不同结构面倾角及间距下煤柱变形分析

摘要

For problem that coal pillar is treated as a continuum in most of the coal pillar deformation studies without considering structural plane damage and instability in coal pillar,numerical simulation of the maximum principal stress and deformation of coal pillar under different inclinations and spaces of structural plane were carried out by use of 3DEC software.The results show that the maximum principal stress of coal pillar increases with increase of space of structural plane and decreases with increase of inclination of structural plane;influence of space of structural plane on the maximum principal stress of coal pillar decreases with increase of inclination of structural plane;coal pillar deformation decreases with increase of space of structural plane and increases with increase of inclination of structural plane;coal pillar deformation increases significantly when space of structural plane is less than 1.5 m and inclination of structural plane is more than 45°.%针对目前的煤柱变形研究大都将煤柱处理为连续体,没有考虑煤柱中广泛存在的结构面破坏及失稳问题,采用3DEC软件对不同结构面倾角及间距下煤柱最大主应力及变形量进行了数值模拟,结果表明:煤柱最大主应力随结构面间距增大而增大,随结构面倾角增大而减小;随着结构面倾角的增大,结构面间距对煤柱最大主应力的影响越来越小;煤柱变形量随结构面间距增大而逐渐减小,随结构面倾角增大而增大;当结构面间距小于1.5m,结构面倾角大于45°时,煤柱变形量显著增大.