龙马溪页岩应力-应变门槛值的各向异性特征研究

徐荣超; 靳一鼎; 李日运; 李震; 张圣哲

doi:10.11779/CJGE202112016

龙马溪页岩应力-应变门槛值的各向异性特征研究 English Version

1.
华北水利水电大学地球科学与工程学院,河南　郑州　450046
2.
中国电建集团北京勘测设计研究院有限公司,北京　100024
3.
河南理工大学土木工程学院,河南　焦作　454003

基金项目:

国家自然科学基金项目 51709113

国家自然科学基金项目 51704097

河南理工大学自然科学基金项目 J2021-2

详细信息

作者简介:
徐荣超(1988— ),男,副教授,博士,主要从事深部岩体工程动力灾害防治方面的研究工作。E-mail：rcxirsm@126.com

通讯作者:
李震, E-mail：zhenli@hpu.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2021-04-13
- 网络出版日期: 2022-11-30
- 刊出日期: 2021-11-30

Anisotropic characteristics of stress and strain thresholds of Longmaxi shale

1.
College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
2.
PowerChina Beijing Engineering Corporation, Beijing100024, China
3.
School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China

摘要

摘要: 层理面与围压共同作用下,应力门槛值及其对应应变的各向异性特征是影响页岩脆性力学行为的重要因素之一。以龙马溪组页岩为对象,分析其应力-应变门槛值在不同围压及不同层理面倾角影响下的变化规律。结果表明：①起裂应力 $σ_{ci}$ ,损伤应力 $σ_{cd}$ 和峰值应力 $σ_{f}$ 随围压增大均近似成线性规律增大,而闭合应力 $σ_{cc}$ 受围压影响不大。②层理面倾角对 $σ_{cd}$ , $σ_{f}$ 具有显著影响,而对 $σ_{cc}$ , $σ_{ci}$ 影响不明显；低围压下应力比 $σ_{cd}$ / $σ_{f}$ , $σ_{ci}$ / $σ_{f}$ , $σ_{cc}$ / $σ_{f}$ 随倾角增加表现出一定的波动性,随着围压增大应力比趋于稳定。③应力门槛值对应的轴向及径向应变随围压增大表现出相同的变化规律：峰值应变增长速率最快,损伤应变次之,起裂应变最小。④应力门槛值对应的轴向及径向应变随倾角的增大表现出相同的变化规律：峰值应变随倾角由0°增大为90°,先减小后增大,闭合应变、起裂应变及损伤应变与倾角的相关性不强。
- 页岩 /
- 应力门槛值 /
- 应变 /
- 各向异性 /
- 三轴试验
Abstract: Under the combined action of bedding plane and confining pressure, the anisotropic characteristics of the stress thresholds and the corresponding strains are one of the important factors affecting the brittle mechanical behaviors of shale. Taking Longmaxi formation shale as an example, the variation laws of stress-strain thresholds under different confining pressures and different bedding plane dip angles are analyzed. The results show that: (1) The crack initiation stress $σ_{ci}$ , damage stress $σ_{cd}$ and peak stress $σ_{f}$ increase approximately linearly with the increase of the confining pressure, while the closure stress $σ_{cc}$ is not affected by the confining pressure. (2) The dip angle of bedding plane has a significant effect on $σ_{cd}$ and $σ_{f}$ , while $σ_{cc}$ and $σ_{ci}$ are not affected by the dip angle. Under the low confining pressure, the stress ratios $σ_{cd}$ / $σ_{f}$ , $σ_{ci}$ / $σ_{f}$ and $σ_{cc}$ / $σ_{f}$ fluctuate with the increase of the dip angle, and tend to be stable with the increase of the confining pressure. (3) The axial strains and radial strains corresponding to the stress thresholds show the same change rules with the increase of the confining pressure: the peak strain increases the fastest, followed by the damage strain, and the crack initiation strain is the smallest. (4) The axial strains and radial strains corresponding to the stress thresholds show the same change laws with the increase of the inclination angle: the peak strain decreases first and then increases with the increase of the inclination angle from 0° to 90°, and the closure strain, crack initiation strain and damage strain are not strongly related to the dip angle.
- shale /
- stress threshold /
- strain /
- anisotropic characteristic /
- triaxial compression test

HTML全文

致谢: 衷心感谢四川大学能源工程安全与灾害力学教育部重点实验室何柏教授、谢凌志教授提供的页岩三轴试验数据！

图 1 页岩应力门槛值随围压变化曲线

Figure 1. Variation of stress threshold of shale with confining pressure

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图 2 页岩应力门槛值与峰值之比随围压变化曲线

Figure 2. Variation of ratio of stress threshold to peak strength with confining pressure

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图 3 页岩应力门槛值与θ关系曲线

Figure 3. Curves of stress threshold with dip angle

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图 4 页岩应力比与θ关系曲线

Figure 4. Curves of ratio of stress threshold to peak strength with dip angle

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图 5 应变门槛值随围压变化曲线

Figure 5. Curves of strain threshold with confining pressure

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图 6 应变比值随围压变化曲线

Figure 6. Variation of strain ratio with confining pressure

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图 7 应力门槛值与θ关系曲线

Figure 7. Variation of strain threshold with dip angle

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图 8 应变比随θ变化曲线

Figure 8. Variation of strain ratio with dip angle

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