Overburden failure induced by instability of coal pillar in strip Wongawilli mining
TAN Yi
GUO Wen-bing
BAI Er-hu
YANG Da-ming
XU Guo-sheng
YAN Hao
Abstract：In order to study the failure mechanism and movement characteristics of overburden induced by coal pillar instability,the first continuously-extraction area of No.15 coal seam in Zhaowu Mine was taken as a geological model,and theoretical analysis,similar simulation,site measurement and formula calculation were combined to build a systematic model in strip Wongawilli mining,and the coal pillar instability and its effect on overburden failure were analyzed.The results show that in the pillar system of strip Wongawilli mining,some damaged or irregular pillars would become instable under the coupling effect of mining pressure,ground water immersion and other unfavorable factors,correspondingly,relevant pillars would be affected and become instable.Therefore," Domino effect" occurred and the whole pillar system invalidated.Overburden failure was aggravated by pillars instability,the mining condition transformed insufficient mining stage to sufficient mining stage,which resulted in surface subsidence.
Keywords：strip Wongawilli miningcoal pillar instabilityoverburden failureDomino effect
Publication Date：2017-01-01
Pages：7( 1656-1662 )