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Dynamic regimes of cemented backfill at early-age

早龄期胶结充填体的动态力学特性

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Abstract

In view of the mechanics characteristic of cemented tailings backfill (CTB) at early age, the separation Hopkinson pressure bar test device was used to explore the effects of curing age and impact energy. A total of 48 CTB samples with diameter of 50 mm and length of 25 mm were prepared with curing ages of 3, 5, 7 and 9 d. Impact tests under different impact energy (10, 20, 30 and 40 J) were carried out. The microstructure of CTB at different ages was analyzed by scanning electron microscopy (SEM). The results show that, the curing age mainly affects the mechanical properties and internal structure of early-age CTB. With increasing curing age, the mechanical properties of early-age CTB change from viscoelasticity to brittleness. The impact energy mainly affects the response of dynamic peak compressive strength to strain rate. Under low strain rate, the structure of CTB is broken, but still has bearing capacity, affecting the formation of later strength. It is concluded that the structural loses completely under the action of high strain rate. Therefore, the control of impact energy and the protection of curing age should be fully considered in actual production process.

摘要

为了明确早龄期胶结充填体的动态力学特性,采用分离式Hopkinson 压杆(SHPB)试验装置探索了养护龄期和冲击能对充填体动态力学性能的影响。将制备好的直径为 50 mm、长度25 mm 的胶结充填体试样在标准养护条件下分别养护3、5、7 和9 d,然后开展不同冲击能量(10、20、30 和40 J)下的胶结充填体动力学试验,并结合扫描电镜(SEM)分析了不同龄期CTB 的微观结构。结果表明,养护龄期主要影响充填体的力学性能和内部结构,随着养护龄期的增加,早龄期充填体的变形特性由粘弹性向脆性转变;冲击能量主要影响充填体动态抗压强度对应变率响应的敏感性;早龄期充填体在低应变率作用下结构发生一定的破坏,影响后期强度,但仍具有一定的承载力,在高应变率作用下充填体结构完全破坏,丧失承载能力。因此,在实际生产过程中应充分考虑冲击能量的控制和养护龄期的保障。

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Funding

Project(CXZZBS2019126) supported by the Innovative Support Program for Doctoral Students in Hebei Province, China; Project(QN2019078) supported by the Science and Technology Research Project of Colleges and University in Hebei Province, China; Project(51774137) supported by the National Natural Science Foundation of China

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Authors and Affiliations

  1. School of Mining Engineering, North China University of Science and Technology, Tangshan, 063210, China

    Zhi-yi Liu  (刘志义) & De-qing Gan  (甘德清)

  2. Development and Safety Key Lab of Hebei Province, Tangshan, 063210, China

    Zhi-yi Liu  (刘志义) & De-qing Gan  (甘德清)

  3. Department of Science and Technology, North China University of Science and Technology, Tangshan, 063210, China

    Ze Gan  (甘泽)

Authors
  1. Zhi-yi Liu  (刘志义)
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  2. De-qing Gan  (甘德清)
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  3. Ze Gan  (甘泽)
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Contributions

LIU Zhi-yi and GAN De-qing provided the concept and edited the draft of manuscript. GAN De-qing revised the experiment program. LIU Zhi-yi and GAN Ze carried out experiments and processed the data. LIU Zhi-yi conducted the literature review and wrote the first draft of the manuscript. GAN Ze edited the draft of manuscript.

Corresponding author

Correspondence to Zhi-yi Liu  (刘志义).

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All the authors state that there is no conflict of interest.

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Liu, Zy., Gan, Dq. & Gan, Z. Dynamic regimes of cemented backfill at early-age. J. Cent. South Univ. 28, 2079–2090 (2021). https://doi.org/10.1007/s11771-021-4754-2

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  • DOI: https://doi.org/10.1007/s11771-021-4754-2

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