, and 0.25wt%) on fluidity and mechanical properties of the fiber-toughened CASB (FCASB) were analyzed. The results indicated that with increases in the three aforementioned factors, the slump flow decreased, while the rheological parameters increased. Uniaxial compressive strength (UCS) increased with the increase of cement content and fiber length, and with an increase in fiber dosage, it first increased and then decreased. The strain increased with the increase of fiber dosage and length. The effect of PP fibers became more pronounced with the increase of cement content. Digital image correlation (DIC) test results showed that the addition of fibers can restrain the peeling of blocks and the expansion of fissure, and reduce the stress concentration of the FCASB. Scanning electron microscopy (SEM) test indicated that the functional mechanisms of fibers mainly involved the interactions of fibers with the hydration products and matrix and the spatial distribution of fibers. On the basis of single-factor analysis, the response surface method (RSM) was used to analyze the effects of the three aforementioned factors and their interaction terms on the UCS. The influence surface of the two-factor interaction terms and the three-dimensional scatter plot of the three-factor coupling were established. In conclusion, the response law of the FCASB properties under the effects of cement and PP fibers were obtained, which provides theoretical and engineering guidance for FCASB filling.
- polypropylene fibers;
- fiber-toughened cemented aeolian sand backfill;
- digital image correlation;
- scanning electron microscopy;
- response surface method

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