| 含裂缝页岩在围压下力学特性及破坏模式 |
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| 引用本文： | 张家伟,刘向君,熊健,梁利喜,张文.含裂缝页岩在围压下力学特性及破坏模式[J].科学技术与工程,2023,23(17):7300-7309. |
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| 作者姓名： | 张家伟 刘向君 熊健 梁利喜 张文 |
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| 作者单位： | 西南石油大学 |
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| 摘 要： | 以含缺陷岩石为研究对象，通过离散元法生成不同数量和角度的裂隙，研究裂隙数量、分布模式以及在围压条件对岩石力学特性和破坏模式的影响，结果表明：随着裂隙数量的增加，岩样的抗压强度呈现负指数变化，弹性模量呈现线性下降;随着裂隙数量和围压的增加岩样破坏对应的新裂缝数量随之减少，角度主要集中在90°左右并服从正态分布，围压对新裂缝不对称性具有抑制作用。垂直于最大主应力方向的原生裂缝对应力具有屏蔽作用，但围压可以有效减轻这种应力屏蔽作用。建立损伤变量力学评价方法，定量分析了裂隙数量和岩石损伤变量之间的关系。
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| 关 键 词： | 页岩 裂缝数量 分布模式 力学性质 评价方法 |
| 收稿时间： | 2022/9/6 0:00:00 |
| 修稿时间： | 2023/5/23 0:00:00 |
Research on mechanics and failure modes of fractured shale under different confining pressures |
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| Zhang Jiawei,JUN,Xiong Jian,Liang Lixi,Zhang Wen.Research on mechanics and failure modes of fractured shale under different confining pressures[J].Science Technology and Engineering,2023,23(17):7300-7309. |
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| Authors: | Zhang Jiawei JUN Xiong Jian Liang Lixi Zhang Wen |
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| Affiliation: | Southwest Petroleum University |
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| Abstract: | Taking the defective rock as the research object, the number and angle of cracks are generated by discrete element software, and the number and distribution mode of cracks and the influence of confining pressure on the mechanical properties and failure mode of rock are studied. The results show that with the increase of the number of rock cracks, the compressive strength of shale shows a negative exponential change, and the elastic modulus shows a linear decrease. With the increase of the number of cracks and confining pressure, the number of new cracks corresponding to shale failure decreases. The new crack angle is mainly concentrated at about 90 °, which obeys the normal distribution. The confining pressure has an inhibitory effect on the asymmetry of new cracks. The primary cracks perpendicular to the direction of the maximum principal stress have a shielding effect on the stress, but the confining pressure can effectively reduce this stress shielding effect. A mechanical evaluation method of damage variable is established to quantitatively analyze the relationship between the number of cracks and rock damage variable. |
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| Keywords: | Shale number of fractures distribution mode mechanical properties evaluation method |
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