The practical observation research on loose medium flow field theory on the top-coal caving
WANG Jia-chen
YANG Jian-li
LIU Hao-hao
ZHAO Da-peng
ZHENG Li-yong
Abstract：The special top-coal tracking system used for surveying the top-coal movement and running in the coal face was developed.The simulation experiment on the rule of top-coal running was done in laboratory.The recovery ratio and movement trace of the top-coal in the different layers were researched in detail by means of marking grains in the top-coal.The experiment result shows that the recovery ratio of the lower layer top-coal which is closed to the support is smaller due to drawing support,and the ratio of higher layer top-coal near the roof is smaller than the others because of gangue fleeing.The movement trace curvilinear equations of the different layers of the top-coal were obtained by means of the regression analysis according to the coordinate change of the top-coal grain.The top-coal grain movement may be divided into three stages:firstly,it moves back-down along the quadratic curve trace;secondly,it drops vertically;at last it moves to the running coal door along the quadratic or cubic curve trace.
Keywords：rule of top-coal movementmedium flow field theorytop-coal movement tracerecovery ratiograin tracetop-coal caving
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 353-356 )