DOI: 10.11799/ce202501016
Fracture movement law of nearly vertical extra-thick coal seam
LIU Xudong
QIAO Hao
FANG Xianwei
ZHU Hongwei
Abstract：In order to study the law of rock burst disasters of steeply inclined extra-thick coal seams,we established a mechanical model to study the law of fracture and movement of the overburden on nearly vertical coal seams in terms of theoretical analyses and on-site observations and tests.The results show that the rock stratum fracture mainly occurs in the immediate roof during the nearly vertical coal seams mining.As the working face mining keeps approaching,the roof stratum first appear to be torn off,accordingly will be fractured and collapse under gravity.Rocks near the roof stratum of the working face are inclined to collapse,and that near the floor of the working face are mostly slid.Rocks from the middle of the goaf are mostly falling down and overturned.On-site observation indicates rock separation and fracture are due to working face mining and roof-floor effect.The immediate roof will move violently attributed to the face mining,while the main roof is more stable.We furthered the study on the collapse of the roof-floor rock layers in nearly vertical coal seams,and provided a reference for forecast and control of the disasters,which were caused by coal and rock fracture and movement during fully-mechanized top-coal caving mining.
Keywords：nearly vertical and extra thick coal seamrock formation movementrock formation fracturesimilar simulationsdrill hole peeping
Publication Date：2025-01-19
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 113-119 )