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| Title: |
| Authors: |
Marta Dolezalova, Dolexpert – Geotechnika, Prague, Czech Republic (e-mail)
Ivo Hladik, Dolexpert – Geotechnika, Prague, Czech Republic
Vlasta Zemanova, Dolexpert – Geotechnika, Prague, Czech Republic
Ivo Hladik, Dolexpert – Geotechnika, Prague, Czech Republic
Vlasta Zemanova, Dolexpert – Geotechnika, Prague, Czech Republic
The Jiri Open-Pit Coalmine, with its highly productive coal measure, is located in a
protected region of the Czech Republic that is famous for its spas and artesian thermal
springs. A pressurized aquifer underlies the mine. The mining advance is limited by the
hazard of potential hydraulic fracturing and resultant flooding of the mine, as well as by
serious changes to the hydrogeological conditions of the whole region. To prevent this
hazard, the aquifer pressure has been reduced by drainage wells. Between 1976 and the
present time, estimates were made of the feasibility of the mining advance at a
minimum pressure head reduction, i.e. for the minimum environmental impact. An
interactive procedure has been implemented using numerical models calibrated using
field measurements, and a monitoring system has been updated based on the results of
the numerical analyses. The paper describes the predicted and observed performance of
the mine in safe and critical conditions, the estimated failure mechanisms and the
hydraulic fracturing incidents that have occurred, as well as different approaches used to
assess the hydraulic fracturing hazard in various mining conditions.
protected region of the Czech Republic that is famous for its spas and artesian thermal
springs. A pressurized aquifer underlies the mine. The mining advance is limited by the
hazard of potential hydraulic fracturing and resultant flooding of the mine, as well as by
serious changes to the hydrogeological conditions of the whole region. To prevent this
hazard, the aquifer pressure has been reduced by drainage wells. Between 1976 and the
present time, estimates were made of the feasibility of the mining advance at a
minimum pressure head reduction, i.e. for the minimum environmental impact. An
interactive procedure has been implemented using numerical models calibrated using
field measurements, and a monitoring system has been updated based on the results of
the numerical analyses. The paper describes the predicted and observed performance of
the mine in safe and critical conditions, the estimated failure mechanisms and the
hydraulic fracturing incidents that have occurred, as well as different approaches used to
assess the hydraulic fracturing hazard in various mining conditions.
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| Keywords: |
| open-pit coalmine, pressurized aquifer, hydraulic fracturing hazard, safety assessment, interactive use of monitoring and modeling, finite element application |
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| Abstract: |
An open-pit coalmine surcharged by artesian water pressure
International Journal of Geoengineering Case Histories
Paper # IJGCH_1_1_5
ISSN # 1790-2045