Abstract
The mechanical behavior evolution characteristics of sandstone are important to the application and practice of rock engineering. Therefore, a new method and concept of deep rock mechanics testing are proposed to reveal the mechanical behavior evolution mechanism of deep roadway surrounding rock after excavation with a depth over 1000 m. High stress-seepage coupling experiments of deep sandstone under various confining pressures are conducted using GCTS. Stress — strain and permeability curves are obtained. The three-stage mechanical behavior of deep sandstone is better characterized. A platform and secondary compaction phenomena are observed. With the confining pressure increasing, the platform length gradually decreases, even disappears. In the stade I, the rigid effect of deep sandstone is remarkable. In the stage II, radial deformation of deep sandstone dominates. The transient strain of confining pressure compliance is defined, which shows three-stage evolution characteristics. In the stage III, the radial deformation is greater than the axial deformation in the pre-peak stage, but the opposite trend is observed in the post-peak stage. It is found that the dynamic permeability can be more accurately characterized by the radial strain. The relations between the permeability and stress-strain curves in various stages are revealed.
摘要
砂岩的力学行为演化特征对岩石工程的应用与实践很重要. 为此, 本文提出了一种新的深部岩石力学测试方法与概念, 以便揭示超千米深井巷道在开挖后围岩力学行为的演化机制. 采用GCTS 多场耦合伺服系统, 对深部砂岩进行了不同围压条件下的高应力-渗流耦合试验, 获得的应力-应变及渗透率演化曲线, 较好地表征了深部砂岩“三阶段”加载下的力学行为特征. 本文发现了“平台”及二次压密现象, 并且随着围压的增加, 平台的长度逐渐变短, 甚至消失. 在I 阶段, 深部砂岩具有显著的刚化效应. 在II 阶段, 深部砂岩的径向变形占据主导地位. 此外, 定义了瞬态应变围压柔量, 该参量曲线呈现出显著的三阶段演化特征. 在III 阶段, 深部砂岩的峰前径向变形超前于轴向变形, 峰后则与之相反. 另外, 发现了径向应变更能灵敏表征渗透率动态变化, 并揭示了渗透率曲与应力-应变曲线各阶段之间的对应关系.
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Projects(51974319, 52034009) supported by the National Natural Science Foundation of China; Project(2020JCB01) supported by the China University of Mining and Technology (Beijing)
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ZHANG Jun-wen provided the concept, idea and supervision of manuscript, gave the funding acquisition and provided the resources for the manuscript. SONG Zhi-xiang conducted the literature review, wrote the first draft of the manuscript and edited the draft of manuscript. WANG Shan-yong provided the re-supervision of manuscript.
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ZHANG Jun-wen, SONG Zhi-xiang, and WANG Shan-yong declare that they have no conflict of interest.
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Zhang, Jw., Song, Zx. & Wang, Sy. Mechanical behavior of deep sandstone under high stress-seepage coupling. J. Cent. South Univ. 28, 3190–3206 (2021). https://doi.org/10.1007/s11771-021-4791-x
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DOI: https://doi.org/10.1007/s11771-021-4791-x