Numerical analysis on the factors affecting post-peak characteristics of coal under uniaxial compression

The post-peak characteristics of coal serve as a direct reflection of its failure process and are essential parameters for evaluating brittleness and bursting liability. Understanding the significant factors that influence post-peak characteristics can offer valuable insights for the prevention of c...

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Bibliographic Details
Published in:International journal of coal science & technology 2024-12, Vol.11 (1), p.2-19, Article 2
Main Authors: Lu, Zhiguo, Ju, Wenjun, Gao, Fuqiang, Du, Taotao
Format: Article
Language:English
Subjects:
Analysis
Boreholes
Case studies
Coal
Coal burst prevention
Coal bursts
Coal mining
Energy
Excavation
Fossil Fuels (incl. Carbon Capture)
Fractures (Geology)
Geotechnical Engineering & Applied Earth Sciences
Liability (Law)
Load distribution
Mathematical models
Mechanical properties
Mineral industry
Mineral Resources
Mines and mineral resources
Mining industry
Numerical analysis
Post-peak behavior
Prevention
Synthetic rock mass
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Summary:The post-peak characteristics of coal serve as a direct reflection of its failure process and are essential parameters for evaluating brittleness and bursting liability. Understanding the significant factors that influence post-peak characteristics can offer valuable insights for the prevention of coal bursts. In this study, the Synthetic Rock Mass method is employed to establish a numerical model, and the factors affecting coal post-peak characteristics are analyzed from four perspectives: coal matrix mechanical parameters, structural weak surface properties, height-to-width ratio, and loading rate. The research identifies four significant influencing factors: deformation modulus, density of discrete fracture networks, height-to-width ratio, and loading rate. The response and sensitivity of post-peak characteristics to single-factor and multi-factor interactions are assessed. The result suggested that feasible prevention and control measures for coal bursts can be formulated through four approaches: weakening the mechanical properties of coal pillars, increasing the number of structural weak surfaces in coal pillars, reducing the width of coal pillars, and optimizing mining and excavation speed. The efficacy of measures aimed at weakening the mechanical properties of coal is successfully demonstrated through a case study on coal burst prevention using large-diameter borehole drilling.
ISSN:2095-8293
2198-7823
DOI:10.1007/s40789-023-00626-0