本文是以西石门铁矿南区采空区为研究对象 ,依据矿岩的点荷载强度测定与结构面调查 ,对岩体稳定性进行分级。指出南区采空区顶板冒落形式 ,一是以散体形式零星冒落 ,另一是批量冒落。通过对南区地表塌陷坑周围裂纹扩展与井下揭露岩体的观察 ,进一步研究分析采空区的冒落规律。 This article is based on the study area of ​​the gob area in the south of Shimen Iron Mine. According to the point load strength measurement and structural plane survey of ore rock, the stability of the rock mass is graded. Pointed out that the roof of the mined area in the southern part of the form of the fall, first scattered in the form of sporadic fall, the other is the bulk of the fall. Through the crack propagation around the surface subsidence pits in the southern area and the observation of the underground exposed rock mass, the law of the gob of the goaf is further studied and analyzed.