Multislice Longwalling for Thick Seam Extraction - Properties of Goaf in the Roof and Gate Roads Behaviour AusRock 2014: Third Australasian Ground Control in Mining Conference 5–6 November 2014, Sydney, Australia Presenter: Stanisław Prusek Authors: Prusek S.,¹ Lubosik Z¹., Płonka M 1 ., and Syrek B² ¹ Główny Instytut Górnictwa (GIG), Poland ² Katowicki Holding Węglowy SA (KHW), Poland
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Multislice Longwalling for Thick Seam Extraction ... Longwalling for Thick Seam Extraction - Properties of Goaf in the Roof ... Some data on Polish hard coal mining industry.
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Multislice Longwalling for Thick Seam
Extraction - Properties of Goaf in the Roof
and Gate Roads Behaviour
AusRock 2014: Third Australasian Ground Control in Mining Conference
5–6 November 2014, Sydney, Australia
Presenter: Stanisław Prusek Authors: Prusek S.,¹ Lubosik Z¹., Płonka M1., and Syrek B²
¹ Główny Instytut Górnictwa (GIG), Poland ² Katowicki Holding Węglowy SA (KHW), Poland
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 2
PRESENTATION OUTLINE
Some information on Central Mining Institute (GIG).
Some data on Polish hard coal mining industry.
General information concerning Thick Coal Seams Extraction.
Properties of Goaf in the Roof and Gate Roads Behaviour –
underground measurements.
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 3
Some information on Central
Mining Institute (GIG)
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 4
The Central Mining Institute (in Polish: Główny Instytut Górnictwa, in brief: GIG)
Research institute, established 1945,
Subordinates to the Minister of Economy of Poland,
Employees (2013) – 578 people, including 14 professors and 15 Assoc. Prof.,
Notifying Body No. 1453 of the European Union within the range of the
directives:94/9/WE (ATEX),98/37/WE (machinery), 93/15/WE (explosives for the civil use),
and explosion-proof safety according to the world certification system IECEx,
The Scientific Council holds full academic authorizations to grant the degree of
doctor and doctor habil., and to apply for the title of professor in mining (since 1961) and
environmental engineering (since 1998).
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 5
Basic areas of GIG activity
SOCIO-ECONOMIC STUDIES
OCCUPATIONAL SAFETY IN THE INDUSTRY
MATERIAL ENGINEERING
CERTIFICATION, ATTESTATION, INTEGRATED
MANAGEMENT SYSTEMS
MINING AND GEOENGINEERING
ENVIRONMENTAL ENGINNERING
TRAINING AND EDUCATION
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 6
An unique place for mining investigations in a real scale
Experimental Mine „Barbara”
COAL DUST EXPLOSION IN EXPERIMENTAL GALLERY
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 7
Some data on Polish hard coal
mining industry
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 8
Coal is the major fuel used for generating electricity in Poland.
About 86 % of electricity is produced in coal-fired power plants.
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 9
Location of Polish coal basins and coal production in Poland in 2013
Total – 142.3 Mt
Hard coal – 76.5 Mt
Lignite (brown coal) – 65.8 Mt
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 10
Production – 76.5 Mt,
(64.4 Steam coal, 12.1 Coking coal)
Number of underground mines – 30,
Employees – about 107 000 workers,
Extraction system –107 single entry retreat
longwalls were employed, 101 longwalls with
natural roof caving and 6 with hydraulic backfilling
Average extraction depth - 713 m.
Polish hard coal mining industry in 2013
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 11
Gas hazard
Fire hazard
Dust hazard
Seismic and rock burst hazard
Water hazard
Climatic hazard
Radiation hazard
The coal seams are mined in conditions of natural hazards:
Such mining conditions negatively
affect the costs of mining activity
of Polish companies
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 12
General information concerning
Thick Coal Seams Extraction
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 13
Among the methods commonly used for thick coal seams extraction the
following can be mentioned:
Single pass longwall (SPL)
Multi-slice longwall (MSL)
Longwall top coal caving (LTCC).
B.Hebblewhite, Morgantown 2013
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 14
In Poland Multi-slice longwalling (MSL) is employed
the coal seams are extracted in slices with:
roof caving, extraction from top to bottom
(descending order),
hydraulic backfilling, extraction from bottom to top
(ascending order),
combination of the above two systems (hybrid).
Underlying slice is mostly
mined after 2-3 years
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 15
Properties of Goaf in the Roof and
Gate Roads Behaviour –
underground measurements
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 16
IMPREX
PROJECT
Realized
in years
2008-2011
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 17
Multi-slice longwalling in KHW Company
data collected from 24 longwalls
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 18
Average values of coal beam thickness and coal UCS in the longwalls
operated under previously extracted upper slice of the seam
DEPARTMENT OF EXTRACTION TECHNOLOGIES AND MINING SUPPORT www.gig.eu 19
Underground measurements were carried out in three longwall panels