浅埋薄煤层钻采煤柱稳定性与破坏机理研究

Research on Coal Pillar Stability and Failure Mechanism of Thin Coal Auger Mining in Shallow Seam

对埋深50 m薄煤层采用螺旋钻开采的FLAC3D数值模拟,从采场和煤柱的应力分布、塑性区分布规律入手,探究了煤柱宽度尺寸改变时采场和煤柱的稳定性和破坏形式。研究表明:采场和煤柱受水平应力影响极小,主要为竖直方向应力且破坏形式主要为剪切破坏,煤柱内应力弹性核区随煤柱宽度减小而减小,弹性核区内应力峰值逐渐增大直到临界失稳时增幅不大,煤柱宽度尺寸对其稳定性影响很大。

For numerical simulation of FLAC3 Dauger mining burial depth of 50 meters using thin seam,from stress and coal pillar working faces distribution distribution of plastic zone start to explore the stability of coal pillar width dimensions change when working faces and coal pillar and failure modes. Studies have shown that:working faces and pillar of horizontal stress with minimal impact,mainly for the vertical direction stress and damage mainly in the form of shear failure; elastic stress within the nuclear area coal pillar decreases with coal pillar width decreases,elastic nuclear stress increases gradually until a peak in the region do not increase the critical buckling; coal pillar width dimension significant impact on coal pillar stability.