TITLE:
Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining
AUTHORS:
Mingwei Zhang, Hideki Shimada, Takashi Sasaoka, Kikuo Matsui
KEYWORDS:
Lateral Stress Concentration; Interlayer Rock Stratum; Multi-Seam Coal Mining; Stress Relaxation Zone; Floor Failure Behavior
JOURNAL NAME:
International Journal of Geosciences,
Vol.4 No.9,
November
13,
2013
ABSTRACT:
To explore the impact of lateral stress concentration in
interlayer rock stratum on the exploitation of protected coal seam, a field
experiment was carried out in a multi-seam mining structure. Lateral stress
redistribution and interlayer rock failure behavior were surveyed. Then an
assistant numerical investigation was implemented to evolve the effect of
liberated seam mining and its influence on stress reconstruction in surrounding
rock mass. The cause of lateral stress concentration and its impact were
discussed finally. Key findings turn out that a certain lateral stress
increases in interlayer rock stratum and concentrates on its lower region.
Lateral stress concentration and interlayer rock failure are interactional. The
former is an inducing factor of the latter; the latter promotes the increase of
concentration degree. Extent of lateral stress concentration increases to the
maximum as seam distance is about 50 m. But the efficacy of liberated seam mining
decreases as the seam spacing gets larger. Protected seam mining is then
classified based upon the impact of lateral stress concentration, which helps
to prevent the rock burst hazard and then to achieve a reliable mining in deep
mines.