[1]孙热①,谢全民②,仇志龙③,等.基于SHPB的红砂岩冲击破碎特征的试验研究[J].爆破器材,2024,53(06):18-23.[doi:10.3969/j.issn.1001-8352.2024.06.003]
　SUN Re,XIE Quanmin,QIU Zhilong,et al.Experimental Study on Impact Fragmentation Characteristics of Red Sandstone Based on SHPB[J].EXPLOSIVE MATERIALS,2024,53(06):18-23.[doi:10.3969/j.issn.1001-8352.2024.06.003]
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基于SHPB的红砂岩冲击破碎特征的试验研究()
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《爆破器材》[ISSN:1001-8352/CN:32-1163/TJ]

卷:
53
期数:
2024年06
页码:
18-23
栏目:
基础理论
出版日期:
2024-12-06

文章信息/Info

Title:
Experimental Study on Impact Fragmentation Characteristics of Red Sandstone Based on SHPB
文章编号:
5940
作者:
孙热①; 谢全民②; 仇志龙③; 万鹏③; 马俊①; 彭磊①
①江汉大学数字建造与爆破工程学院（湖北武汉，430056）
②江汉大学精细爆破国家重点试验室（湖北武汉，430056）
③中铁一局集团铁路建设有限公司(陕西咸阳,712099)
Author(s):
SUN Re①;  XIE Quanmin②;  QIU Zhilong③;  WAN Peng③;  MA Jun①;  PENG Lei①
① School of Digital Construction and Blasting Engineering, Jianghan University (Hubei Wuhan, 430056)
② State Key Laboratory of Precision Blasting, Jianghan University (Hubei Wuhan, 430056)
③ China Railway First Group Railway Construction Co., Ltd. (Shaanxi Xianyang, 712099)
关键词:
冲击载荷; 分形维数; 耗散能; 破碎特征
Keywords:
impact load;  fractal dimension;  dissipated energy;  fragmentation characteristic
分类号:
TD235.4
DOI:
10.3969/j.issn.1001-8352.2024.06.003
文献标志码:
A
摘要:
为研究冲击载荷作用时不同应变率条件下红砂岩的破碎分形特征，采用100 mm大直径分离式霍普金森压杆(SHPB)对红砂岩进行冲击压缩试验。得到中、高应变率下红砂岩的应力-应变曲线、能量参数及破碎后岩块的分布情况。同时，基于碎块粒度分布的质量分形模型，分析了红砂岩在冲击载荷作用下的破碎耗能特性，并定量分析了分形维数D与耗能密度η之间的相关性。研究结果表明：红砂岩的动态抗压强度随应变率的增加而提高，具有明显的率相关性;同时,红砂岩的宏观破碎形态随应变率的增加而更加破碎；随着耗能密度η的增加，分形维数D也呈现出相应的增长，并且这种增长趋势与乘幂函数的关系相吻合。
Abstract:
In order to investigate the fractal characteristics of red sandstone fragmentation under different strain rates under impact loading, a 100 mm large-diameter split Hopkinson pressure bar (SHPB) was used to conduct impact compression tests on red sandstone. Stress-strain curves, energy parameters, and distribution of fractured rock blocks of red sandstone under medium and high strain rates were obtained. Based on the mass fractal model of fragment size distribution, the fragmentation energy dissipation characteristics of red sandstone under impact load were analyzed, and the correlation between fractal dimension D?and dissipated energy density η?was quantitatively analyzed. The study results indicate that the dynamic compressive strength of red sandstone increases with the increase of strain rate, demonstrating a clear rate dependency. Meanwhile, the macroscopic fragmentation pattern of red sandstone becomes more crushed with the increase of strain rate. As the dissipated energy density η?increases, the fractal dimension D?also shows a corresponding increase, and this growth trend is consistent with the power function relationship.

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备注/Memo

备注/Memo:
收稿日期：2024-04-17
基金项目：国家自然科学基金项目(52378399)；武汉市知识创新项目(2023020201010147)；湖北（武汉）爆炸与爆破技术研究院2022年博士科研启动基金(PBSKL-2022-QD-03)
第一作者：孙 热(1998—)，男，硕士研究生，主要从事工程爆破领域的研究。E-mail：srblast@163.com
通信作者：谢全民(1983—)，男，博士，副教授，博导，主要从事工程爆破方面的研究。E-mail：xqmblast@jhun.edu.cn
更新日期/Last Update: 2024-12-04