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ORIGINAL RESEARCH article

Front. Mater.
Sec. Mechanics of Materials
Volume 11 - 2024 | doi: 10.3389/fmats.2024.1456590

Exploring the dynamic mechanical response and mesoscopic characteristics of typical frozen rock in Yulong Copper Mine

Provisionally accepted
Shoudong Xie Shoudong Xie 1Chengjie Li Chengjie Li 2*Ying Xu Ying Xu 2Zhongyi Zhang Zhongyi Zhang 2Mengqi Wang Mengqi Wang 2Qi An Qi An 2
  • 1 Hongda Blasting Engineering Group Co., Ltd., Guangzhou, China, Guangzhou, China
  • 2 Anhui University of Science and Technology, Huainan, China

The final, formatted version of the article will be published soon.

    Dynamic mechanical characteristic testing at low temperatures was conducted for the typical porphyry and sandstone specimens of Yulong Copper Mine in Tibet, China. The stress and strain characteristics of the specimens at different temperatures were analyzed. A dynamic constitutive model was developed by considering the initial damage. Furthermore, microscopic damage characteristics during the water-saturated rock freezing process were investigated using the PFC3D software, revealing the mechanisms of frost heave damage to rocks. The results indicated that the water-ice phase transition either enhanced or deteriorated the specimen strength at low temperatures. Specifically, freezing at -10℃ and -20℃ enhanced the strength of sandstone. However, freezing at -10℃ enhanced the porphyry specimens, and freezing at -20℃ caused significant frost swelling injury. The new constitutive equation effectively fitted the dynamic stress and strain curves for both specimens, highlighting their differences. The maximum contact force and particle contact in the frozen rock PFC3D model were affected by rock and water particle deformations. The frost swelling deformation of water particles had a more pronounced impact on specimen damage and was related to the temperature. A specific freezing temperature existed at which the increase in saturated rock strength corresponded to the maximum specimen strength at that temperature.

    Keywords: water-ice phase transition, Dynamic mechanical property, Constitutive equation, frost swelling injury, PFC3D

    Received: 28 Jun 2024; Accepted: 31 Oct 2024.

    Copyright: © 2024 Xie, Li, Xu, Zhang, Wang and An. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Chengjie Li, Anhui University of Science and Technology, Huainan, China

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