Mechanism analysis of collapse-induced landslide and compound geological disaster in coal mining void area

Mechanism Analysis of Collapse-Slide Composite Geological Disasters Induced by Coal Mine Goaf Subsidence: Through numerical modeling and geological surveys, this study reveals the impact of coal seam mining on surrounding rock strata and the process of disaster formation. Coal mining significantly increases the maximum principal stress values in the slope and causes extensive stress concentration at the toe of the collapse slope, elevating the risk of slope instability. Meanwhile, differential deformation between the roof and floor of the goaf leads to layer separation, triggering progressive collapse. Tensile deformation and displacement at the rear edge of the slide mass indicate a close correlation between landslide formation and goaf subsidence. Using the FLAC ^3D computational model, the stress field, displacement characteristics, and plastic zone changes of the Dexing Mine collapse-slide mass were simulated. The study concludes that the Dexing Mine collapse-slide mass belongs to the "rear-edge impact loading composite" type, with its occurrence and development involving a long-term process.