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Study on the Law of Failure Acoustic–Thermal Signal of Weakly Cemented Fractured Rock with Different Dip Angles

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Abstract

The diagenetic environment and geological conditions in the west are special, and weakly cemented rocks with low strength, poor cementation and well-developed fissures are widely distributed in coal measure strata. Considering the changes of acoustic emission and thermal infrared signals in the process of rock fracture, it is of great significance to study the characteristics of acoustic–thermal signals in the failure process of weakly cemented fractured rocks for expanding the analysis methods of rock fracture laws. In order to study the evolution law of acoustic–thermal signal in the failure process of weakly cemented fractured rocks with different dip angles, biaxial compression tests were carried out on the weakly cemented sandstone samples of Hongqingliang coal mine. Monitoring was carried out, and a joint analysis index of acoustic–thermal sensitivity was proposed. The research results show that the time series sensitivity of the combined acoustic–thermal index is in the order of medium-dip fractured rocks (30–60°) > small-dip fractured rocks (0–30°) > high-dip fractured rocks (60–90°); The peak sensitivity of the joint index is in the order of high-dip fractured rocks (60–90°) > medium-dip fractured rocks (30–60°) > small-dip fractured rocks (0–30°); The thermal infrared temperature signal is earlier than the acoustic emission signal, and the joint index can reduce the hysteresis of acoustic emission signal and the spatial limitation of thermal infrared. The above research can provide a useful reference for solving the large deformation of the surrounding rock of the roadway in the weakly cemented coal measure stratum and ensuring the long-term stability of the rock mass engineering.

Highlights

  • Crack propagation in weakly cemented rock.

  • Combined measurement of digital speckle correlation method, acoustic emission and thermal infrared.

  • Biaxial visual test of pre-cracked rock.

  • Characteristics of AE events with different pre-angle cracked rock.

  • Characteristics of thermal infrared with different pre-angle cracked rock.

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All data, models, and code generated or used during the study appear in the submitted article.

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Acknowledgements

The research was financially supported by Major Program of Shandong Provincial Natural Science Foundation (ZR2019ZD13), Project of Taishan Scholar in Shandong Province (2021-018), Key Projects of the Joint Fund for Regional Innovation and Development (U21A20110), Natural Science Foundation of Shandong Province (ZR2022ME165 and ZR2022ME060), and Dr. Scientific Research Fund of Liaocheng University (318052263).

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Authors and Affiliations

  1. School of Architecture and Engineering, Liaocheng University, Liaocheng, 252000, China

    Wei Zhang & Baoliang Zhang

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

    Tongbin Zhao

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  1. Wei Zhang
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  2. Baoliang Zhang
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  3. Tongbin Zhao
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Correspondence to Tongbin Zhao.

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Zhang, W., Zhang, B. & Zhao, T. Study on the Law of Failure Acoustic–Thermal Signal of Weakly Cemented Fractured Rock with Different Dip Angles. Rock Mech Rock Eng 56, 4557–4568 (2023). https://doi.org/10.1007/s00603-023-03296-1

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  • DOI: https://doi.org/10.1007/s00603-023-03296-1

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