The position and state of the main roof above the terminal line of the coalface nearby the rises affect the magnitude of the peak abutment pressure and the difficult extent of the rise maintenance.

• 上山附近终采线上方老顶岩层的位态影响着煤柱支承压力的大小和上山维护的难易程度。因此,工作面终采线的位置,应尽可能确定在老顶岩层周期来压完成之后。