废弃口罩改性充填材料力学性能与本构关系研究

李向东; 管伟明; 张雪卫; 夏晓成; 胡红倩; 郑瑜

doi:10.13568/j.cnki.651094.651316.2023.12.16.0001

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废弃口罩改性充填材料力学性能与本构关系研究

更新时间：2026-01-21

- 废弃口罩改性充填材料力学性能与本构关系研究
- Journal of Xinjiang University (Natural Science Edition in Chinese and English) Vol. 41, Issue 6, Pages: 746-755(2024)
- 作者机构：
  
  新疆大学地质与矿业工程学院
- 作者简介：
- 基金信息：
- DOI：10.13568/j.cnki.651094.651316.2023.12.16.0001
  CLC： TD803;X705
- Published：2024
- 稿件说明：
移动端阅览
[1]李向东,管伟明,张雪卫,等.废弃口罩改性充填材料力学性能与本构关系研究[J].新疆大学学报(自然科学版中英文),2024,41(06):746-755.
[1]李向东,管伟明,张雪卫,等.废弃口罩改性充填材料力学性能与本构关系研究[J].新疆大学学报(自然科学版中英文),2024,41(06):746-755. DOI： 10.13568/j.cnki.651094.651316.2023.12.16.0001.

DOI：10.13568/j.cnki.651094.651316.2023.12.16.0001.

摘要

针对废弃口罩的处理难题，提出了利用废弃口罩改性矿用充填材料力学性能再利用的解决方案．为研究废弃口罩对于充填材料力学性能的影响，通过胶结充填材料流动度、单轴抗压、劈裂抗拉实验，得到口罩截面大小与体积掺量对充填材料力学性能的影响规律；再借助扫描电镜观察微观结构，揭示口罩对充填材料微观影响机理；最后基于等效应变假说，依据单轴压缩应力-应变曲线，建立口罩充填体损伤本构模型．结果表明：两种截面大小的口罩随体积掺量的增加，流动度与抗压强度降低，但口罩的加入增强了充填体的抗拉强度，体积掺量为1.5%、口罩截面大小为0.5 cm×0.5cm时增幅最大．微观结构表明，口罩纤维与充填体结合紧密，但熔喷层与水化产物未接触，在基体中形成空隙，使得抗压强度降低，基体受力后，空隙被压实，口罩在充填体中起到加筋作用与桥接作用，使得充填体的韧性与抗拉强度增强．建立的本构模型与实验值拟合程度高，可为后续研究提供参考．综合考虑口罩对于充填体力学性能的影响，将口罩加入充填体进行处理时，最佳截面大小为0.5 cm×0.5 cm，体积掺量不宜超过1.0%.

Abstract

In view of the difficult problem of disposal of waste masks

a solution was put forward to reuse the mechanical properties of mine filling materials modified by waste masks. In order to study the influence of the abandoned mask on the mechanical properties of the filling materials

the rule of the influence of the cross section size and volume content of the mask on the mechanical properties of the filling material was obtained through the cemented filling material flow

uniaxial compression and splitting tensile tests. Then the microstructure was observed by scanning electron microscopy to reveal the mechanism of microcosmic influence of the mask on the filling material. Finally

based on the equivalent strain hypothesis and the uniaxial compression stress-strain curve

the damage constitutive model of the mask filling body was established. The results showed that the fluidity and compressive strength of the two types of masks decreased with the increase of volume content

but the addition of masks enhanced the tensile strength of the backfill

and the increase was the largest when the volume content was1.5% and the section size of masks was 0.5 cm×0.5 cm. The microstructure shows that the mask fiber is closely combined with the backfill

but the melt-blown layer is not in contact with the hydration product

forming a gap in the matrix

which reduces the compressive strength. When the matrix is stressed

the gap is compacted

and the mask plays a reinforcing and bridging role in the backfill

which increases the toughness and tensile strength of the backfill. The established constitutive model fits well with the experimental values

which can provide reference for the subsequent research. Considering the influence of the mask on the physical performance of the filling

when the mask is added to the filling body for treatment

the optimal section size of the mask in this experiment is 0.5cm×0.5 cm

and the volume content should not exceed 1.0%.

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references

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