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Study on Dynamic Characteristics and Fracture Mechanism of Coal Rock under Action of Mechanical-thermal Coupling
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Peng-long LI1a, 1b, Ning LUO1a, 1b, 2, Yun-chen SUO1a, 1b, Ya-bo CHAI1a, 1b, Rui SUN1a, 1b
Blasting | 2024, 41(4) : 8 - 17
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Blasting | 2024, 41(4): 8-17
• THEORETICAL AND TECHNOLOGICAL EXPLORATION •
Study on Dynamic Characteristics and Fracture Mechanism of Coal Rock under Action of Mechanical-thermal Coupling
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Peng-long LI1a, 1b, Ning LUO1a, 1b, 2, Yun-chen SUO1a, 1b, Ya-bo CHAI1a, 1b, Rui SUN1a, 1b
Affiliations
  • 1a.State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
  • 1b.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
  • 2.State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Published: 2024-12-01 doi: 10.3963/j.issn.1001-487X.2024.04.002
Outline
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To carry out deep coal mining safely and efficiently, the dynamic mechanical characteristics and fracture mechanism of coal rock in deep earth were investigated under the ‘three high and one disturbance’ environment. A dynamic impact test of coal rock was carried out using the self-improved ϕ 50 mm high temperature synchronous split Hopkinson pressure bar (SHPB) test equipment at temperatures between 25~200℃. A ZWT viscoelastic constitutive model was also improved to establish a dynamic constitutive equation considering the temperature effect. The influence of high temperature on crack development law and the dynamic strength of coal rock was investigated based on the coupling of the finite difference and discrete element methods. The results show four stages to the dynamic stress-strain curve of coal rock under high-temperature impact: compaction, elastic, crack propagation, and softening failure. The dynamic compressive strength and dynamic elastic modulus of coal rock significantly decrease as temperature increases. In contrast, the failure strain increases, and the absorbed energy varies in a W-shaped pattern. The fractal dimension increases linearly as the particle size decreases. The degree and complexity of the fragmentation mechanism increase as the compressive strength decreases. Although the improved dynamic constitutive model based on ZWT could adequately express the stress-strain relationship following a high-temperature impact, it does not apply to the compaction stage. According to the simulation and test results, water and adsorbed gas actively escape in the coal rock at 150℃. The coal matrix is also heated and expanded, which induces cracks. There are apparent mesoscopic cracks initially and gradually developed through cracks, mainly shear ones. The crack development of coal rock under dynamic compression at 100℃ develops through the impact surface, and the high temperature deteriorates the strength of coal rock.

deep coal rock  /  mechanical-thermal coupling  /  split Hopkinson pressure bar  /  dynamic constitutive model  /  finite difference-discrete element method
Peng-long LI, Ning LUO, Yun-chen SUO, Ya-bo CHAI, Rui SUN. Study on Dynamic Characteristics and Fracture Mechanism of Coal Rock under Action of Mechanical-thermal Coupling[J]. Blasting, 2024 , 41 (4) : 8 -17 . DOI: 10.3963/j.issn.1001-487X.2024.04.002
Funding
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  • National Key R&D Program(2020YFA0711800)
  • National Natural Science Foundation of China(12072363)
Appendix
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Year 2024 volume 41 Issue 4
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51
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Article Info
doi: 10.3963/j.issn.1001-487X.2024.04.002
  • Receive Date：2023-12-21
  • Online Date：2026-03-19
  • Published：2024-12-01
Article Data
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History
  • Received：2023-12-21
Funding
National Key R&D Program(2020YFA0711800)
National Natural Science Foundation of China(12072363)
Affiliations
    1a.State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
    1b.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
    2.State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Corresponding:

LUO Ning (1980-), male, Ph. D, professor and doctoral supervisor, mainly engaged in the research of explosion and impact dynamics (high-performance computing and impact protection theory), deep rock dynamics (resource and energy development and key mechanical problems) and other related science and technology, (E-mail) .
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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