DOI: 10.11799/ce201710005
Top-coal failure process and its influencing factors in longwall top-coal caving mining
WANG Zhao-hui
XIE Fei
Abstract：According to the different conditions of top coal boundary, the top coal damage process is divided into two stages: the damage in front and at the rear of coal wall. Load characteristics of the top coal in the supporting area are analyzed, and the stress path history is obtained, which indicates that, the influence of lateral stress variation is more significant than vertical stress on the damage risk coefficient. Stability analysis model is established for the top coal in roof-control area at the rear of coal wall, damage coefficient distribution of the top and bottom top coal in the area under the roof rotation and repeated support are obtained. According to the influencing factors analysis, the top coal damage risk coefficient is positively related with mining depth, fracture development of coal seam, roof load and mining influence, and negatively related with coal seam strength and top coal thickness.
Keywords：top coalfailure mechanismtop coal damage factorslongwall top-coal caving mining
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 20-25,29 )