Deep Coal Mining Overburden Rock Movement Of The Stage And Multivariate Hazard Coupling Mechanism

With shallow coal resources increasingly depleted, the deep coal mining has become an important means of the new era of China’s energy security.According to statistics,China’s current proven reserves of coal at depths of more than a kilometer there is 2.95 trillion tons.Now occupy more than 53% of the total proven reserves.But with the increasing depth of coal mining, mechanical properties of rock mass has gradually changed.Not only roof management more difficult, rock burst may occur are also increasing, which makes coal mining may suffer increasingly dynamic disasters.To stress prevention-oriented rock burst become a key part of preventing deep coal mining.After entering the deep mining, mine decided to show the extent of the movement of rock pressure in the thickness direction and levels beyond the scope of traditional print model, the spatial structure of overlying strata movement formed by the impact of the distribution of the stress field of mining. This paper focus on the complex conditions of the deep mining of coal rock Disaster risk prediction mechanism and evaluation methods of mining. For both sides of the boundary conditions for the mined-out area and three Gob(island face) stope movement regularity, mechanical model of the spatial structure of overlying strata movement with mining coupled stress during stress mutation. By mechanical calculations, numerical simulation analysis, reveal deep mining coal cover rock mining stage multivariate coupling mechanism disaster. First, from a macro perspective, the impact of risk through the impact on the working surface geological conditions and mining factors.Determine the area might face in shock pressure occurred in advancing the process.Then using multivariate methods coupled Formation Mechanism, through the working surface structure, geological structure, motion and other strata spatial structure of coal and rock factor analysis, a separate analysis of each factor, draw the danger zone, the last of these dangers overlay area.Multivariate coupling delineate the extent of the different risk areas.With engineering examples, the use of micro-seismic monitoring results and the results of the mechanical stress field verification stage mining temporal distribution and multivariate hazard coupling mechanism.