Principle of rockburst control by weakening static and dynamic loading using top-coal caving in the mining of thick coal seams
DOU Linming
LI Zhenlei
HE Xueqiu
Abstract：Rockburst is one of the characteristic coal-rock dynamic disasters.With the increasing mining intensity,the number of rockbursts occurring in thick coal seams is larger and the induced damage is severer.The control of rockburst occurring in thick coal seam mining is an urgent problem in need of solution.To solve this problem,a study was carried out by means of in situ investigation,theoretical analysis,numerical simulation,and engineering practice etc.The resluts show that top-coal caving mining can reduce the stress concentration around roadways and coalfaces.With increasing mining height,the dynamic disturbance in top-coal caving mining rises gradually and then suddenlly jumps to a high value,while the static stress concentration decreases rapidly and then reduces slowly to a stable value.Top-coal caving mining can reduce rockburst risk in a certain mining height range.Therefore,it is recommended that the top-coal caving method should be the preferred method of extraction when mining coal seams of a certain thickness.Static stress concentration is reduced by reasonably increasing the mining height,and dynamic disturbance is weakened by taking roof pre-splitting measures.Field practice in Xing'an and Junde mines reveals that top-coal caving mining reduces the range over which damage is likely to be suffered and also the severity and frequency of rockbursting when compared with slicing mining,which verified the rockburst-reducing effect of top-coal caving mining.
Keywords：rockburstthick coal seamfully mechanized top-coal caving miningdynamic disturbancestress concentration
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 221-230 )