Entry stability monitoring and analysis for longwall and continuous mining systems
- Cyprus Amax Coal Co., Englewood, CA (United States)
- Cyprus Amax Coal Co., Waynesburg, PA (United States). Pennsylvania Services Corp.
- West Virginia Univ., Morgantown, WV (United States). Dept. of Mining Engineering
Under a specific geological condition, roof supporting method, and pillar-entry system, an entry convergence concept may be the most effective means that can be used to effectively indicate the longwall entry stability (i.e. pillar bumps, roof falls, or floor heave). This concept may also be used to verify the effectiveness of the current pillar-entry system and roof supporting method. Furthermore, convergence measured under different mining phases may lead to a better understanding of the longwall mining-induced abutment loads and may be used to estimate stress change in pillars and thus pillar stability. In this paper, a remote entry activity monitoring strategy was proposed; three abutment loading phases in longwall mining were defined; the relationship between roof deflection and stress change in a pillar was derived; and finally the extent and magnitude of the ming-induced abutment loads as well as their impact on entry convergence were discussed using the field data obtained so far.
- OSTI ID:
- 124695
- Report Number(s):
- CONF-950811--; ISBN 0-930284-56-9
- Country of Publication:
- United States
- Language:
- English
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