Study On Annual Output Optimization And Match Mode Of Combined Mining Technology System In Surface Coal Mines

The number of mining pits and mining technology systems under large scale mining adopted in surface mining areas have become the key issue in China's rapid expansion of surface coal mines. This paper has put forward theoretical foundations for large-scale mining of surface mines.Based on the principle of mineral reserves, production technology and the optimal economics, the paper has established the models of annual production optimization for single and multiple pits mining by comprehensive use of surface mining theory, reliability and technology economics, field investigation and study, theory analysis and engineering practice.After analyzing influence factors of mining technology system selection, applicable conditions and spatial distribution of single mining technology system, key mining technology system and other mining technology systems, the paper has classified the combined mining technology systems, and summarized the characteristics and applicable conditions of various combined mining technology systems. Based on fuzzy mathematics and hierarchical analysis, the paper has established comprehensive evaluation model of mining technology system selection, and put forward the approach to determine the mining parameters of combined mining technology systems, and the productivity matching principles and parameters of each single mining technology system in combined mining technology systems of surface coal mines.Based on the productivity matching principles of each single mining technology system, the paper has put forward the dynamical adjustment method of combined mining system. According to the relationship among each single mining method, the paper has plotted the typical relationship figure, and established the reliability models of combined mining technology system and the approach to improve the reliability of mines with combined mining technology system.According to the analysis of basic characteristics of surface mine development haulage systems and influential factors of mutual interference among each single mining technology systems, the paper has optimized the development haulage system under combined mining technology system. After analyzing the factors in the position arrangement of crusher station, the model optimizing the position arrangement of crusher station has been established under combined mining technology system. Based on the principle of least total transportation costs, the paper has established the model by using numerical iterative and found out the optimal layout depth of crusher station.In the process of the multiple pits mining in surface coal mines, it is important to optimize the height of burying slope, the shift step of the built bridge on end-slope and the recovery height of triangle coal. The paper has established mathematical models to optimize the height of the inner-dumping with burying slope, the shift step of the built bridge on end-slope and the recovery height of triangle coal. The optimal height of the inner-dumping with burying slope, optimal shift step of the built bridge on end-slope and the method to shorten waste transportation distance under different height of burying slope have been obtained. The paper has also established the geometry model and calculation method for the triangle coal recovery.Take Antaibao Surface Coal Mine, Baiyinhua Surface Coal Mine and Heidaigou Surface Coal Mine as examples for case study, this dissertation verifies the correctness and effectiveness of the research topic, research methodology and research results, which is significant for enrichment and development of surface mining theories and practical application.There are 30 figures, 9 tables and 161 references.