不同倾角下正断层下盘开采支承应力演化规律研究

Research on Evolution Laws of Abutment Pressure in Footwall Mining under Condition of Normal Foult with Different Dip Angles

以正断层下盘工作面开采为背景,采用三维有限差分数值模拟软件FLAC^(3D) ,建立不同断层倾角下盘工作面向断层推进的数值模型。研究了工作面支承应力的分布特征和演化规律。研究表明:下盘工作面向正断层推进过程中,由于正断层切割了顶、底板岩层的连续性,采动应力的阻隔效应显著,断层倾角越小,其阻隔效应越显著。

Taking the footwall mining under the condition of a normal fault as an engineering background,and using 3D finite difference numerical simulation software FLAC3D,established numerical model forfault advancing of footwall with different dip angles. Researching distribution characteristics and evolutionlaws of abutment pressure in the process of working face. The results show that the continuity of roofand floor strata is cut by the fault zone and significant barrier effect on mining stress is shown ,in theprocess of working face heading to the normal fault. The smaller the dip,the more significanct thebarrier effect.