Tytuł artykułu

Evaluation of Rockburst Hazard Under Abandoned Mine Workings

Tytuł czasopisma

Archives of Mining Sciences




vol. 63


No 3

Autorzy publikacji

Słowa kluczowe

mining remnants ; confined conditions ; rock mass de-stressing ; rockburst hazard

Wydział PAN

Nauki 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.


Committee of Mining PAS




Artykuły / Articles


ISSN 0860-7001