三轴压缩条件下单裂隙岩样裂隙扩展研究
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长江大学

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TU45

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岩土力学与工程国家重点实验室开放基金(Z020013);陕西省混凝土结构安全与耐久性重点实验室开放基金(SZ02105);湖北省荆州市科技计划项目(2020AC15)


Triaxial compression condition order fracture rock fissure extension study
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Yangtze University

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    摘要:

    为研究岩石中裂纹的起裂、扩展和破坏规律,采用PFC2D数值模拟软件结合室内试验对预制单裂隙岩样进行分析。结果表明:(1)当围压为7MPa时,以剪切-拉伸复合破坏模式为主;当围压为14MPa时,试样以“Y”型剪切破坏、单一斜剪破坏模式为主;当围压为21MPa时,试样以“X”型剪切破坏模式为主。(2)试样的破坏模式与围压的大小密切相关,当裂隙长度一定时,随着围压的增大,试样的破坏越明显;当围压一定时,随着裂隙长度的增加,裂纹扩展的规模越大。(3)随着裂隙长度的增加,岩样的峰值强度、弹性模量、起裂应力与损伤应力均呈下降趋势;随着围压的增大,各力学参数均增大,裂隙长度越大时更易诱发新生裂纹,试样强度特性降低。(4)剪切裂纹在整个模拟加载过程中占主导地位且数量始终占比较大;随着围压的增大,拉裂纹逐步占据主导地位,且当围压为21MPa,裂隙长度为39mm时,拉裂纹是剪裂纹的2.73倍;当围压一定时,随着裂隙长度的增加,拉裂纹占比也逐渐减少。

    Abstract:

    In order to study the law of crack initiation, propagation and failure in rock,, using PFC2D numerical simulation software with indoor test analysis of precast single fracture rock sample. The results show that: (1) When the confining pressure is 7MPa, the shear-tensile composite failure mode is the main failure mode; When the confining pressure is 14MPa, the specimen mainly adopts "Y" shear failure mode and single oblique shear failure mode; When the confining pressure is 21MPa, the specimen mainly adopts the "X" shear failure mode. (2) The failure mode of the sample is closely related to the confining pressure. When the length of the crack is constant, the failure of the sample becomes more obvious with the increase of the confining pressure. When the confining pressure is constant, the scale of crack propagation increases with the increase of crack length. (3) The peak strength, elastic modulus, crack initiation stress and damage stress of rock samples all decrease with the increase of crack length; With the increase of confining pressure, all mechanical parameters increase, and with the increase of crack length, it is more likely to induce new cracks, and the strength characteristics of samples decrease. (4) Shear cracks play a dominant role in the whole simulated loading process and their number is always large; With the increase of confining pressure, the tensile crack gradually plays a dominant role. When the confining pressure is 21MPa and the crack length is 39mm, the tensile crack is 2.73 times of the shear crack. When the confining pressure is constant, the proportion of tensile cracks decreases gradually with the increase of crack length.

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陈祥. 三轴压缩条件下单裂隙岩样裂隙扩展研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-11-26
  • 最后修改日期:2022-03-28
  • 录用日期:2022-04-30
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