Distribution Characteristics and Genetic Mechanism of Goaf in Xinghe Iron Mine, Ji’nan

There are about 100 km2 iron mine goafs in Ji'nan area. Due to the urban expansion and human-made mining activities, there are some problems in the utilization of such engineering construction site. In this article, the goaf in Xinghe iron mine in Ji'nan is taken as the study object. By means of geological investigation and exploration, the stratigraphic structure and metallogenic structure of the area are found out. The iron deposits are mainly embedded in the middle and lower strata in vein type. There are two “goaf bodies” in the area, which caused 16 ground fissures, collapse pits, ground subsidence and other phenomena in the surrounding area. The failure mechanism of the goaf in this iron mine can be summarized as “overburden bending surface cracking” mode. The overburden in the goaf has overall bending deformation, develops upward, expands to the loose layer on the surface, and cracks due to tension. This study has a certain practical value for the rational utilization of the site, reinforcement and prevention.