动荷载下硅砂的破碎特性及吸能效应试验研究

崔鹏; 罗刚; 刘乐; 曹芯芯; 李邦翔; 梅雪峰

doi:10.11883/bzycj-2024-0309

动荷载下硅砂的破碎特性及吸能效应试验研究

doi: 10.11883/bzycj-2024-0309

崔鹏^1,,
罗刚²,
刘乐³,
曹芯芯⁴,
李邦翔¹,
梅雪峰^5, ,

1.
山东理工大学建筑工程与空间信息学院，山东淄博 255049
2.
西南交通大学地球科学与环境工程学院，四川成都 611756
3.
重庆交通大学土木工程学院，重庆 400074
4.
山东交通职业学院公路与建筑系，山东潍坊 261206
5.
内蒙古科技大学土木工程学院，内蒙古包头 014010

基金项目: 国家自然科学基金（52309137，42277143）；国家重点研发计划（2022YFC3005704）；四川省自然资源厅科技项目（KJ-2023-004）；山东省自然科学基金（ZR2021QE209）

详细信息

作者简介:
崔　鹏（1998－　），男，硕士研究生，22507020014@stumail.sdut.edu.cn

通讯作者:
梅雪峰（1987－　），男，博士，讲师，xfmei@my.swjtu.edu.cn

中图分类号: O383; TU318
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- 文章访问数: 165
- HTML全文浏览量: 8
- PDF下载量: 69
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-26
- 修回日期: 2024-11-12
- 网络出版日期: 2024-11-12

Experimental study on crushing characteristics and energy absorption effect of silica sand under dynamic loading

1.
School of Architectural Engineering, ShanDong University of Technology, Zibo 255049, Shandong, China
2.
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan China
3.
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
4.
Department of Highway and Architecture, Shandong Transport Vocational College, Weifang Shandong, 261206, China
5.
College of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China

摘要

摘要: 为揭示动荷载下硅砂的破碎特性及吸能效应，基于改进的分离式霍普金森杆（split Hopkinson pressure bar, SHPB）研究了4种不同粒径砂样（2.5～5.0 mm、1.25～2.5 mm、0.6～1.25 mm和<0.3 mm）的动力响应特征。结果表明，粒径和应变率会影响砂的动态应力-应变行为。砂的变形可分为弹性、屈服和塑性等3个阶段。试样的压实过程主要由屈服阶段的塑性压实和塑性阶段的破碎压密组成；颗粒相对破碎率与应变率及有效粒径均近似成正比关系，与分形维数成反比；颗粒粒度对吸能效率的影响随颗粒特性的不同而变化（矿物组成、粒径及分化程度等）；相同应力水平下，颗粒粒径越大，能量吸收效率越高；相同加载应变率条件下，颗粒越大，试样的峰值应力越小。为提高砂的吸能效率和减小负荷水平，建议采用较大粒径的硅砂。
- 硅质砂 /
- 分离式霍普金森杆 /
- 分形破碎特征 /
- 吸能效应
Abstract: This study investigates the dynamic response characteristics of silica sand under dynamic loading, employing a modified split Hopkinson pressure bar (SHPB) to gain insights into its crushing behavior and energy absorption properties. Four distinct grain size (2.5–5.0 mm, 1.25–2.5 mm, 0.6–1.25 mm, and <0.3 mm) were analyzed, with results demonstrating that the dynamic stress-strain behavior of silica sand is affected by both grain size and strain rate. The deformation process of silica sand is categorized into three stages: elastic, yielding, and plastic. Plastic compaction is dominant during the yielding stage, whereas crushing compaction prevails in the plastic stage. The relative breakage of particles shows a positive correlation with both strain rate and effective particle size, and an inverse correlation with fractal dimension. The impact of particle size on energy absorption efficiency is influenced by factors such as mineral composition, particle size, and differentiation degree. Under identical stress levels, larger particle sizes demonstrate greater energy absorption efficiency; similarly, under identical loading strain rates, larger particles exhibit lower peak stress. To improve sand's energy absorption efficiency and reduce required loading levels, sand with larger particle sizes is recommended.
- silica sand /
- split Hopkinson pressure bar /
- fractal crushing characteristics /
- energy absorption effect

HTML全文

图 1 改进的霍普金森杆

Figure 1. Improved split Hopkinson pressure bar

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图 2 粒径分布图

Figure 2. Particle size distribution

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图 3 硅砂表面扫描电镜图

Figure 3. Scanning electron microscope photo of silica sand

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图 4 试验步骤

Figure 4. Test steps

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图 5 典型三波图

Figure 5. Typical three-wave pattern

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图 6 应力平衡验证

Figure 6. Stress equilibrium verification

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图 7 重复性验证

Figure 7. Replication experiment

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图 8 应变时程曲线

Figure 8. Strain time history curve

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图 9 应变率时程曲线

Figure 9. Strain rate time history curve

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图 10 不同应变率下应力-应变曲线

Figure 10. Stress-strain curves under different strain rates

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图 11 典型应力-应变曲线

Figure 11. Typical stress-strain curve

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图 12 屈服应力与有效粒径的关系

Figure 12. Relationship between yield stress and effective diameter

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图 13 峰值应力与应变率的关系

Figure 13. Relationship between peak stress and strain rate

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图 14 不同粒径下颗粒变形特性

Figure 14. Deformation characteristics of particles under different particle sizes

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图 15 颗粒相对破碎率的定义

Figure 15. Definition particle of relative breakage

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图 16 砂颗粒破碎模式^[34]

Figure 16. Particle crushing mode of sand^[34]

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图 17 粒径分布演化

Figure 17. Evolution of particle size distribution

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图 18 不同应变率下相对破碎率与有效粒径的关系

Figure 18. Relationship between relative breakage and effective particle size under different strain rates

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图 19 不同粒径下相对破碎率与应变率的关系

Figure 19. Correlation of relative breakage with strain rate across particle size

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图 20 颗粒破碎前后对比

Figure 20. Comparison before and after particle crushing

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图 21 分形维数演化模式

Figure 21. Fractal dimension evolution model

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图 22 不同应变率下有效粒径与分形维数的关系

Figure 22. Relationship between effective particle size and fractal dimension under varying strain rates

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图 23 不同粒径下相对破碎系数与分形维数的关系

Figure 23. Relationship between relative breakage and fractal dimension under different particle sizes

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图 24 分形维数与峰值应力的关系

Figure 24. Relationship between fractal dimension and peak stress

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图 25 应变率与峰值应力的关系

Figure 25. Relationship between strain rate and peak stress

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图 26 不同应变率下粒径与不均匀系数的关系

Figure 26. Relationship between particle size and unevenness coefficient under varying strain rates

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图 27 相对破碎率和入射能的关系

Figure 27. Relationship between incident energy and relative breakage

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图 28 不同应变率下能量吸收效率与应力的关系

Figure 28. Relationship between energy absorption efficiency and stress under varying strain rates

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图 29 不同应变率下能量吸收效率与应变的关系

Figure 29. Relationship between energy absorption efficiency and strain under varying strain rates

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