Abstract
To explore the structure evolution of overlying strata and pressure characteristics of coal mining with large dip angle, the basic roof mechanical model was established that based on the thin plate theory and the development characteristics of 1212 (3) working face of Panbei Mine. The formula was deduced that used for calculating the basic roof stress distribution in large dip angle coal seam. It revealed the mechanism evolution of mining stress and its influence on overburden deformation. Furthermore, it was also discussed that the effect of false roof on the failure of the basic roof. It showed that the false roof increases the differentiation of gangue’s filling rate in goaf and improves the evolution rate of basic roof fracture. It is the main influencing factor that the large dip angle leads to the “scoop” distribution of the stress and deformation in basic roof. It dominates the evolution of overburden fractures and the regional instability. The maximum deformation of the basic roof is located in the middle and upper part of the working face. This theoretical model is verified by means of numerical simulation and field monitoring.
Highlights
With the increasing demand for coal resources, the shallow coal resources are gradually exhausted
Without considering other influencing factors, the relationship between coal seam dip angle and basic roof deflection was analyzed by controlling variable method
When the coal seam inclination angle is greater than 60, the overburden pressure acting vertically on the roof decreases by half, and the basic roof flexural deformation tends to be flat
Summary
With the increasing demand for coal resources, the shallow coal resources are gradually exhausted. It becomes the main body of resource mining that including the complicated thin coal seam, edge coal seam and large dip angle coal seam (Wang et al, 2019; Xie et al, 2009). The thick and hard strata dominate the overlying strata movement, while thin strata plays the role of loading on goaf. It is the premise of coal mine safety that control well surrounding rock. It is of great significance to carry out the research on the roof deformation and fracture criterion of large dip coal seam for the selection of working face support and the control of surrounding rock
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