Scientific exploration of development and reutilization of vertical shafts in closed mines

Mine vertical shaft is the only way for underground mining. Concrete masonry engineering has the characteristics of high supporting intensity, large vertical space and long service life. The vertical shaft structure is more stable than the mining roadway structure and the goaf structure. It is more suitable for development and reuse as a special underground space. The whole life cycle of mine vertical shaft security service includes pre-harvest scientific design, security service in mining and post-harvest safety management, ecological protection and scientific utilization. It has the advantages of concealment, air defense and stability for the vertical shaft. Guided by the coordinated development of closed pit mine shaft development and reuse, new energy efficient energy storage and environmental protection, fully considering the scientific, possibility and feasibility of the accurate development and utilization of the vertical wellbore of the closed pit mine, four main scientific exploration contents for the development and reuse of shaft wells in closed pit mine were condensed. It contains the explorations and ideas of shaft wellbore storage power station based on gravity pumped storage and compressed air energy storage, the basic research and experimental exploration concept of deep well improvement reform with three technologies: fluid lifting technology, magnetic levitation lifting technology and fluidization lifting technology, the concept of a large scientific experiment with three types of tests: microgravity test, wind tunnel science test and projectile rocket test, and the exploration and ideas of renewable energy accumulation. The ultimate goal is ensuring the security service of vertical shaft. Vertical shaft risk identification and monitoring and early warning technology is the top priority. A closed pit shaft well recycling safety evaluation system is urgently needed to establish. The main control factors affecting the safety evaluation of closed pit shaft re-use are given. Finally, the exploration direction of the development and reuse of closed pit mine shaft is summarized. The thinking and exploration of the scientific re-use of shaft wells in closed pit mines is in line with the national life-cycle policy of scientific closed pits, comprehensive reuse of de-capacity resources and ecological beautification, and a national strategy for improving the precise development and utilization of closed pit mine resources. It has important economic and strategic implications.