饱水细砂岩动态抗拉与抗压强度试验对比研究

王光勇 余锐 马东方 侯远

王光勇, 余锐, 马东方, 侯远. 饱水细砂岩动态抗拉与抗压强度试验对比研究[J]. 高压物理学报, 2020, 34(4): 044101. doi: 10.11858/gywlxb.20190857
引用本文: 王光勇, 余锐, 马东方, 侯远. 饱水细砂岩动态抗拉与抗压强度试验对比研究[J]. 高压物理学报, 2020, 34(4): 044101. doi: 10.11858/gywlxb.20190857
WANG Guangyong, YU Rui, MA Dongfang, HOU Yuan. Comparative Study on Dynamic Tensile and Compressive Strength of the Saturated Fine Sandstone[J]. Chinese Journal of High Pressure Physics, 2020, 34(4): 044101. doi: 10.11858/gywlxb.20190857
Citation: WANG Guangyong, YU Rui, MA Dongfang, HOU Yuan. Comparative Study on Dynamic Tensile and Compressive Strength of the Saturated Fine Sandstone[J]. Chinese Journal of High Pressure Physics, 2020, 34(4): 044101. doi: 10.11858/gywlxb.20190857

饱水细砂岩动态抗拉与抗压强度试验对比研究

doi: 10.11858/gywlxb.20190857
基金项目: 国家自然科学基金-山西煤基低碳联合基金重点支持项目(U1810203)
详细信息
    作者简介:

    王光勇(1977—),男,博士,副教授,硕士生导师,主要从事岩土工程动载试验研究. E-mail:wgy2003@mail.ustc.edu.cn

  • 中图分类号: O347.3; TU45

Comparative Study on Dynamic Tensile and Compressive Strength of the Saturated Fine Sandstone

  • 摘要: 使用霍普金森压杆(SHPB)装置对天然状态和饱水状态下的细砂岩进行单轴动态压缩试验和动态劈裂试验,研究水和加载速率对细砂岩动态抗拉、抗压强度的影响及其差异性,并且结合数字图像相关(DIC)技术,分析细砂岩动态抗拉、抗压时的破坏机制。试验结果表明:两种状态下的细砂岩动态抗拉、抗压强度有明显的率效应,随着加载速率的增大而增大,且相同加载速率下,细砂岩在饱水状态下比天然状态下的动态抗压强度小,而抗拉强度比天然状态下的大;水的存在对细砂岩动态抗压强度和抗拉强度的应变率效应影响不大,但水能提高细砂岩动态抗压和抗拉强度增强因子,并且对细砂岩动态抗拉强度增强因子的提高更显著;在动态受压过程中饱水状态岩样表面的应变集中处较天然状态下明显更少,应变梯度更显著,在动态受拉过程中拉剪效果被削弱。

     

  • 图  SHPB装置实物

    Figure  1.  Picture of actual SHPB equipment

    图  波形整形前后对比

    Figure  2.  Comparison before and after waveform shaping

    图  SHPB装置示意图

    Figure  3.  Schematic of SHPB experiment

    图  动态试验试样

    Figure  4.  Specimens under dynamic tests

    图  应力平衡曲线

    Figure  5.  Curves of stress balance

    图  不同加载速率下细砂岩的应力-应变曲线

    Figure  6.  Stress-strain curves of the fine sandstone under different loading rates

    图  不同加载速率下细砂岩的动态抗压强度曲线

    Figure  7.  Relationship curves of dynamic compressive strength with different loading rates of the fine sandstone

    图  动载下天然岩样表面出现裂纹瞬时应变云图

    Figure  8.  Instantaneous strain nephogram of a natural rock specimen with the crack appearing on the surface under dynamic load

    图  动载下饱水岩样表面出现裂纹瞬时应变云图

    Figure  9.  Instantaneous strain nephogram of a saturated rock specimen with the crack appearing on the surface under dynamic load

    图  10  不同加载速率下细砂岩动态拉应力-时间曲线

    Figure  10.  Dynamic tensile stress-time curves of the fine sandstone under different loading rates

    图  11  不同加载速率下细砂岩的动态抗拉强度曲线

    Figure  11.  Relationship curves of dynamic tensile strength with different loading rates of the fine sandstone

    图  12  动态劈裂试验中天然状态岩样表面出现裂纹瞬时应变云图

    Figure  12.  Instantaneous strain nephogram of a natural rock sample with the crack appearing on the surface in dynamic splitting test

    图  13  动态劈裂试验中饱水状态岩样表面出现裂纹瞬时应变云图

    Figure  13.  Instantaneous strain nephogram of a saturated rock sample with the crack appearing on the surface in dynamic splitting test

    图  14  不同加载速率下饱水状态和天然状态岩样的动态强度增强因子关系曲线

    Figure  14.  Relationship curves of dynamic strength increasing factors for saturated and natural rock specimens under different loading rates

    表  1  试验分组

    Table  1.   Test group

    Type of testState of rock samplesGroupLoading rate/(m·s–1Temperature/℃
    Compression testNatural stateA-18.0120
    A-25.6220
    A-32.9320
    Saturation stateA-48.2720
    A-55.1220
    A-62.0520
    Splitting testNatural stateB-18.6520
    B-25.2820
    B-31.8720
    Saturation stateB-48.8920
    B-55.3420
    B-61.4420
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-11-15
  • 修回日期:  2019-12-01
  • 发布日期:  2020-02-25

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