一维静载与循环冲击共同作用下砂岩动态力学特性试验研究

范利丹 徐峰 余永强 张志伟 余雳伟 周桂杰

范利丹, 徐峰, 余永强, 张志伟, 余雳伟, 周桂杰. 一维静载与循环冲击共同作用下砂岩动态力学特性试验研究[J]. 高压物理学报, 2022, 36(3): 034101. doi: 10.11858/gywlxb.20210879
引用本文: 范利丹, 徐峰, 余永强, 张志伟, 余雳伟, 周桂杰. 一维静载与循环冲击共同作用下砂岩动态力学特性试验研究[J]. 高压物理学报, 2022, 36(3): 034101. doi: 10.11858/gywlxb.20210879
FAN Lidan, XU Feng, YU Yongqiang, ZHANG Zhiwei, YU Liwei, ZHOU Guijie. Experimental Study of Dynamic Mechanical Characteristics of Sandstone under One-Dimensional Coupled Static-Cyclic Impact Loads[J]. Chinese Journal of High Pressure Physics, 2022, 36(3): 034101. doi: 10.11858/gywlxb.20210879
Citation: FAN Lidan, XU Feng, YU Yongqiang, ZHANG Zhiwei, YU Liwei, ZHOU Guijie. Experimental Study of Dynamic Mechanical Characteristics of Sandstone under One-Dimensional Coupled Static-Cyclic Impact Loads[J]. Chinese Journal of High Pressure Physics, 2022, 36(3): 034101. doi: 10.11858/gywlxb.20210879

一维静载与循环冲击共同作用下砂岩动态力学特性试验研究

doi: 10.11858/gywlxb.20210879
基金项目: 国家自然科学基金(51874119);河南省科技攻关项目(212102310974)
详细信息
    作者简介:

    范利丹(1982-),女,硕士,副教授,主要从事新型建筑材料和地下工程支护材料研究.E-mail:lidanfan@hpu.edu.cn

    通讯作者:

    余永强(1972-),男,博士,教授,主要从事地下工程与岩土工程研究. E-mail:yyq@hpu.edu.cn

  • 中图分类号: O347; TU458

Experimental Study of Dynamic Mechanical Characteristics of Sandstone under One-Dimensional Coupled Static-Cyclic Impact Loads

  • 摘要: 以硬岩巷道的煤系砂岩为研究对象,利用改进的动静组合加载分离式霍普金森压杆系统进行轴压梯度为5、15、20 MPa,冲击气压梯度为0.8、1.0、1.2 MPa的一维循环冲击压缩试验。结果表明:整个循环冲击过程中,在不考虑轴压和冲击气压的情况下,砂岩的峰值应力随着冲击次数的增加呈现先增大后减小的变化趋势,而峰值应变、最大应变及平均应变率均呈现相反的变化趋势;在相同的冲击气压下,砂岩的峰值应力和累计循环冲击次数随轴压的增大而减小;在相同的轴压下,随着冲击气压的增大,峰值应力不断增大,而累计冲击次数却先增大后减小;在一维静载与循环冲击的共同作用下,砂岩的整个冲击过程可划分为压密阶段、内部裂纹发展阶段和加速破坏阶段。研究表明,地下深部矿柱失稳大概率是在静载与动载的相互作用下导致的,而动载的频繁扰动是矿柱失稳的主要影响因素。

     

  • 图  SHPB 试验装置

    Figure  1.  SHPB test apparatus

    图  SHPB试验装置示意图

    Figure  2.  Sketch of the SHPB system

    图  砂岩的动态应力均衡检验

    Figure  3.  Calibration of dynamic stress balance of sandstone

    图  一维动静组合加载模型示意图

    Figure  4.  Sketch of model under one-dimensional coupled static and dynamic loads

    图  砂岩试样循环冲击原始波形

    Figure  5.  Original waveforms of cyclic impacts for sandstone samples

    图  砂岩试样在循环冲击荷载下的应力-应变曲线

    Figure  6.  Stress-strain curves of sandstone subjected to cyclic impact

    图  峰值应力及最大应变与冲击次数的关系

    Figure  7.  Variations of peak stress and maximum strain with impact times

    图  峰值应力与循环冲击次数的关系

    Figure  8.  Relationship between peak stress and cyclic impact times

    图  最大应变与循环冲击次数的关系

    Figure  9.  Relationship between the maximum strain and cyclic impact times

    图  10  平均应变率与循环冲击次数的关系

    Figure  10.  Relationship between average strain rate and cyclic impact times

    图  11  冲击次数与冲击气压的关系

    Figure  11.  Relationship between impact times and impact pressure

    图  12  冲击次数与预加轴压的关系

    Figure  12.  Relationship between impact times and preloading axial pressure

    图  13  单位体积耗能与循环冲击次数的关系

    Figure  13.  Relationship between energy consumption per volume and cyclic impact times

    图  14  循环冲击作用下砂岩的破坏形态

    Figure  14.  Failure morphology of sandstone under cyclic impact loads

    图  15  循环冲击作用下砂岩的破坏模式

    Figure  15.  Failure mode of sandstone under cyclic impact loads

    表  1  砂岩的静态物理力学参数

    Table  1.   Static physical and mechanical parameters of sandstone

    fcu/MPaft/MPaE/GPa$\,\mu $v/(m·s−1)
    116.945.3031.250.263923
    下载: 导出CSV

    表  2  代表性试样的基本物理参数及加载方案

    Table  2.   Basic parameters of the representative samples and the loading scheme

    Sample No.L/mmD/mm$\,\rho $s/(kg·m−3)$\sigma $as/MPapc/MPa
    S3-1
    S3-2
    S3-3
    S3-4
    S3-5
    S3-6
    S3-7
    24.97
    25.26
    25.38
    25.26
    25.35
    25.04
    24.94
    49.56
    49.60
    49.53
    49.84
    49.90
    49.88
    49.65
    2591
    2571
    2567
    2561
    2580
    2564
    2628
    5
    15
    20
    15
    20
    15
    20
    0.8
    0.8
    0.8
    1.0
    1.0
    1.2
    1.2
    下载: 导出CSV

    表  3  代表性试样的总循环冲击次数

    Table  3.   Total number of the cyclic impacts of the representative samples

    S3-1S3-2S3-3S3-4S3-5S3-6S3-7
    1510811962
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-09-23
  • 修回日期:  2021-10-16
  • 刊出日期:  2022-05-30

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