Stress Disturbance Coefficient Method for Rock Burst Hazard Identification in Gully Regions: A Case Study

Gully topography significantly disturbs the in-situ stress field of underlying coal and rock masses, but the quantitative relationship between gully morphology and stress anomalies remains unclear. Taking the Kuangou Coal Mine as an example, this study combines numerical simulation and field validation to investigate stress distribution characteristics in a gully region. The results show that mountain height is positively correlated with vertical stress, while gully depth is negatively correlated. In contrast, gully width and angle mainly affect the horizontal stress distribution, and their influence decays rapidly with increasing burial depth. Based on these findings, a stress disturbance coefficient λ is proposed, and a rock burst hazard classification criterion using the D/H ratio (burial depth D to mountain height H) is established: D < 1.6H for high hazard, 1.6H ≤ D < 2.4H for medium, 2.4H ≤ D < 3.6H for low, and D ≥ 3.6H for no hazard. Field validation using 16 large-energy mine tremor events confirms the reliability of the proposed criterion. The method provides a quantitative basis for differentiated rock burst prevention in gully regions.