带压开采下煤层底板破坏特征的数值模拟研究

 运用数值模拟软件模拟带压开采下煤层底板的破坏特征。根据矿区实地数据资料结合流固耦合原理，对不同推进距离、不同水压、不同隔水层厚度下的底板破坏特征进行模拟。结果表明，在模拟推进过程中，水压的增大、隔水层厚度的减小导致底板位移增大、围岩应力集中明显,在导水带附近影响尤甚，真实的反映了带水压开采底板破坏特征；初次位移、应力增大的推进距离与初次来压的推进距离相吻合。可见数值模拟对于带压开采模拟分析以及预测初次来压是可行的，研究结论可为煤层开采过程中的流固耦合分析以及底板突水机理研究提供参考。

NUMERICAL SIMULATION RESEARCH OF FAILURE FEATURE OF SEAM FLOOR ON COAL MINING UNDER WATER PRESSURE

AbstractFailure feature of seam floor is analyzed with numerical simulation software. According to actural data information and theory of fluid-solid coupling ,the feature is sumulatied under different advancing distance,different water pressure and different confining stratum thickness, and some conclusions are obtained.During exploring procedure, water pressure makes seam displacement increase and surrounding rock stress evidently concentrate especially near to water conducted zone,and the result truly reflects the failure feature of seam floor under water pressure .The advancing distance of the first increased displacement and stress just matches up to the advancing distance of firstweight . It is practicable that numerical simulation can simulate and analyse mining under water pressure and predict firstweight. the conclusion can be referred in fluid-solid coupling analysis of coal-mining and the mechanics of water inrush from seam floor.