Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

Jiri Open-Pit Coalmine with highly productive coal measure is located in a famous and protected spa region with artesian thermal springs. A pressurized aquifer underlies the mine and the mining advance is limited by hydraulic fracturing hazard, which could result not only in flooding the mine, but also in dangerous changes of the hydro-geological conditions of the whole region. To prevent this hazard, the aquifer pressure has been reduced by flowing wells. To estimate the feasibility of the mining advance at a minimum pressure head reduction, i.e. at minimum environmental impact, an interactive procedure with numerical models calibrated according to field measurements and monitoring system updated according to numerical solutions has been applied since 1976 up to the present time. The predicted and observed performance of the mine in safe and critical conditions, the estimated failure mechanisms and the accidents occurred, as well as different approaches to the assessment of hydraulic fracturing hazard in varying mining conditions are described in the paper.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Case History of an Open-Pit Coalmine Loaded by Artesian Water Pressure

New York, New York

Jiri Open-Pit Coalmine with highly productive coal measure is located in a famous and protected spa region with artesian thermal springs. A pressurized aquifer underlies the mine and the mining advance is limited by hydraulic fracturing hazard, which could result not only in flooding the mine, but also in dangerous changes of the hydro-geological conditions of the whole region. To prevent this hazard, the aquifer pressure has been reduced by flowing wells. To estimate the feasibility of the mining advance at a minimum pressure head reduction, i.e. at minimum environmental impact, an interactive procedure with numerical models calibrated according to field measurements and monitoring system updated according to numerical solutions has been applied since 1976 up to the present time. The predicted and observed performance of the mine in safe and critical conditions, the estimated failure mechanisms and the accidents occurred, as well as different approaches to the assessment of hydraulic fracturing hazard in varying mining conditions are described in the paper.