Tytuł artykułuEvaluation of Rockburst Hazard Under Abandoned Mine Workings
Tytuł czasopismaArchives of Mining Sciences
Słowa kluczowemining remnants ; confined conditions ; rock mass de-stressing ; rockburst hazard
Wydział PANNauki o Ziemi
Archives of Mining Sciences (AMS) publish research results of wide interest in all fields of mining sciences which include: rock mechanics, mining engineering, mineral processing, geotechnical engineering and tunnelling, mining and engineering geology, minig geodesy and geophysics, ventilation systems, environmental protection in mining and economical aspects in mining.
The journal established by the Polish Academy of Sciences, has been regularly issued since 1956. It enable collaboration and exchange of ideas between researchers from different countries as well as provides forum for the publication of high quality papers.
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Recalling the body of experience gathered in the collieries of the Upper Silesian Coal Basin, the
increased risk of seismicity and rockburst occurrences in confined conditions including the exploitation of
remnants were identified. This study investigates geomechanical aspects of longwall mining in the areas
affected by old excavations aimed at relaxation of a multi-bed deposits within a thick coal seam or a group
of seams. It is assumed that high-energy seismicity is another factor determining the rockburst hazard
alongside the state of stress. A case study is recalled, describing a colliery where mining-induced seismic
activity of a de-stressed coal seam remained at the level comparable to or higher than it was experienced
in the de-stressed seam operations. An analytical model was used to study the stress state and potential
loss of structural continuity of an undisturbed rock body surrounding the longwall panel being mined
beneath or over the abandoned workings. Recalling the developed model of the system involving nonlinear
functions demonstrating the existence of abandoned mine workings within the rock strata, computer
simulations were performed to evaluate the rockburst hazards along the face area. Discussions of results
are based on observations of immediate roof convergence and the vertical stress concentration factor at
the longwall face zone. Computational data of the modelled mining situations demonstrates that despite
using the de-stressing method of mining, the occurrence of events impacting on mine working beneath
and over abandoned workings cannot be precluded. Here the scale of rockburst hazards is determined by
local mining and geological conditions, such as the type and extent of abandoned workings, their age and
vertical distance between them and the coal seam currently mined.
WydawcaCommittee of Mining PAS
TypArtykuły / Articles