DOI: 10.11799/ce201602001
Optimization study on drawing technique of longwall top-coal caving in extra-thick coal seam based on BBR system
WANG Jia-chen
CHEN Yi
ZHANG Jin-wang
Abstract：Reasonable drawing technique is a key factor to the drawing result of top-coal in extra-thick coal seam with LTCC method. Based on BBR system, the subsection drawing with large interval was proposed for the drawing method optimization in extra-thick top-coal; The formulas were presented for determining the reasonable drawing interval n, and the sensitivities of n on the thickness of broken top-coal, the thickness of broken immediate roof and the eccentricity of loose body were discussed; At last, the numerical simulation of the subsection drawing with large interval conducted by PFC was carried out to verify its applicability. The results show that, the top-coal recovery ratio is improved by 18?2%and 9?1% using subsection drawing with large interval, compared with sequence drawing and interval drawing.
Keywords：LTCCdrawing methoddrawing bodycoal-rock interfacerecovery ratio of top coal
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 1-4 )