基于FLAC-3D的成庄矿多煤层陷落柱防水煤柱留设研究

Research on retaining waterproof pillar of collapse column in multiple colm seam of Chengzhuang Coalmine by the numerical simulation of FLAC3D

运用FLAC-3D模拟软件对成庄矿内贯穿3^#、9^#、15^#煤层的KDX74、JDX75、KDX76陷落柱的防水煤柱预留情况进行数值模拟。通过分别留设不同宽度的防水煤柱进行模拟实验发现,当3^#煤层防水煤柱留设20 m,9^#煤层防水煤柱留设30 m,开采15^#煤层时,当15^#煤防水煤柱为20 m时,3^#煤层采空区下方塑性破坏区域与陷落柱活化区域导通,表明15^#煤层的开采可能导致3^#煤层采空区底板突水,故15^#煤防水煤柱宽度不应小于30 m。

Research on retaining waterproof pillar of collapse column KDX74,JDX75 ,KDX76 running through 3# ,9# ,15# seam of Chengzhuang Coalmine were studied by using numerical simulation of FLAC -3D. By retaining different width of waterproof coal pillar in the simulation experiments, we found that the plastic yield areas and Collapse column activated region connected under the mined - out area of 3# seam when 15＇ seam waterproof coal pillar reserved 20 meters in mining 15＇ coal seam ,3# seam waterproof coal pillar reserved 20 meters and 9# seam waterproof coal pillar reserved 30 meters, it means that the mining of 15# seam will lead to water lnrush from the mined -out area floor of 3# seam,so the width of waterproof coal pillar of 15# coal seam shoud be reserved more then 30 meters.