Mine filling is an important mining method, whose core lies in filling the goaf with filling material to support rock layers, control ground pressure activity, prevent surface subsidence, improve ore recovery rate, reduce mine safety risks, and minimize environmental pollution. The following is a detailed introduction about mine filling:

Filling purpose:

Support rock layers, control ground pressure activities in the mining area, and prevent safety accidents caused by rock instability.
Prevent surface subsidence, protect surface buildings and ecological environment.
Provide a working platform for continued upward mining to ensure the continuity of mining operations.
Improve the stress state of mining pillars to ensure maximum recovery of mineral resources.
For sulfide deposits with spontaneous combustion, filling can isolate the air and prevent fires from occurring.
Control rock burst phenomenon in deep well mining and reduce deep ground temperature.
Ensure production safety during joint open-pit and underground mining.
Filling material:

Traditional filling materials include waste rock, river sand, tailings, etc. These materials are relatively easy to obtain, but may have problems such as slow construction speed, high material consumption, or water resource waste.
New filling materials, such as mine filling cementing material, inorganic self foaming filling material, foam light soil, etc., have better performance, such as no segregation, no layering, small bleeding, short curing time, etc., and can effectively reduce the filling cost 2.
Filling technology:

The development trend of backfill mining method is to increase the layering height, develop segmented filling and stage filling to simplify the filling process and improve filling efficiency.
Using pipeline hydraulic transportation to transport high concentration filling materials can reduce transportation costs and improve filling quality.
Searching for new filling materials and researching new conveying processes to further enhance the economic and environmental benefits of filling technology.
Actual application and effectiveness:

The paste filling technology has become an inevitable requirement and effective way for the development and utilization of deep resources and the construction of green mines. For example, Huize Mining has effectively prevented and controlled the risk of stress disasters in deep well mining by using paste filling technology, improved the utilization rate of mining resources, and significantly improved the underground working environment.
The new type of mine filling cementitious material developed by Zhonggang Mining Institute has improved filling efficiency and achieved greener and safer mining. This innovation has explored a new path for the construction of green mines.
International standards and influence:

The world's first international standard for "mine tailings filling" led by China has been approved, marking a breakthrough in China's mining and filling industry, and enhancing China's influence and international standard discourse power in the international mining field.
In summary, as an important mining method, mine filling can not only effectively support rock layers and prevent surface subsidence, but also improve ore recovery rate, reduce mine safety risks, and reduce environmental pollution. With the continuous advancement of filling technology and materials, mine filling will play an increasingly important role in green mine construction and sustainable mining development.