Research On The Transformation And Optimization Of Ventilation Systems In Multi-section Mines Based On Large-scale Mining Layou

The ventilation system in mines is one of the key technologies for ensuring mine safety.It is particularly important to guarantee the stable operation of the mine ventilation system during the mining process.However,the mine ventilation system is a dynamic grey system that undergoes changes due to variations in the mining stages,depth of excavation,and location of mining faces.Therefore,in an operational mine,it is crucial to introduce disciplines such as mathematics,information science,computer theory models,and optimization design,simulation,and stability evaluation of the ventilation system.This study focuses on a mining site characterized by multiple mining stages and extensive mining layout.Through investigation and measurement of the current state of the mine ventilation system,combined with principles from mining engineering and the optimization theory of mine ventilation systems,the issues existing in the mine ventilation system were analyzed.These issues include problems related to contaminated airflow circulation,lengthy ventilation routes,and inadequate wind speed and volume in the tunnels,which do not meet the requirements for safe standardized operations.Based on these problems,the following research work was conducted:1.In order to solve the problems of large-scale mining layout in the three mining areas of the mine,large number of working faces,wide distribution,long front lines,and difficult control,etc.,a unitized extraction type transport road air intake and goaf return air scheme was proposed,and the conclusion was explored The unit ventilation method of "complex ventilation network unit simplification and unit control" was proposed,and the ventilation unit was established on the basis of 3 mining areas,and then the ventilation system was constructed on the basis of 3 units.2.Solution to the issue of contaminated airflow circulation: In conjunction with the partitioning ventilation planning,this study implemented strict sealing measures for the intermediate return airways and shafts between goaf areas and production areas.These measures created necessary conditions for achieving the desired dust and smoke exhaust effects in the ventilation system.3.In response to the existing issues in the mine ventilation system and production planning,four ventilation system renovation schemes were devised.The Ventsim software was employed to conduct simulation calculations for these schemes.Taking into account the current state of the mine ventilation system,a comprehensive analysis was carried out,considering the feasibility,economic viability,and reliability of each of the four schemes.Subsequently,the Rank-Sum Method was utilized to prioritize the four schemes,resulting in the identification of the optimal solution: Scheme 1,featuring a "four intakes and two returns" ventilation route with the eastern and central sections of the 2038 m level designated as return airways.4.Evaluation of the stability of the selected scheme using game theory and set pair analysis:To determine whether the selected optimal scheme meets the relevant safety standards for the mine ventilation system specified in the "Regulations for the Safety of Metal and Non-metal Mines(GB16423-2020)," a stability evaluation model based on game theory and set pair analysis was established.Scheme 1 was evaluated using the Technique for Order of Preference by Similarity to Ideal Solution(TOPSIS)and combination weighting methods.The evaluation results indicated an overall positive trend in the economic and technical effectiveness of Scheme 1,supporting its formal implementation.