Numerical Simulation of Longwall Face Mining Stress Evolution Based on the Nonlinear Compression Characteristics of Goaf Gangue
Publication: International Journal of Geomechanics
Volume 23, Issue 8
Abstract
The nonlinear compression mechanical properties of broken gangue in goaf directly affect the stress, deformation, and failure characteristics of mining strata. A numerical simulation is an effective approach when analyzing engineering issues during coal seam mining. Therefore, the appropriate material model and reasonable material parameters of the goaf gangue are critical in the study of the mechanical properties and mining stress evolution law. This paper adopted the double-yield (D-Y) material model to characterize the mechanical properties of goaf gangue. It established the corresponding relationship between the Salamon constitutive equation and D-Y material model parameters. Then, the numerical simulation of roof caving, gangue stack, and gangue compression during coal seam mining was realized using FLAC3D. A numerical model of longwall working face mining was established based on typical coal mining geological conditions to determine the stress evolution law in the roof and floor strata. The synchronous variation law in the vertical (σz) and horizontal stresses in the roof strata was opposite, and it was consistent in the floor strata. Finally, the evolution laws were equivalent converted into the mining triaxial compression (MTC) path, in which the mining roof triaxial compression (MRTC) path presented an S-shape, and the mining floor triaxial compression (MFTC) path presented a reverse S-shape. The results of this paper could be a basis for the study of the mechanical properties when mining rock and strata control.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (51874280) and the Natural Science Foundation of Jiangsu Province (BK20210520).
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 23 • Issue 8 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Nov 20, 2022
Accepted: Mar 5, 2023
Published online: May 24, 2023
Published in print: Aug 1, 2023
Discussion open until: Oct 24, 2023
ASCE Technical Topics:
- Coal mining
- Compression
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Floors
- Geotechnical engineering
- Material mechanics
- Material properties
- Materials engineering
- Mechanical properties
- Mines and mining
- Models (by type)
- Numerical models
- Roofs
- Solid mechanics
- Structural dynamics
- Structural engineering
- Structural systems
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