爆炸荷载作用下两平行裂纹对扩展中裂纹的影响规律

万端莹 朱哲明 刘瑞峰 刘邦

万端莹, 朱哲明, 刘瑞峰, 刘邦. 爆炸荷载作用下两平行裂纹对扩展中裂纹的影响规律[J]. 爆炸与冲击, 2019, 39(8): 083105. doi: 10.11883/bzycj-2019-0008
引用本文: 万端莹, 朱哲明, 刘瑞峰, 刘邦. 爆炸荷载作用下两平行裂纹对扩展中裂纹的影响规律[J]. 爆炸与冲击, 2019, 39(8): 083105. doi: 10.11883/bzycj-2019-0008
WAN Duanying, ZHU Zheming, LIU Ruifeng, LIU Bang. Effect of two parallel cracks on main propagating cracks under blasting[J]. Explosion And Shock Waves, 2019, 39(8): 083105. doi: 10.11883/bzycj-2019-0008
Citation: WAN Duanying, ZHU Zheming, LIU Ruifeng, LIU Bang. Effect of two parallel cracks on main propagating cracks under blasting[J]. Explosion And Shock Waves, 2019, 39(8): 083105. doi: 10.11883/bzycj-2019-0008

爆炸荷载作用下两平行裂纹对扩展中裂纹的影响规律

doi: 10.11883/bzycj-2019-0008
基金项目: 国家自然科学基金(11672194,11702181);四川省科技计划(2018JZ0036);四川省安全监管局安全生产科技项目(aj20170515161307)
详细信息
    作者简介:

    万端莹(1996- ),男,硕士研究生,2451268602@qq.com

    通讯作者:

    朱哲明(1965- ),男,博士,教授,zhemingzhu@hotmail.com

  • 中图分类号: O346.5

Effect of two parallel cracks on main propagating cracks under blasting

  • 摘要: 用实验和数值模拟方法,研究在爆炸载荷下岩体内部一对平行裂纹对扩展主裂纹的影响规律。实验中,采用带有中心装药孔及预制裂纹的砂岩圆盘试件,利用由示波器、超动态应变仪及裂纹扩展计所组成的测试系统,监测主裂纹扩展速度和扩展距离;数值模拟中,采用了AUTODYN软件进行,模拟了主裂纹及两平行裂纹的扩展规律,对岩石材料,采用线性状态方程及最大拉应力失效准则,并在两平行裂纹间设置相应的观测点记录应力曲线。通过实验与数值模拟分析,得到:爆炸载荷下,紧随冲击波后的稀疏波经过两平行裂纹面反射后变成压缩波,并在两平行裂纹间产生垂直于主裂纹扩展方向的压应力,对裂纹的扩展有压制、止裂作用;而且,这种压应力的大小与两平行裂纹的间距有关,进而导致了不同的止裂效果,影响裂纹的扩展速度及最终扩展长度。
  • 图  1  实验砂岩模型和试件尺寸

    Figure  1.  Sandstone specimen and its dimension

    图  2  岩石波速测试示意图

    Figure  2.  Illustration of wave velocity measurement of sandstone

    图  3  雷管放置示意图

    Figure  3.  Illustration of detonator’s location

    图  4  测试系统示意图

    Figure  4.  Illustration of test system

    图  5  不同间距时主裂纹扩展情况

    Figure  5.  Propagation patterns of main cracks with different spacings

    图  6  试件中CPG记录的电压信号及其导数

    Figure  6.  CPG recorded voltage signal and its derivative

    图  7  由CPG测试的主裂纹扩展速度

    Figure  7.  CPG measured velocity of main crack propagation

    图  8  数值模型示意图

    Figure  8.  Simulation model

    图  9  平行裂纹不同间距时主裂纹扩展的数值模拟结果

    Figure  9.  Simulation results for specimens with different distances between parallel cracks

    图  10  全过程压力分布的数值模拟结果

    Figure  10.  Pressure distribution in numerical simulation

    图  11  质点速度矢量和σy分布(正为拉应力,负为压应力)

    Figure  11.  Distribution of particle velocity vector and σy (positive: tensile stress, negative: compressive stress)

    图  12  观测点应力曲线和不同间距下y方向最大压应力

    Figure  12.  Stress curves of target points and maximum compressive stress in y direction of different spacing

    图  13  P波传播示意图

    Figure  13.  Illustration of P-wave propagation

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出版历程
  • 收稿日期:  2019-01-11
  • 修回日期:  2019-02-25
  • 网络出版日期:  2019-07-25
  • 刊出日期:  2019-08-01

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