Optimization of Stope Structural Parameters Based on Mathews Stability Graph Probability Model

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.

Key Blasting Parameters for Deep‐Hole Excavation in an Underground Tunnel of Phosphorite Mine

“…In view of the construction of mines and tunnels under different geological conditions, many scholars have carried out a lot of research on the blasting of the trench and discussed the influence of cutting mode, cutting parameters, cutting diameter, and charging mode on blasting effect [1][2][3][4][5][6]. Shan et al [7] proposed that the main cut and the working face have an angle, while the auxiliary cut was perpendicular to the free face.…”

Optimization of stope structure parameters by combining Mathews stability chart method with numerical analysis in Halazi iron mine

“…Considering only the stability coefficient, for the Halazi Iron Mine 2nd Deposit, the Rock Mass Rating (RMR) is 47, and the structural parameter value Q ′ is assumed to be 1.40. The parameters for coefficients A, B, and C can be referenced from the literature [ 25 ], which will not be specifically mentioned here. Based on calculations, the value of coefficient A for the Halazi Iron Mine 2nd Deposit is 0.85, the value of coefficient B is 0.3, and the value of coefficient C can be taken as 1.00.…”

Collaborative Mining Sequence Optimization for Multiple Stopes under Intensive Mining

“…e fractures in the 870-898 m level of the eastern mining area are relatively developed, and the mining sequence is related to the overall stability and mining safety of the area [9]. According to geological occurrence conditions, a three-dimensional ore body model was established, and 25 numbered mining areas were identified.…”

“…e Tiaoshuihe phosphate mine is a gently inclined thin ore body with an average thickness of 3.22 m. is mine contains a mining area of approximately 23.42 km 2 and an estimated reserve of 200 million t [9,10]. To realize production, it is necessary to plan intensive mining, adjust the mining areas of simultaneous production in one location, and then maximize the utilization rate of personnel and equipment [11].…”