次生断层影响下底板断层保护煤柱留设数值模拟研究

Numerical Simulation on the Protective Coal Pillars for the Floor Fault Under the Influence of Subfault

为了解决次生断层影响下断层保护煤柱留设的问题,运用数值模拟软件FLAC3D对不同倾角和主、次断层间距情况下断层保护煤柱留设宽度进行模拟分析,得出不同条件下的断层保护煤柱宽度留设。研究结果表明,主断层附近存在底板次生断层的情况下,底板连续性较差,在采动影响下底板易发生破坏,底板破坏区域容易和主断层连通,需留设较宽的保护煤柱;在断层倾角一定的情况下,在某一主、次断层间距内,次生断层对断层保护煤柱留设有较大影响,超出此距离后,次生断层对断层保护煤柱留设宽度影响较小,断层倾角越大,此距离越小。

In order to resolve the problems of protective coal pillars for the fault under the influence of subfault,the widths of coal pillars for the fault with different dip angles and spacings were simulated and obtained by FLAC3D software.The research results showed that if the subfault in the floor existed near the main fault,the continuity of floor was poor.Thus,the floor would be easily damaged by the mining effect,and the destruction area of floor would be easily connected with the main fault.Consequently,the wide pillars were required.Under the situation of the certain fault dip,the subfault had a strong influence on the fault coal pillar in a certain distance between main fault and subfault,but the influence would be decreased beyond this distance.And the smaller the Fault dip was,the greater the distance was.