Longwall top coal caving method

1. Longwall Top Coal Caving
Method
Anil Kilania
anil.kilania.min10@iitbhu.ac.in

2. Contents
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What is an LTCC method?
Problems with thick seam mining.
Mechanism .
Advantages.
Case study.
Conclusion.

3. LTCC
• Longwall Top coal Caving (LTCC) is a
method of extraction for underground
mining of thick seams.
• It uses a longwall set-up and natural
forces to aid in the winning of coal.

4. Problems Associated With Thick Seam
Extraction
• Underground Coal loss.
• Heavy cost of supporting working places in
productive faces.
• Spontaneous combustion.
• Difficult strata control.

5. Geotechnical issues for LTCC
• Coal seam cavability / fragmentation
• Effect of massive strata units
• Effect of high horizontal stress ratios.

6. LTCC Face Assembly

7. Stress distribution

8. LTCC with slicing

9. LTCC with vibrator
The vibrator destroys the arch structure
formed during the top coal caving process,
which results in the smooth top coal caving
process, and in this way the top coal recovery
ratio is increased.

10. LTCC with vibrator
Support
Yield beam
Vibration device

12. Advantages of LTCC
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High resource recovery .
Operating cost reduction.
High productivity.
Mine financial performance.
Safety.

13. Conclusion
• If the site conditions are feasible for LTCC…..
…..You will always have more production.