Abstract
Strip mining with subsequent filling is one of the main mining methods for gently inclined thin ore bodies. The production process of excavating alternate strips is beneficial to the safety of mining. Reasonable stope structural parameters are key to achieving safe and efficient mining. The Tiaoshuihe phosphate mine of Sanning Mining is taken as an example in this study. Based on precision finite element modeling and simulation, a reasonable width range and the interval value of the strip are determined. A reliable and efficient strip width is calculated by using the probability model of the improved Mathews stability graph method. The results show the following. Firstly, under the geological conditions and backfill environment of the Tiaoshuihe phosphate mine, the reasonable and safe strip width interval is 7–9 m. Secondly, the probabilities of open stope stability with strip widths of 7, 8, and 9 m are 88.55%, 86.76%, and 84.94%, respectively. The reasonable probabilities of stope stability with strip widths of 7 and 8 m are higher than 85%. Thirdly, combining this with the drilling equipment operation parameters, it is suggested that the best strip width is 7 m without increasing the strength of the backfill.
Highlights
At present, the filling mining method is becoming increasingly widely used
Guo et al [6] adopted the fuzzy comprehensive evaluation method to prove that the optimal stope structural parameter is 10 m × 10 m for safety and high-efficiency mine operation in Sanshandao Gold Mine
Taking the parameters of underground equipment into consideration, a reasonable strip width for the Tiaoshuihe phosphate mining was determined by comparing the stability probability
Summary
The filling mining method is becoming increasingly widely used. It is a safe and efficient method to apply strip mining with subsequent filling for gently inclined thin ore bodies [1]. e structural parameters of the stope are closely related to its productivity and recovery rate, as well as the stability of the goaf. Used Mathews stability graph method and an orthogonal numerical simulation to determine the limit exposure area of zinccopper ore body of Dachang Tongkeng Mine. Li and Li [5] applied the 3D-sigma numerical simulation method to analyze the surrounding rock stability in different stope structure parameters and designed the reasonable size of room and pillar for a phosphate mine. Guo et al [6] adopted the fuzzy comprehensive evaluation method to prove that the optimal stope structural parameter is 10 m × 10 m for safety and high-efficiency mine operation in Sanshandao Gold Mine. Taking the parameters of underground equipment into consideration, a reasonable strip width for the Tiaoshuihe phosphate mining was determined by comparing the stability probability .
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