Research and engineering practice on mechanical reaming for pressure relief and rock burst prevention technology in hard coal seam roadways
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View abstract on PubMed
Summary
This summary is machine-generated.A new mechanical reaming technology improves coal seam pressure relief and rock burst prevention in hard coal seams. This method enhances pressure relief effects and significantly reduces roadway deformation and support stress.
Area Of Science
- Mining Engineering
- Geotechnical Engineering
- Rock Mechanics
Background
- Coal seam drilling is crucial for mitigating rock bursts but less effective in hard seams.
- Conventional methods can compromise roadway support integrity.
- Optimizing pressure relief drilling parameters is essential for safety and efficiency.
Purpose Of The Study
- Investigate the influence of coal seam strength and borehole diameter on pressure relief efficiency.
- Develop and trial a novel mechanical reaming technology for hard coal seams.
- Evaluate the performance of the new technology in pressure relief and support stability.
Main Methods
- Applied elastoplastic mechanics theory to analyze pressure relief.
- Developed and implemented a mechanical reaming technology for field trials.
- Utilized multiple monitoring techniques to assess pressure relief and support stability.
Main Results
- Higher coal seam strength reduces borehole pressure relief effectiveness.
- Increasing borehole diameter improves pressure relief, but with diminishing returns beyond 300 mm.
- The novel technology significantly increased drilling powder volume and enhanced pressure relief.
Conclusions
- A new 'support, deep pressure relief, unloading-support coupling' technology balances pressure relief and support.
- Mechanical reaming significantly improved pressure relief and reduced roadway convergence and support stress.
- Findings provide a foundation for rock burst prevention in hard coal seams.
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