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Strength and failure characteristics of coal measures mudstone specimens containing a prefabricated flaw under true triaxial tests

真三轴应力状态下含预制裂隙煤系泥岩强度与破坏特征

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Abstract

In this study, a series of coal measures mudstone specimens containing a prefabricated flaw were subjected to true triaxial test (TTT), namely, specimens of the intermediate principal stress (σ2) parallel to prefabricated flaw (TTT-Flaw-2) and specimens of the minimum principal stress (σ3) parallel to prefabricated flaw (TTT-Flaw-3). The main objective of this study was to investigate the effects of the loading direction of σ2 and the position of prefabricated flaw on the strength and failure modes of specimens. The results showed that the peak strength of intact and flawed specimens first increased and then decreased with increasing σ2, which could be fitted by the Mogi-Coulomb criterion. Under the same loading stresses, the strength of intact specimen was larger than that of flawed specimens, and specimens TTT-Flaw-2 had the lowest strength. The X-ray computerized tomography scanning results revealed that fractures were not always observed to form along the prefabricated flaw tips but were distributed randomly inside the specimen under conventional triaxial test conditions. Under TTT conditions, anti-wing cracks initiated from the vicinity of the prefabricated flaw tip and were observed in σ2-drrection for specimens TTT-Flaw-2. While for specimens TTT-Flaw-3, shear cracks appeared in σ2-direction, and few anti-wing cracks were observed in σ3-direction.

摘要

对一系列含有预制缺陷的煤系泥岩试样进行了真三轴试验(TTT), 即中间主应力(σ2)平行于预制 缺陷的试样(TTT-Flaw-2)和最小主应力平行于预制缺陷的试样(σ3)(TTT-Flaw-3), 研究σ2 加载方向和预 制缺陷的位置对试样强度和破坏模式的影响。结果表明, 完整试样和含预制缺陷试样的峰值强度随σ2 的增加先增大后减小, 符合Mogi-Coulomb 准则。在相同的应力条件下, 符合Mogi-Coulomb 准则。在相同的应力条件下, 且TTT-Flaw-2 试样的强度最低。CT 扫描结果显示, 在常规三轴试验条件下, 含预制缺陷试样中的裂纹并不总是沿着预制缺陷尖端形成, 而是随机分布在试样内部; 在TTT-Flaw-2 试样中, 反翼型裂纹从预制缺陷尖端附近开始形成, 最终主要分布在σ2 加载方向上; 而在TTT-Flaw-3 试样中, 在σ2 加载方向上出现剪切裂纹, 而在σ3 加载方向上几乎没有观察到反翼型裂纹。

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Authors and Affiliations

  1. Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao, 266590, China

    Wen-shuai Li  (李文帅) & Xu-xu Yang  (杨旭旭)

  2. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Bang-you Jiang  (蒋邦友)

  3. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, 232001, China

    Zhao-lin Li  (李兆霖)

  4. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Lian-guo Wang  (王连国)

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  1. Wen-shuai Li  (李文帅)
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  2. Bang-you Jiang  (蒋邦友)
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  3. Zhao-lin Li  (李兆霖)
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  4. Lian-guo Wang  (王连国)
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Contributions

LI Wen-shuai and JIANG Bang-you provided the concept. LI Wen-shuai and LI Zhao-lin carried out the experiment and wrote the draft of the manuscript. YANG Xu-xu analyzed the experimental data. WANG Lian-guo reviewed the manuscript. LI Wen-shuai and LI Zhao-lin replied to reviewers’ comments and revised the manuscript.

Corresponding authors

Correspondence to Bang-you Jiang  (蒋邦友) or Zhao-lin Li  (李兆霖).

Ethics declarations

LI Wen-shuai, JIANG Bang-you, LI Zhao-lin, WANG Lian-guo and YANG Xu-xu declare that they have no conflict of interest.

Additional information

Foundation item: Projects(52204144, 52004144) supported by the Natural Science Foundation of China; Project(ZR2022QE232) supported by the Natural Science Foundation of Shandong Province, China

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Li, Ws., Jiang, By., Li, Zl. et al. Strength and failure characteristics of coal measures mudstone specimens containing a prefabricated flaw under true triaxial tests. J. Cent. South Univ. 31, 196–209 (2024). https://doi.org/10.1007/s11771-024-5563-1

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