A groundbreaking study reveals how strain rate influences anthracite crack characteristic Sstress under dynamic loading, offering a predictive model to assess crack stress thresholds. This research provides critical insights into damage evolution mechanisms, advancing strategies to predict and mitigate catastrophic events like rock bursts in underground mining.

Coal-rock dynamic disasters caused by dynamic disturbance pose a serious threat to coal mine safety and infrastructure. In this paper, the dynamic compression test of coal is carried out around the core scientific problem of underground dynamic disaster induced by dynamic load. The variation law of crack characteristic stress in the process of coal dynamic failure is systematically analyzed, and the strain rate effect of crack characteristic stress is revealed. Based on the logistic function model, a crack characteristic stress prediction model considering strain rate effect is established. Combined with the damage evolution and meso-failure characteristics, the influence of strain rate on the dynamic failure mechanism of coal is discussed from the perspective of energy.

Key findings include:

1. Based on the axial plastic strain method and axial strain stiffness method, the variation law of coal crack characteristic stress in the dynamic failure process is analyzed, and the strain rate effect of crack characteristic stress is revealed.

2. Based on the logistic function model, the stress prediction model of anthracite crack characteristics considering the strain rate effect is established.

3. Combined with the damage evolution and meso-failure characteristics, the influence of strain rate on the coal dynamic failure mechanism is discussed from the perspective of energy.

Supported by the National Natural Science Foundation of China, this research paves the way for safer, more efficient mineral extraction by elucidating the dynamic failure processes of coal. The findings are particularly relevant for deep mining operations, where high-stress concentrations and frequent dynamic disturbances increase rock burst risks.

The work entitled “Stress analysis of crack characteristic of anthracite under dynamic loading” was published on Deep Underground Science and Engineering (published on Feb. 11, 2025).

DOI：https://doi.org/10.1002/dug2.12147