High horizontal stress effects on longwall gate entry stability

Conference · Sun Dec 01 04:00:00 UTC 1996

OSTI ID:405573

Wang, Yajie; Peng, S S ^[1]

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1. West Virginia Univ., Morgantown, WV (United States)

High horizontal stress and its adverse effects on longwall gate entries have been witnessed in many US coal mines for the past years. It can cause cutter roofs and leads to roof falls either in the headgate or tailgate entries depending on the relative orientation of the panel to the maximum principal horizontal stress. Underground observations have shown that if the maximum principal horizontal stress is perpendicular to the panel entries, the roof is in the worst condition and if the maximum principal horizontal stress is parallel to the entries, the entry is in the best condition. However, little has been done about the high horizontal stress effects on panel entries subject to different orientations of high horizontal stress. In order to design a longwall panel and control the roof effectively, the redistribution and concentration of high horizontal stress field must be fully understood. Using 3-D finite element analysis, this paper presents the high horizontal stress redistribution and concentration for a retreat longwall face with different orientations of high horizontal stress. Based on the results, possible roof failures for different orientations of high horizontal stress are analyzed. A panel design criterion is recommended.

• OSTI ID: 405573
• Report Number(s): CONF-9608121--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL MINING
FINITE ELEMENT METHOD
GROUND MOTION
GROUND SUBSIDENCE
LONGWALL MINING
ROOFS
STABILITY
STRATA CONTROL
STRESSES