Abstract
The optimization of a mining sequence not only reduces stress concentration in surrounding rock but also prevents underground debris flows, significantly improving safety. Firstly, the 870–898 m level of the eastern mining area in the Tiaoshuihe phosphate mine was divided into 25 ore blocks, and six different mining sequences were designed for this area. Then, it was calculated that five ore blocks must be processed simultaneously to reach the annual production output. The distances between the five simultaneously mined ore blocks will inevitably affect the efficiency of the equipment for any scheme. So, a collaborative model considering both the area stability and production capacity was established by combining the distance between the centers of the five ore blocks as an index. Differences in stability, deformation, and plastic zone size between the schemes are compared. The calculation results show that a mining scheme with a convex stepped shape produces the best results. These results provide a general method for entropy‐based mining sequence optimization and an optimal solution for the Tiaoshuihe phosphate mine.
Highlights
Filling mining is a popular contemporary technique that is increasingly advocated by many governments. Ground pressure in these types of mines will increase considerably as mining continues to deeper depths, so the corresponding requirements for ground pressure control will continue to expand [1, 2]
In 1963, Goodman and Brown put forward the concept of rock engineering excavation steps, which is described as the mining sequence [4]
The displacement, tensile stress, compressive stress, shear stress, and plastic zone results calculated for six schemes are shown below
Summary
Filling mining is a popular contemporary technique that is increasingly advocated by many governments. If measures are only taken after ground pressure triggers surrounding rock damage, production costs will increase and the production efficiency will be reduced. Liu successfully optimized the mining sequence of the Dongguashan deep well by considering the production capacity, stress, displacement, and plastic zone of the surrounding rock [6]. Based on the time-varying evolution of the mechanical parameters of a rock mass, Hu designed five mining sequence schemes in the deep section of the Gaofeng mine. The Tiaoshuihe phosphate mine is a gently inclined thin ore body with an average thickness of 3.22 m This mine contains a mining area of approximately 23.42 km and an estimated reserve of 200 million t [9, 10]. Optimization of the mining sequence in this area is necessary by considering regional stability and productivity objectives [12]
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