Influencing Factors and Assessment of Coordinated Coal-Water Co-Mining in Ecologically Fragile Areas

Abstract

Mu Us Sandland is characterized by dry climate, shortage of water resources and fragile ecological environment, which is extremely sensitive to various human disturbances. However, since it is rich in coal resources, the exploitation of coal resources will inevitably increase the burden on the local environment, resulting in the deterioration of the ecological environment in the mining area. The purpose of this paper is to identify the main influencing factors and their importance of coal-water coordinated co-mining in Jinggong Coal Mine in Mu Us Sandland, and to provide reference for solving the contradiction between coal resources development and ecological environment protection in ecologically fragile areas. Firstly, a research method of influencing factors of coal-water coordinated co-mining based on the full life cycle theory is proposed, in which the coal mine development cycle is divided into three stages according to the disturbance degree of coal mining to the groundwater system and the ecological mutual feedback effect caused by it, combined with the ecological environment characteristics of the mining area, and on this basis, the influencing characteristics of each stage are summarized and a dynamic index database is established. Then, the dependence, feedback and dominance relations among indicators in each stage are distinguished, and cone-bottom elements and cone-top elements are divided. Next, based on Cone-ANP, an analysis model is constructed, and cone element sets in different stages are established, which are used to calculate the weight distribution of each influencing factor. The results show that the geological system in the planning and design stage has a great influence on the coal-water coordinated co-mining, the mining system in the construction and mining stage has become the main influencing factor, and the eco-environment system in the closing and renovating stage has the greatest impact on the co-mining, all of which provide a reference for the improvement of the comprehensive benefits of coordinated co-mining and the improvement of mining technology in the ecologically fragile mining areas in the west.