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Preventing water-inrush from floor in coal working face with paste-like backfill technology
Xingyue Qu1, Longqing Shi1, Jin Han2
1College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
Scientific Reports
|September 24, 2023
Summary
Paste filling technology effectively prevents water inrush from deep coal seam floors. This method reduces floor damage caused by mine ground pressure, safeguarding against economic losses.
Area of Science:
- Mining Engineering
- Geotechnical Engineering
- Hydrogeology
Background:
- Deep coal seam mining in Feicheng coal field faces significant economic losses due to water inrush from Ordovician limestone aquifers.
- The floor "lower four-zone" theory guides the understanding of strata behavior.
- Caozhuang Coalmine's 81006 working face serves as the study's practical context.
Purpose of the Study:
- To propose and evaluate paste filling technology as a method to prevent water inrush.
- To inhibit or reduce floor damage depth caused by mine ground pressure.
- To mitigate economic losses associated with deep coal seam mining.
Main Methods:
- Utilized paste filling technology with glue material, coal gangue powder, and fly ash.
- Established a comprehensive ground and underground filling system, including material production, storage, supply, control, monitoring, and delivery systems.
- Conducted field stress monitoring and floor damaged depth measurements.
Main Results:
- Paste filling working faces restored to the original stress state after reaching a steady state.
- Significantly reduced the floor's damaged depth caused by mine ground pressure.
- Demonstrated the effectiveness of paste filling in preventing water inrush.
Conclusions:
- Paste-like backfill technology is a highly effective measure for preventing water inrush from deep coal mine floors.
- The implemented paste filling system successfully managed goaf filling and reduced geological damage.
- This approach offers a viable solution to mitigate risks and economic losses in deep coal mining.
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