In order to design the key parameters for the roof cutting of the return air channel in the Shanbula coal mine working face reasonably,the methods of fracture mechanics and numerical simulation were used to study the action law of the key parameters for the roof cutting of the roadway.The main inspection indicators are the displacement of the top and bottom of the roadway,and the displacement of the left side of the roadway.Taking into account the width and height of the original excavation plan,the key parameters of the cutting seam,including the cutting seam height and angle,were simulated and tested to determine the influencing factors of the top cutting into the roadway.The optimal combination of influencing factors was obtained through experimental analysis,namely:cutting height of 6.5m and cutting angle of 10°.The numerical simulation was combined with downhole experiments,and the results were basically consistent.The optimal parameter combination effectively improves the pressure relief effect,reduces the deformation of the surrounding rock of the roadway,and ensures the safety of the retained roadway.
关键词
切顶卸压/沿空留巷/数值模拟/工业应用
Key words
top cutting pressure relief/leaving lanes along the goaf/numerical simulation/industrial applications
维普
万方数据