Page 90 - 《爆炸与冲击》2025年第9期
P. 90
第 45 卷 第 9 期 爆 炸 与 冲 击 Vol. 45, No. 9
2025 年 9 月 EXPLOSION AND SHOCK WAVES Sept., 2025
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 *
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崔 鹏 ,罗 刚 ,刘 乐 ,曹芯芯 ,李邦翔 ,梅雪峰 5
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(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)
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 种不同粒组砂样(2.5~5.0 mm、1.25~2.50 mm、0.60~1.25 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、塑性和卸荷等 4 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,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(矿物组成、粒径及分化程度等)的不同而变化;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,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。
关键词: 硅质砂;分离式霍普金森杆;分形破碎特征;吸能效应
中图分类号: O383; TU318 国标学科代码: 13035 文献标志码: A
Experimental study on crushing characteristics and energy absorption effect
of silica sand under dynamic loading
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CUI Peng , LUO Gang , LIU Le , CAO Xinxin , LI Bangxiang , MEI Xuefeng 5
(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 261206, Shandong, China;
5. College of Civil Engineering, Inner Mongolia University of Science and Technology,
Baotou 014010, Inner Mongolia, China)
Abstract: This study investigates the 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, 1.25–2.50 mm, 0.60–1.25 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 four stages: elastic, yielding, plastic and unloading. 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
* 收稿日期: 2024-08-26;修回日期: 2024-11-12
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)
第一作者: 崔 鹏(1998- ),男,硕士研究生,22507020014@stumail.sdut.edu.cn
通信作者: 梅雪峰(1987- ),男,博士,讲师,xfmei@my.swjtu.edu.cn
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