Multidimensional analysis and research on the impact of goaf on the surface

In order to study and determine the safety impact of the unknown goaf on the surface of Dazhuohe Iron Mine, and to eliminate or control the harmful impact of the goaf. Based on the early mining data, geophysical prospecting and drilling, this paper basically determines the distribution, scale and occurrence relationship of unknown goafs. Theoretical calculation and numerical simulation methods are used to judge that the goaf has a certain safety impact on the surface, which may fall to the surface, and the surface has collapsed, so the goaf needs to be filled. During the construction of goaf treatment, it is found that the volume of filling grouting is much smaller than that of the explored goaf, and the main reasons are judged to include geophysical prospecting interference, goaf collapse, and the impact of fracture zone. Therefore, in order to further determine the impact of the goaf on the surface, the probability integral method is used to calculate and analyze the surface movement and deformation within the mining area. Finally, it is determined that the surface of the goaf in Dazhuohe Iron Mine is basically stable to stable state, and will not adversely affect the surface structures, facilities and equipment, then provide technical support and scientific basis for mine safety production.