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Geomechanics and Engineering Volume 32, Number 2, January25 2023 , pages 233-244 DOI: https://doi.org/10.12989/gae.2023.32.2.233 |
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Mechanical deterioration and thermal deformations of high-temperature-treated coal with evaluations by EMR |
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Biao Kong, Sixiang Zhu, Wenrui Zhang, Xiaolei Sun, Wei Lu and Yankun Ma
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| Abstract | ||
| With the increasing amount of resources required by the society development, mining operations go deeper, which raises the requirements of studying the effects of temperature on the physical and mechanical properties of coal and adjacent rock. For now, these effects are yet to be fully revealed. In this paper, a mechanical-electromagnetic radiation (EMR) test system was established to understand the mechanical deterioration characteristics of coal by the effect of thermal treatment and its deformation and fracture characteristics under thermo-mechanical coupling conditions. The mechanical properties of high-temperature-treated coal were analyzed and recorded, based on which, reasons of coal mechanical deterioration as well as the damage parameters were obtained. Changes of the EMR time series under unconstrained conditions were further analyzed before characteristics of EMR signals under different damage conditions were obtained. The evolution process of thermal damage and deformation of coal was then analyzed through the frequency spectrum of EMR. In the end, based on the time-frequency variation characteristics of EMR, a method of determining combustion zones within the underground gasification area and combustion zones's stability level was proposed. | ||
| Key Words | ||
| coal; EMR; mechanical deterioration; stability evaluation; temperature | ||
| Address | ||
| Biao Kong: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; Engineering Technology Research Centre for Safe and Efficient Coal Mining (Anhui University of Science and Technology), Huainan, 232001, China; State Key Laboratory of Coal Mine Safety Technology, China Coal Technology & Engineering Group Shenyang Research Institute, Shenyang, 113122, China Sixiang Zhu and Xiaolei Sun: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China Wenrui Zhang and Wei Lu: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; Engineering Technology Research Centre for Safe and Efficient Coal Mining (Anhui University of Science and Technology), Huainan, 232001, China Yankun Ma: Engineering Technology Research Centre for Safe and Efficient Coal Mining (Anhui University of Science and Technology), Huainan, 232001, China | ||