One of the most challenging safety problems is ground instability during crossing overlying remnant pillars (CORP). Ground instability not only causes injury to miners or fatalities, but also leads to interruptions in the mining operations and breakdowns in equipment. In this paper, 12 major parameters influencing the ground instability were firstly determined based on extensive international experience associated with CORP. The consequences of the ground instability were then assessed in terms of miners' health and financial losses. Afterwards, a practical method to assess the ground instability risk of lower-seam longwall panels during CORP was developed based on its probability and consequence. Finally, this method was successfully used to determine the best scheme for CORP of LW10-103 at Mugua coal mine. The main advantage of this method is that it enables mining engineers to easily use international experience for assessing the risk of ground instability and selecting reasonable supports during CORP.

最具挑战性的安全问题之一是，越过上方的残余支柱（CORP）时地面不稳定。地面不稳定不仅会导致矿工受伤或死亡，还会导致采矿作业中断和设备故障。在本文中，首先根据与CORP相关的广泛国际经验确定了影响地面不稳定的12个主要参数。然后，根据矿工的健康和经济损失评估了地面不稳定的后果。随后，根据其可能性和结果，开发了一种评估下缝长壁板地面不稳定性风险的实用方法。最后，该方法成功地用于确定穆瓜煤矿LW10-103的CORP最佳方案。