Abstract
The exploitation and utilization of coal resources have caused serious ecological and environmental problems that are closely related to the movement and destruction of the overlying strata, especially the activities of the overlying key strata (KS). The existing KS calculation methods are characterized by low efficiency and high costs. This study proposes an object-oriented improved recursive algorithm (OORA) model to achieve efficient calculations for KS. An application program was developed and tested with the KS of the Xiadian coal mine, Shanxi, China. The calculation results were basically consistent with field observations, and the calculation depth was increased by 146.05 m. In addition, five typical KS calculation cases were selected for in-depth testing. The calculation time ranged from 0.175–0.225 s, and the calculation time was shortened by approximately three times compared to that with traditional methods. Therefore, it is feasible to apply the model algorithm for KS calculations, and the model provides benefits such as high efficiency and low costs.
Highlights
The mining industry, which is driven by human demand for mineral resources, is one of the main causes of current environmental pollution problems and poses a serious threat to the ecological environment system (Gu, 2018)
The results show that the calculation time of the program does not increase drastically as the calculation data capacity increases, indicating that the calculation efficiency of the program will not be significantly reduced due to the increase in the amount of data
The calculation of key strata is an important topic of strata movement control in coal mining
Summary
The mining industry, which is driven by human demand for mineral resources, is one of the main causes of current environmental pollution problems and poses a serious threat to the ecological environment system (Gu, 2018). A large number of valuable research results on strata control and surface subsidence prediction based on the KS have been obtained, which provides new ideas for solving environmental problems caused by mining (Cheng et al, 2017a; Cheng et al, 2017b; Cheng et al, 2018; Cheng et al, 2020). It is necessary to find a high-efficiency, low-cost, easy-tounderstand, and implementable method to realize do-it-yourself KS program calculations to meet the increasing research relying on key strata theory. In response to the above problems, we introduced an approach using object-oriented programming techniques and improved recursive algorithm strategies to achieve high-efficiency, low-cost, easy-to-understand, and practical methods to conduct key strata calculation.
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