地堑状断层组影响下采动主应力偏转规律研究

Research on the Law of the Principal Stress Deflection for the Underground Coal Mining with the Graben Fault

为研究地堑状断层组影响下采动诱发应力场偏转规律,以淮南矿区刘庄煤矿地堑状F19断层组为研究对象,模拟分析了地堑状断层组附近采动主应力方向偏转情况,研究了主应力方向与断层面剪应力及剪应力增量的分布规律。研究表明工作面回采时采场围岩内的主应力方向发生偏转,偏转方向趋向垂直断层面;断层面内主应力与断层上盘、下盘主应力偏转相比,断层面内主应力方向偏转角度相对较大,最大偏转角度达到27°25′35″;当主应力方向与断层面交角在45°左右时,断层所受的剪应力增量最小,剪应力相对较大;地堑状F19断层组附近主应力偏转方向趋向垂直断层面,断层面所受剪应力和剪应力增量逐渐减少。

In order to research the law of the principal stress deflection for the underground coal mining with the graben fault,taking the graben fault group in Liuzhuang Coal Mine of Huainan mining area as the research object,through numerical simulation,the principal stress deflection for the underground coal mining with the graben fault was analysed,exploring the relationship between the principal stress direction and shear stress and the shear stress increment of the fault plane.The results show that the principal stress deflection was induced by mining activities,compared with the principal stress of the upper and lower plates of graben fault group,the principal stress in the fault plane was relatively large,with the maximum deflection angle being 27°25′35″;when the principal stress direction and the fault plane were at an angle of about 45 degree,the shear stress was relatively large and the increment of the shear stress was relatively minimal,the direction of principal stress deflection near the graben fault group F19 tended to be perpendicular to the fault plane,the shear stress and the increment of shear stress on the fault plane were gradually reduced.