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应力波作用下红砂岩复合动态断裂特征研究

解北京 李晓旭 栾铮 陈思羽 陈铭进 梁天宇

解北京, 李晓旭, 栾铮, 陈思羽, 陈铭进, 梁天宇. 应力波作用下红砂岩复合动态断裂特征研究[J]. 矿业科学学报, 2024, 9(1): 42-52. doi: 10.19606/j.cnki.jmst.2024.01.005
引用本文: 解北京, 李晓旭, 栾铮, 陈思羽, 陈铭进, 梁天宇. 应力波作用下红砂岩复合动态断裂特征研究[J]. 矿业科学学报, 2024, 9(1): 42-52. doi: 10.19606/j.cnki.jmst.2024.01.005
XIE Beijing, LI Xiaoxu, LUAN Zheng, CHEN Siyu, CHEN Mingjin, LIANG Tianyu. Study on the dynamic fracture characteristics of red sandstone composite under stress waves[J]. Journal of Mining Science and Technology, 2024, 9(1): 42-52. doi: 10.19606/j.cnki.jmst.2024.01.005
Citation: XIE Beijing, LI Xiaoxu, LUAN Zheng, CHEN Siyu, CHEN Mingjin, LIANG Tianyu. Study on the dynamic fracture characteristics of red sandstone composite under stress waves[J]. Journal of Mining Science and Technology, 2024, 9(1): 42-52. doi: 10.19606/j.cnki.jmst.2024.01.005

应力波作用下红砂岩复合动态断裂特征研究

doi: 10.19606/j.cnki.jmst.2024.01.005
基金项目: 

国家重点研发计划 2022YFC2904100

中央高校基本科研业务费专项资金 2023ZKPYAQ04

安徽省爆破器材与技术工程实验室 AHBP2022A-03

详细信息
    作者简介:

    解北京(1984—),男,安徽滁州人,博士,副教授,主要从事矿井瓦斯灾害防治、煤岩动力灾害防治等方面的研究工作。Tel:15201290493,E-mail:bjxie1984@cumtb.edu.cn

  • 中图分类号: TD315

Study on the dynamic fracture characteristics of red sandstone composite under stress waves

  • 摘要: 为探究应力波作用下红砂岩的复合动态断裂特性,采用分离式霍普金森压杆和数字图像技术对带预制裂缝的半圆盘三点弯曲试样开展冲击加载实验,分析加载率、波长对红砂岩动态拉伸、断裂特征的影响。结果表明:①红砂岩试样加载率与动态抗拉强度、断裂韧度及破坏率均呈一次函数关系;断裂能随加载率增大而增长415.27 %。②随着波长增加,动态抗拉强度增长742.14 %,其中断裂能增长54.49 %,但能量吸收率呈下降趋势;裂纹扩展平均速度增长4.09 %,且首尾裂纹应变增长时间出现滞后现象;破坏率增长效应得到强化。③冲击速度8 m/s时试件主裂纹首尾监测点位的应变平均增加84.31 %。
  • 图  1  SCB试样

    Figure  1.  Semi-circular bending specimens

    图  2  SHPB实验系统

    Figure  2.  SHPB experimental device

    图  3  应力平衡验证

    Figure  3.  Verification of stress balance

    图  4  不同长度子弹在相同冲击速度下的波形

    Figure  4.  Waveforms of different bullets

    图  5  拉伸应力时程曲线

    Figure  5.  Tensile stress time-history curve

    图  6  加载率效应曲线

    Figure  6.  Loading rate effect curve

    图  7  动态断裂韧度-加载率关系

    Figure  7.  Dynamic fracture toughness loading rate relationship

    图  8  不同波长冲击下SCB试件时间-转动角度

    Figure  8.  Time-rotation angle of SCB specimens under different wavelength

    图  9  不同加载率下SCB试件时间-转动角度

    Figure  9.  Time-rotation angle of SCB specimens under impacts of different loading rate

    图  10  波长-能量关系

    Figure  10.  Wavelength-energy relationship

    图  11  加载率-能量关系

    Figure  11.  Loading rate-energy relationship

    图  12  试样破坏前后照片

    Figure  12.  Photos before and after sample damage

    图  13  不同冲击速度下垂直方向应变云图

    Figure  13.  Vertical strain nephogram under different velocities

    图  14  不同冲击速度下监测点应变时程曲线

    Figure  14.  Time course of strain at monitoring points under impacts of different velocities

    图  15  裂纹扩展应变片的粘贴

    Figure  15.  Adhesion of crack extension strain gauges

    图  16  裂纹扩展应变片电压时程曲线

    Figure  16.  Voltage time history curve

    图  17  不同波长下裂纹扩展速度-距离曲线

    Figure  17.  Crack propagation velocity-distance curves at different wavelengths

    图  18  波长-冲击速度破坏形态

    Figure  18.  Wavelength-impact velocity damage pattern

    图  19  试样破坏形态素描图

    Figure  19.  Sketch of the damage pattern of the specimen

    图  20  破坏率与冲击速度关系

    Figure  20.  Relationship between damage rate impact velocity

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  • 收稿日期:  2023-07-03
  • 修回日期:  2023-11-01
  • 刊出日期:  2024-02-29

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