Analysis and control of the stability of irregular coal pillars under the influence of mining activities
To assess the stability of three irregular coal pillars during mining in No.2305 face,theoretical calculations were first conducted to analyze the stability coefficients of these pillars.Subsequently,numerical simulation methods were employed to investigate the stress distribution characteristics and stability of the irregular coal pillars under the influence of mining activities.The research findings indicated that the stability coefficients of the three irregular coal pillars were 1.19,1.33,and 1.25 respectively,suggesting they could maintain stability after the mining face extraction.During the extraction process,the maximum stresses measured on these irregular coal pillars were 61.1 MPa,60.3 MPa,and 42.5 MPa respectively,with peak stress concentration factors of 3.76,3.71,and 2.62.As the mining face advanced,the stress distribution of the irregular coal pillars generally exhibited a saddle-shaped pattern,with evident elastic core zones.Based on comprehensive assessment,it was concluded that the irregular coal pillars could remain stable during mining face extraction,and corresponding control measures were formulated to prevent instability-induced impact disasters caused by mining activities.
irregular coal pillarscoal pillar stability coefficientelastic nuclear regionprevention and control of rock burst
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