Abstract
In the process of longwall top coal caving, the selection of the top coal caving interval along the advancing direction of the working face has an important effect on the top coal recovery. To explore a realistic top coal caving interval of the longwall top coal caving working face, longwall top coal caving panel 8202 in the Tongxin Coal Mine is used as an example, and 30 numerical simulation models are established by using Continuum-based Distinct Element Method simulation software to study the top coal recovery with 4.0 m, 8.0 m, 12.0 m, 16.0 m, 20.0 m and 24.0 m top coal thicknesses and 0.8 m, 1.0 m, 1.2 m, 1.6 m and 2.4 m top coal caving intervals. The results show that with an increase in the top coal caving interval, the single top coal caving amount increases. The top coal recovery is the highest with a 0.8 m top coal caving interval when the thickness of the top coal is 4.0 m, and it is the highest with a 1.2 m top coal caving interval when the coal seam thickness is greater than 4.0 m. These results provide a reference for the selection of a realistic top coal caving interval in thick coal seam caving mining.
Highlights
In the process of longwall top coal caving, the selection of the top coal caving interval along the advancing direction of the working face has an important effect on the top coal recovery
Longwall top coal caving (LTCC) mining consists of two processes: shearer cutting in front of a hydraulic support and top coal caving behind a hydraulic support
The parameters of the top coal caving interval (TCCI) in the process of top coal caving behind a hydraulic support have an important impact on the top coal recovery[3,4]
Summary
The selection of the TCCI in the LTCC working face has a great influence on the top coal recovery. The top coal caving amounts recovered in the second and third steps are small, and there is no obvious discharge body shape. The top coal loss under the 0.8 m, 1.0 m and 1.2 m TCCIs is obviously less than that under the 1.6 m and 2.4 m TCCIs. Simulation of the top coal recovery of a 20.0 m thickness under different top coal caving intervals.
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