Energy evolution and structural health monitoring of coal under different failure modes: an experimental study

Yarong Xue; Xueqiu He; Dazhao Song; Zhenlei Li; Majid Khan; Taoping Zhong; Fei Yang

doi:10.1007/s12613-024-2822-y

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Yarong Xue, Xueqiu He, Dazhao Song, Zhenlei Li, Majid Khan, Taoping Zhong, and Fei Yang, Energy evolution and structural health monitoring of coal under different failure modes: an experimental study, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2822-y

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Yarong Xue, Xueqiu He, Dazhao Song, Zhenlei Li, Majid Khan, Taoping Zhong, and Fei Yang, Energy evolution and structural health monitoring of coal under different failure modes: an experimental study, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2822-y

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Research Article

Energy evolution and structural health monitoring of coal under different failure modes: an experimental study

+ Author Affiliations

Corresponding author:
Xueqiu He E-mail: hexq@ustb.edu.cn
Received: 10 August 2023; Revised: 27 December 2023; Accepted: 2 January 2024; Available online: 3 January 2024

Abstract

Abstract

Structural instability in underground engineering, especially in coal–rock structures, poses significant safety risks. Thus, the development of an accurate monitoring method for the health of coal–rock bodies is crucial. The focus of this work is on understanding energy evolution patterns in coal–rock bodies under complex conditions by using shear, splitting, and uniaxial compression tests. We examine the changes in energy parameters during various loading stages and the effects of various failure modes, resulting in an innovative energy dissipation-based health evaluation technique for coal. Key results show that coal bodies go through transitions between strain hardening and softening mechanisms during loading, indicated by fluctuations in elastic energy and dissipation energy density. For tensile failure, the energy profile of coal shows a pattern of “high dissipation and low accumulation” before peak stress. On the other hand, shear failure is described by “high accumulation and low dissipation” in energy trends. Different failure modes correlate with an accelerated increase in the dissipation energy before destabilization, and a significant positive correlation is present between the energy dissipation rate and the stress state of the coal samples. A novel mathematical and statistical approach is developed, establishing a dissipation energy anomaly index, W, which categorizes the structural health of coal into different danger levels. This method provides a quantitative standard for early warning systems and is adaptable for monitoring structural health in complex underground engineering environments, contributing to the development of structural health monitoring technology.
- energy dissipation;
- structural health monitoring;
- early warning;
- coal–rock mechanics;
- failure mode

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References(37)

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