Stability of Coal Walls in Working Face Based on Wedge-shaped Vertebral Model
Aiming at the poor stability of coal walls during mining in complex geological condi-tions in the Datong mining area,the influencing factors of coal wall stability were studied through theoretical research and numerical simulation,taking No.1022 working face of one mine as the engineering background.The results show that during the mining,the coal wall spalling instabil-ity process could be divided into the coal body damage stage and the coal wall shear-slip instability stage.In the coal body damage stage,the stress environment of coal body in front of the working face deteriorated,which aggravated the damage of the coal rock unit in the stress distortion areas and increased the chance of coal wall spalling;in the coal wall shear-slip instability stage,accord-ing to the wedge-shaped vertebral mechanics model,it is found that the stability coefficient K in-creased with the increase of the support protective force P0,structural surface cohesion C,and internal friction angle φ;it decreased with the increase of roof pressure.Based on this,we pro-posed some control measures for coal wall stability.
万方数据
维普
