Stopes at the third mid-piece and above of Hongling Lead-Zinc Mine have been mined out, leaving number of goafs of high risk without management. In order to ensure the safety of subsequent mining activities, stability of the mined-out areas has been analyzed in three steps. First, spatial geometric parameters of the structural planes is gained with the advanced photogrammetry, and the preliminary
... [Show full abstract] stability evaluation of rock mass from the point of engineering geologic (BQ, RMR) was conducted. Second, the discrete crack network model of structural surface was built to analyze the degree of crushing in surrounding rock from the point of numerical simulation. Third, the stability of the upper surrounding rock was studied from the point of engineering experience based on Mathews stability method. Combining regular geological method with numerical simulation and engineering experience, the research multi-angle layer-layer progressive, this method obtained the accurate and comprehensive analysis results of continuous mined-out zones stability, as well as the corresponding stability and damage area in surrounding rock with different properties. The research result has significant guidance value to safe mining. © 2017, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.