Abstract: In order to eliminate the great potential safety hazard that the goaf of iron mine brought to the iron mine workers and production,the accurate detection method of the goaf in a iron mine is studied.Based on anlyzing the working principle of the goaf detection by adopting the high density resistivity method,the goaf detection model is established,the identification characteristics of high resistivity anomalies and resistivity mutation of the goaf that is shown on the resistivity profile.Taking the goaf of a large iron mine of Wutai-Luliang region as an example,the accurate detection method of the goaf in a iron mine is studied.The distribution range of the goaf anomalies is delineated based on the goaf identification marks,the goaf is shown in the detection results figures obviously,the resistivity anomaly characteristics is consistent with interpretation marks,the drilling verification results show that the goaf can be identified effectively by adopting the high density resistivity method.Based on the three-dimensional laser scanning results of the goaf,three-dimensional model of the goaf is established,the spatial characteristics informatin of goaf is obtained accurately.The above study results show that the goaf of iron mine can be detected efficiently,economically and accurately by using the comprehensive detection method of adopting high density resistivity method to delineate anomalies,drilling verification and three-dimensional laser scanning modeling.

Key words: Goaf, Accurate detection, High density resistively method, Three-dimensional laser scanning, Detection model of goaf