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Effects of Temperature and Liquid Nitrogen (LN2) on Coal’s Mechanical and Acoustic Emission (AE) Properties

Teng Teng1,2, Yuhe Cai3, Linchao Wang3,*, Yanzhao Zhu2

1 Inner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos, 017001, China
2 Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology-Beijing, Beijing, 100083, China
3 School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an, 710048, China

* Corresponding Author: Linchao Wang. Email: email

(This article belongs to the Special Issue: Fluids, Materials and Related Disasters in Geotechnical and Mining Engineering)

Fluid Dynamics & Materials Processing 2024, 20(6), 1181-1202. https://doi.org/10.32604/fdmp.2023.044532

Abstract

Liquid nitrogen has shown excellent performances as a good fracturing medium in the extraction of unconventional natural gas, and its application in coalbed methane extraction is currently a research hotspot. This study focuses on the acoustic emission properties of coal specimens treated utilizing liquid nitrogen with varying initial temperatures in a three-point bending environment. Through examination of the load-displacement curves of the considered coal samples, their mechanical properties are also revealed for different initial temperatures and cycling frequencies. The findings demonstrate a gradual decline in the maximum load capacity of coal rock as the temperature rises. Similarly, when subjected to the same temperature, an escalation in the cycling frequency leads to a reduction in the peak load of coal rock. This suggests that both temperature and cycling frequency exert a notable impact on the fracturing efficacy of liquid nitrogen. Freeze-thaw cycling treatments and exposure to high-temperature conditions can activate preexisting damage in the coal rock, and, accordingly, influence its mechanical properties. In particular, throughout the progressive loading of coal rock samples, the failure mechanisms are predominantly characterized by the occurrence of tensile cracks, succeeded by the development, spread, and fracture of shear fissures.

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APA Style
Teng, T., Cai, Y., Wang, L., Zhu, Y. (2024). Effects of temperature and liquid nitrogen (LN2) on coal’s mechanical and acoustic emission (AE) properties. Fluid Dynamics & Materials Processing, 20(6), 1181-1202. https://doi.org/10.32604/fdmp.2023.044532
Vancouver Style
Teng T, Cai Y, Wang L, Zhu Y. Effects of temperature and liquid nitrogen (LN2) on coal’s mechanical and acoustic emission (AE) properties. Fluid Dyn Mater Proc. 2024;20(6):1181-1202 https://doi.org/10.32604/fdmp.2023.044532
IEEE Style
T. Teng, Y. Cai, L. Wang, and Y. Zhu "Effects of Temperature and Liquid Nitrogen (LN2) on Coal’s Mechanical and Acoustic Emission (AE) Properties," Fluid Dyn. Mater. Proc., vol. 20, no. 6, pp. 1181-1202. 2024. https://doi.org/10.32604/fdmp.2023.044532



cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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