动载荷作用下裂隙岩体的止裂机理分析

周磊 姜亚成 朱哲明 董玉清 牛草原 王蒙

周磊, 姜亚成, 朱哲明, 董玉清, 牛草原, 王蒙. 动载荷作用下裂隙岩体的止裂机理分析[J]. 爆炸与冲击, 2021, 41(5): 053102. doi: 10.11883/bzycj-2020-0125
引用本文: 周磊, 姜亚成, 朱哲明, 董玉清, 牛草原, 王蒙. 动载荷作用下裂隙岩体的止裂机理分析[J]. 爆炸与冲击, 2021, 41(5): 053102. doi: 10.11883/bzycj-2020-0125
ZHOU Lei, JIANG Yacheng, ZHU Zheming, DONG Yuqing, NIU Caoyuan, WANG Meng. Mechanism study of preventing crack propagation of fractured rockunder dynamic loads[J]. Explosion And Shock Waves, 2021, 41(5): 053102. doi: 10.11883/bzycj-2020-0125
Citation: ZHOU Lei, JIANG Yacheng, ZHU Zheming, DONG Yuqing, NIU Caoyuan, WANG Meng. Mechanism study of preventing crack propagation of fractured rockunder dynamic loads[J]. Explosion And Shock Waves, 2021, 41(5): 053102. doi: 10.11883/bzycj-2020-0125

动载荷作用下裂隙岩体的止裂机理分析

doi: 10.11883/bzycj-2020-0125
基金项目: 国家自然科学基金(U19A2098);四川省科技计划项目(2021YJ0511);深地科学与工程教育部重点实验室(四川大学)开放基金(DESE202005);工程材料与结构冲击振动四川省重点实验室开放基金(18yfjk02)
详细信息
    作者简介:

    周 磊(1990- ),男,博士,助理研究员,zhouleittkx@126.com

    通讯作者:

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

  • 中图分类号: O346.1

Mechanism study of preventing crack propagation of fractured rockunder dynamic loads

  • 摘要: 为深层次了解裂隙岩体在动载荷作用下的动态断裂特性及止裂机理,采用TWSRC(tunnel with single radial crack)构型进行中低速冲击实验,选择砂岩作为原材料制作裂隙岩体试样,以落锤冲击试验装置与裂纹扩展计实验系统对裂纹的动态起裂、扩展及止裂过程进行全过程监测,重点研究动态破裂过程的破裂行为及止裂现象。使用有限差分法程序进行数值模拟,验证冲击实验结果的科学性与准确性。研究发现:裂隙岩体的动态断裂过程是由起裂加速-高速扩展-缓慢减速-止裂-再次起裂加速-再次高速扩展等多次循环的过程构成,且止裂区间尺寸为微秒量级;裂隙岩体止裂位置的穿晶断裂比例远小于初始起裂点,青砂岩动态断裂过程的穿晶断裂比例稍大于黑砂岩;裂隙岩体中止裂点再次起裂所需的能量,远小于预制裂纹初始起裂所需要的能量。
  • 图  1  TWSRC构型

    Figure  1.  TWSRC sample

    图  2  砂岩材料的XRD成分分析

    Figure  2.  XRD analyses of sandstone materials

    图  3  落锤冲击试验装置

    Figure  3.  Drop hammer impact device

    图  4  冲击脉冲信号

    Figure  4.  Impulse signals

    图  5  实验结果

    Figure  5.  Experimental results

    图  6  青砂岩的快速扩展

    Figure  6.  Rapidly propagation of green sandstone

    图  7  电镜扫描图像

    Figure  7.  Scanning electron micrograph

    图  8  数值模型网格

    Figure  8.  Mesh of numerical model

    图  9  最大主应力

    Figure  9.  Maximum principal stresses

    图  10  数值模拟结果

    Figure  10.  Numerical simulation results

    图  11  止裂点和再次起裂点的应力变化

    Figure  11.  Stress variations at crack arrest point and crack again point

    图  12  起裂点、止裂点和再次起裂点的能量变化

    Figure  12.  Energy variations at crack point, crack arrest point and crack again point

    表  1  砂岩的力学性能

    Table  1.   Mechanical properties of sandstone materials

    材料ρ/(kg·m−3E/GPaμfd/MPacl/(m·s−1ct /(m·s−1
    青砂岩2 26513.580.16524.842 5631 607
    黑砂岩2 65033.670.20552.963 6782 239
    下载: 导出CSV

    表  2  实验结果

    Table  2.   Experimental results

    试件vs/(m·s−1ti/μsta/μsva/(m·s−1la/mm
    青砂岩18.43342.497.6368.615.4
    青砂岩28.40356.179.6363.724.2
    青砂岩38.38367.457.2302.715.4
    黑砂岩18.47370.854.2310.119.8
    黑砂岩28.41350.081.7372.915.4
    黑砂岩38.39387.085.9396.1 8.8
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-04-30
  • 修回日期:  2020-07-24
  • 网络出版日期:  2021-03-05
  • 刊出日期:  2021-05-05

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