Analysis of Weighting over Great Extent upon Fully Mechanized Coal Face with Non-Hard Roof Based on Measured Data

Abstract:

Due to the influence of geology, mining technology, supporting strength, fully mechanized coal face sometimes would happen large area caving and weighting over great extent, causing casualties. Theoretical and experimental analysis shows, not only hard roof could happen weighting over great extent, but softer roof upon long wall face could happen, the only difference was the location of disaster and the failure forms. The paper analyzed weighting over great extent upon fully mechanized coal face with non-hard roof based on measured data. The results show that, the important factors of support break-off were the setting load of hydraulic support, drawing speed of working face and support efficiency, and it would achieve support break-off warning help to analyze the open rates of safety valve.

• Periodical: Advanced Materials Research (Volumes 962-965)
• Pages: 992-997
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.962-965.992
• Online since: June 2014
• Authors: Tao Zhu
• Keywords: Large Area Caving, Roof Cutting, Roof Disaster, Setting Load, Support Break-Off, Weighting over Great Extent

References

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