Abstract
In order to solve the current two major environmental problems of urban waste pollution and surface subsidence above the coal mine goaf, the technology of sealing and backfilling the goaf with urban waste is proposed. This technology takes "waste disposal" and "goaf backfilling" as the theme. Aiming at the processing of loose waste, the waste drying and briquetting integrated machine is designed, the entire processing technology ensures the strength of the loose waste materials and no filtrate. For the processing of solid aggregate waste, it is crushed into recycled concrete raw materials for goaf backfilling. Aiming at the goaf backfilling, the goaf backfilling coal mining method is designed, the backfilling hydraulic support is modified, and the backfilling mechanism is added to realize the integration of “mining-backfilling” in the working face. The backfilling technology embodies the key issues of the sealing of the backfilling space and the strength of the backfilling body with "three times of sealing" and "three times of strengthening". Using urban waste as the backfilling materials for the goal area, the waste pollution and the surface subsidence are turned into “two benefits”, and the construction of waste-free cities and green mines is promoted.
Highlights
China is a big coal mining country
After large-scale underground coal mining, if the traditional caving management roof continues to be adopted, it will inevitably lead to large-scale surface subsidence and large-scale landslides and other geological disasters, which greatly affects the integrity of the ecological environment of the entire region (Xu et al 2020; Tan et al 2020; Yang et al 2021)
There are 4716 geological disasters caused by mining in nationwide, including 1,887 goafs subsidence, accounting for 40.01% of the total mine geological disasters
Summary
China is a big coal mining country. After large-scale underground coal mining, if the traditional caving management roof continues to be adopted, it will inevitably lead to large-scale surface subsidence and large-scale landslides and other geological disasters, which greatly affects the integrity of the ecological environment of the entire region (Xu et al 2020; Tan et al 2020; Yang et al 2021). Based on the above research status, in the face of these two major environmental problems, many results have been achieved in the study of coal mine backfilling mining and waste disposal, there are many economic and environmental problems in the actual application. This technology proposes to combine urban waste disposal and mine goaf management, that is, to use urban waste as a backfilling material to close the coal mine goaf to form a systematic project. On the basis of effective control of surface subsidence, the pollution-free disposal of urban waste is of great significance to promoting the sustainable development of the urban economic environment and the construction of green mines in my country
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