Experimental Study on Compressive Strength of Coal Gangue Cemented Backfill Based on Response Surface Method

ZHANG Weigang; QIU Yueqin; GUO Yanqing; LIU Ping

doi:10.13779/j.cnki.issn1001-0076.2022.06.005

2022 Vol. 42, No. 6

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Article navigation > Conservation and Utilization of Mineral Resources > 2022 > 42(6): 36-44

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ZHANG Weigang, QIU Yueqin, GUO Yanqing, LIU Ping. Experimental Study on Compressive Strength of Coal Gangue Cemented Backfill Based on Response Surface Method[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 36-44. doi: 10.13779/j.cnki.issn1001-0076.2022.06.005

Citation:

ZHANG Weigang, QIU Yueqin, GUO Yanqing, LIU Ping. Experimental Study on Compressive Strength of Coal Gangue Cemented Backfill Based on Response Surface Method[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 36-44. doi: 10.13779/j.cnki.issn1001-0076.2022.06.005

Experimental Study on Compressive Strength of Coal Gangue Cemented Backfill Based on Response Surface Method

1.
College of Mining, Guizhou University, Guiyang 550025, China
2.
Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang 550025, Guizhou, China
3.
National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, Guizhou, China

More Information

Corresponding author: QIU Yueqin, 631958848@qq.com

Received Date: 21 July 2022

Publish Date: 26 December 2022

Abstract

Abstract

Ground subsidence caused by coal mining could be sufficiently controlled using cemented coal gangue backfilling materials. In order to study the influence of fine gangue rate, cement content and mass concentration of slurry on the compressive strength of backfilling materials and optimize mixture ratio of backfilling materials. Response surface method was used to design an experiment with 3 factors and 17 proportions based on the single factor experiment, furthermore, the response surface regression model was constructed, and the optimal ratio was calculated, which could provide a scientific method for obtaining a reasonable proportion of filling materials in industry. The results showed that the influence of single factor on the compressive strength of backfilling materials was in order of mass concentration of slurry, cement content and fine gangue rate. The influence of interactions between fine gangue rate and mass concentration of slurry on compressive strength of backfilling materials in the early stage was slight, while the influence of interactions between cement content and mass concentration of slurry on compressive strength of backfilling materials in the middle and later stages was the greatest. The optimal ratio of backfilling slurry was determined by the results of model optimization as m (coal gangue)∶m (fly ash)∶m (cement)∶m (water) = 50%∶22%∶8%∶20%, and the fine gangue rate was 52%, The compressive strength of backfilling materials curing for 28 days was 5.07 MPa, and the error range of the verification test was about 2%, the model was accurate and reliable. The Ca(OH)₂ generated by cement hydration motivates the active substances of fly ash and coal gangue and generates ettringite (AFt) and calcium silicate hydrate (C-S-H) gels. The continuous growth of curing age plays a good role in connecting the cementing system, making the network structure more stable and effectively improving the compressive strength of backfill.
- cemented filling /
- response surface method /
- compressive strength /
- gangue /
- fly ash /
- cement /
- hydration mechanism

