Experimental Study on Mechanical Property of Cemented Backfill in Coal Mine.

IF 3.2 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2025-09-22 DOI:10.3390/ma18184423

Haigang Yang, Rui Wang, Qiang Zhang, Wencheng Ma, Yukai Wang

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Abstract

In response to the insufficiency of shear strength and severe segregation of cemented backfilling material in coal mines, a shear strength test, static segregation index test, and homogeneity degree test were carried out, taking slurry concentration (SC) as the main control factor. The effect law of SC on shear strength, the static segregation index, and the homogeneity degree was discussed. The relationship between the static segregation index and homogeneity degree and shear strength was analyzed, and the action mechanism of SC on shear strength was revealed. The research results show that for cemented backfill in coal mines, with a suspending agent content of 0 and a curing age of 28 d, when SC increases from 77% to 80%, shear strength increases by 31.43%, the static segregation index of the backfilling slurry decreases by 40.29%, and the homogeneity degree of the backfill increases by 69.23%. The increase in SC can enhance shear strength, reduce the segregation degree of backfilling slurry, and improve the homogeneity of backfill. The reason for the increase in shear strength lies in the fact that SC reduces the segregation degree of the backfilling slurry. The research in this paper has certain guiding significance for the timely support of the surrounding rock in the working face and the effective control of surface settlement.

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煤矿胶结充填体力学性能试验研究。

针对煤矿胶结充填体抗剪强度不足、偏析严重的特点，以料浆浓度（SC）为主要控制因素，进行了胶结充填体抗剪强度试验、静态偏析指标试验和均匀度试验。讨论了SC对混凝土抗剪强度、静力偏析指标和均匀度的影响规律。分析了静力偏析指标、均匀度与抗剪强度的关系，揭示了SC对抗剪强度的作用机理。研究结果表明，对于悬浮剂含量为0、养护龄期为28 d的煤矿胶结充填体，当SC从77%增加到80%时，抗剪强度提高31.43%，充填体浆体静态偏析指数降低40.29%，充填体均匀度提高69.23%。SC的增加可以提高抗剪强度，降低充填体的离析程度，改善充填体的均匀性。抗剪强度增加的原因在于SC降低了充填体的离析程度。本文的研究对工作面围岩的及时支护和地表沉降的有效控制具有一定的指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.