2011
INTERNATIONAL MINING FORUM 2011
48
Martin Junker, RAG Mining Solutions GmbH, Herne, Germany, Marek Growiec, RAG Mining Solutions GmbH,
Katowice, Poland
Planning of galleries for high performance longwall production
in thin coal seams
Planning work, roadway development and excavation are the main intervals of the lifecycle for a roadway in longwall
coal mining. The standard system of planning, which is offered by the German RAG Mining Solutions GmbH follows this
phases and is focused on the geological and geotechnical preconditions, the stress distribution influenced by multiple
seam working and a wide range of support elements and systems available. Continuous enhancements of monitoring
and equipment within the past 25 years give the opportunity of development and use of the roadways with minimum
technical risk. The following paper gives an overview to this lifecycle and the know-how of RAG Mining Solutions either
for matters planning or of processing under the preconditions of a difficult deposit, a wide range of mine layout variations
and various support systems.
Stanisław Prusek – Główny Instytut Górnictwa, Poland
Selected methods of forecasting gate roads deformation
This paper presents selected methods of forecasting gate roads deformation in countries where underground mining of
hard coal takes place. Two of those methods, developed at the Central Mining Institute, have been presented in more
detail. The methods are based on the results of the research on horizontal and vertical convergence in gate roads main-
tained behind the longwall face with roof caving. First method is based on empirical relationships determined by statisti-
cal methods. The second one relies on the modified Hoek’s Brown failure criterion and allows to predict the deformation
of gate roads by means of numerical calculations with Phase software.
Janusz Chmielewski, Bolesław Kozek – Lubelski Węgiel Bogdanka S.A., Poland
Evolution of the Methods of Maintaining Longwall Galleries in the LW Bogdanka S.A.
Mine
The article presents the current ways of managing and maintaining longwall galleries in the mine of Lubelski Węgiel Bog-
danka. It discusses experiences related to the “towards field” mining system, which was used in 1982-1990, along with
maintaining longwall galleries behind the wall. It describes the presently used mining system, “from field”, and the way
of exploiting longwall galleries in that system. It presents types of the gallery support system used and its modifications
which took place over years of mining activity, as well as ways to reinforce the support system for the purpose of main-
taining the wall-gallery crossing. It discusses new conditions concerning longwall galleries for plough walls.
Andrzej TOR, Ph.D., Rafał DOBRZYŃSKI, M. Sc., Kazimierz KOLIŃSKI, Eng. Jastrzębska Spółka Węglowa S.A.,
Jastrzębie-Zdrój, Poland
Maintaining longwall headings in the mines of JSW S.A.
The article presents the problem of stability of longwall headings behind the exploitation face and the reason for their
maintaining. Furthermore, exemplary methods of maintaining headings behind longwall exploitation face in the mines of
JSW S.A. were shown depending on geological and mining conditions and the role of the heading.
Stanisław Prusek, Marek Rotkegel – Główny Instytut Górnictwa, Katowice, Poland
Modern methods of designing supports of excavations for plow longwalls
Effective extraction of hard coal with the use of plow technique results in the fact that many issues within mine techno-
logies need to be solved. One of the most important is performing a proper design of the support of excavations and
its reinforcement. Generally, it means that the support may be adjusted to secure the T-junction so that the extraction
process is effective and safe. In this paper the most important phases of designing the support of dog headings, by
use of the method invented in the GIG, have been described. There are also examples of the supports of plow longwall
gateroads, lately driven in mines “Zofiowka” and “Bogdanka”.
Session: Construction and maintenance
of opening-out headings for plow longwalls
Abstracts of the conference papers