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References

[1]	金会心, 吴复忠, 朱明燕, 等. 贵州六盘水煤矸石的矿物特性[J]. 过程工程学报, 2014, 14(1): 151−156. Google Scholar JIN H X, WU F Z, ZHU M Y, et al. Mineral properties of coal gangue in Liupanshui, Guizhou[J]. Journal of process engineering, 2014, 14(1): 151−156. Google Scholar
[2]	BELL F G, STACEY T R, GENSKE D D. Mining subsidence and its effect on the environment: some differing examples[J]. Environmental Geology, 2000, 40(1): 135−152. Google Scholar
[3]	张博, 彭苏萍, 王佟, 等. 构建煤炭资源强国的战略路径与对策研究[J]. 中国工程科学, 2019, 21(1): 88−96. doi: 10.15302/J-SSCAE-2019.01.013 CrossRef Google Scholar ZHANG B, PENG S P, WANG T, et al. Research on the strategic path and Countermeasures of building a coal resource power[J]. China Engineering Science, 2019, 21(1): 88−96. doi: 10.15302/J-SSCAE-2019.01.013 CrossRef Google Scholar
[4]	吴爱祥, 杨莹, 程海勇, 等. 中国膏体技术发展现状与趋势[J]. 工程科学学报, 2018, 40(5): 517−525. Google Scholar WU A X, YANG Y, CHENG H Y, et al. Development status and trend of paste technology in China[J]. Journal of Engineering Science, 2018, 40(5): 517−525. Google Scholar
[5]	XU J, XUAN D, HE C. Innovative backfilling longwall panel layout for better subsidence control effect—separating adjacent subcritical panels with pillars[J]. International Journal of Coal Science & Technology, 2014, 1(3): 297−305. Google Scholar
[6]	顾晓薇, 张延年, 张伟峰, 等. 大宗工业固废高值建材化利用研究现状与展望[J]. 金属矿山, 2022(1): 2−13. Google Scholar GU X W, ZHANG Y N, ZHANG W F, et al. Research status and prospects of high-value building materials utilization of bulk industrial solid wastes[J]. metal mines, 2022(1): 2−13. Google Scholar
[7]	YIN W, ZHANG K, OU Y S, et al. Study on properties of soda residue gangue backfilling materials and field measurement of surface subsidence[J]. Frontiers in Earth Science, 2021: 9. Google Scholar
[8]	段圆圆. 煤基固废协同利用制备采空区充填膏体试验研究[D]. 包头: 内蒙古科技大学, 2021. Google Scholar DUAN Y Y. Experimental study on Preparation of Gob Filling Paste by collaborative utilization of coal-based solid waste [D]. Baotou: Inner Mongolia University of science and technology, 2021. Google Scholar
[9]	SUN Q, ZHANG J, ZHOU N. Early-Age Strength of Aeolian Sand-Based Cemented Backfilling Materials: Experimental Results[J]. Arabian Journal for Science & Engineering, 2017. Google Scholar
[10]	郭晓彦. 充填膏体性能影响因素试验研究[D]. 太原: 太原理工大学, 2013. Google Scholar GUO X Y. Experimental study on factors affecting the performance of filling paste [D]. Taiyuan: Taiyuan University of technology, 2013. Google Scholar
[11]	高谦, 杨晓炳, 温震江, 等. 基于RSM-BBD的混合骨料充填料浆配比优化[J]. 湖南大学学报(自然科学版), 2019, 46(6): 47−55. doi: 10.16339/j.cnki.hdxbzkb.2019.06.007 CrossRef Google Scholar GAO Q, YANG X B, WEN Z J, et al. Optimization of mixture ratio of mixed aggregate filling slurry based on RSM-BBD[J]. Journal of Hunan University (Natural Science Edition), 2019, 46(6): 47−55. doi: 10.16339/j.cnki.hdxbzkb.2019.06.007 CrossRef Google Scholar
[12]	马致远, 刘勇, 周吉奎, 等. 响应曲面法优化废催化剂中微波浸出钒的工艺[J]. 中国有色金属学报, 2019, 29(6): 1308−1315. doi: 10.19476/j.ysxb.1004.0609.2019.06.20 CrossRef Google Scholar MA Z Y, LIU Y, ZHOU J K, et al. Optimization of microwave leaching process of vanadium from spent catalyst by response surface methodology[J]. Chinese Journal of nonferrous metals, 2019, 29(6): 1308−1315. doi: 10.19476/j.ysxb.1004.0609.2019.06.20 CrossRef Google Scholar
[13]	于跃. 煤矿新型胶结充填材料研发及其性能研究[D]. 北京: 中国矿业大学, 2017. Google Scholar YU Y. Research and development of new cemented filling materials for coal mines and their properties [D]. Beijing: China University of mining and Technology, 2017 Google Scholar
[14]	刘树龙, 李公成, 刘国磊, 等. 基于响应面法的矿渣基全固废胶凝材料配比优化[J]. 硅酸盐通报, 2021, 40(1): 187−193. doi: 10.16552/j.cnki.issn1001-1625.2021.01.017 CrossRef Google Scholar LIU S L, LI G C, LIU G L, et al. Optimization of the proportion of slag based solid waste cementitious materials based on response surface methodology[J]. Silicate bulletin, 2021, 40(1): 187−193. doi: 10.16552/j.cnki.issn1001-1625.2021.01.017 CrossRef Google Scholar
[15]	温震江, 杨晓炳, 李立涛, 等. 基于RSM-BBD的全尾砂浆絮凝沉降参数选择及优化[J]. 中国有色金属学报, 2020, 30(6): 1437−1445. doi: 10.11817/j.ysxb.1004.0609.2020-36421 CrossRef Google Scholar WEN Z J, YANG X B, LI L T, et al. Selection and optimization of flocculation settlement parameters of full tail mortar based on rsm-bbd[J]. Chinese Journal of nonferrous metals, 2020, 30(6): 1437−1445. doi: 10.11817/j.ysxb.1004.0609.2020-36421 CrossRef Google Scholar