Determination and influence of cutting height of coal by top coal caving method with great mining height in extra thick coal seam
Abstract：In order to determine the cutting height of coal on top caving with great mining height, the influence of dif- ferent cutting height on the support working resistance, the top-coal caving rules and the coal wall stability were stud- ied based on theoretical analysis and numerical simulation method. The results show that the ratio of mining height to caving height, coal wall stability, mine pressure appeared, top coal recovery rate and equipment investment should be fully considered to determine the cutting height. The support requires strength, top coal recovery rate, coal wall spalling positively correlate with the cutting height, which is not a linear relation. Due to the influence of top coal geological conditions and recovery rate, the rate of coal wall spalling large mining height fully-mechanized in the condition of the in top coal caving with great mining height is larger than same cutting height. The top coal caving with great mining height is a breakthrough, and is a new effective way to achieve safe and efficient mining in extra thick coal seam.
Keywords：top coal caving with great mining heightcutting heighttop coal migration rulerate of recoverycoal wall spalling
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1777-1782 )