Prevention of rockburst in staggered triangular coal pillars beyond the open-off cut
CAO Anye
XUE Chengchun
LI Songhui
JIA Liangliang
REN Zhixin
Abstract：In response to the frequent seismic events in the triangular coal pillar area,influenced by the out-board layout of longwall LW7618,significant faults,and the nearby goaf,this study employed numerical model-ing,analytical analysis,and field testing to examine the stress distribution characteristics of the surrounding rock during mining.A reinforcement and pressure-relief scheme was developed to prevent coal bursts in this area.The results show that the stress distribution of the surrounding rock in the triangular coal pillar area was analyzed during the"square" period of the longwall and the entry phase of the adjacent goaf,revealing that the maximum advanced abutment pressure increased by 28.3％and 37.3％,respectively.Seismic wave CT inver-sion results indicated that as the scale of mining expanded,the"island effect" in the triangular coal pillar area intensified,with the maximum velocity anomaly(An)increasing by 52％,and the extent of burst-risk regions in the longwall expanding by 53.3％.A reinforcement and pressure-relief scheme,including controlled roof- cutting blasting and coal blasting pressure relief,was implemented to reduce the stress levels of the coal-rock mass in the triangular coal pillar area,thereby effectively preventing coal bursts during mining in this zone.
Keywords：rock bursttriangular coal pillarroof blastingstress evolution
Publication Date：2026-02-28
Online Publishing Date：2026-03-12(First online date of this platform, not the publication date of the document)
Pages：9( 117-125 )