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Underground Research Laboratory Shaft Excavation Drawdown Experiment: Comparison of Predicted Seepage and Drawdown with Field Measurements
During 1984 to 1985 AECL Research constructed the shaft of the Underground Research Laboratory (URL) to a depth of 255 m in a previously undisturbed portion of the granitic Lac du Bonnet Batholith in southeastern Manitoba. Prior to shaft construction, models were developed of the groundwater flow conditions and these were used to predict both the seepage of groundwater into the shaft excavation, and the drawdown in hydraulic head conditions in the rock mass surrounding the excavation. Time-varying hydraulic head responses were predicted for 146 different piezometer intervals in a network of monitoring boreholes at the URL site. Predictions were made by INTERA using a groundwater flow model based on the SWIFT finite difference code, and by AECL using a model based on the MOTIF finite element code. Groundwater seepage rates into the shaft were monitored during and after shaft excavation and hydraulic heads were measured in the 146 different piezometer intervals in the rock surrounding the shaft. These monitoring records have been maintained continuously since shaft excavation began to allow a comparison between the model predictions and actual observations. The report presents a compilation and comparison of all the observed and predicted hydrogeologic responses associated with constructing the URL shaft to 255 m depth.
Underground Research Laboratory Shaft Excavation Drawdown Experiment: Comparison of Predicted Seepage and Drawdown with Field Measurements
During 1984 to 1985 AECL Research constructed the shaft of the Underground Research Laboratory (URL) to a depth of 255 m in a previously undisturbed portion of the granitic Lac du Bonnet Batholith in southeastern Manitoba. Prior to shaft construction, models were developed of the groundwater flow conditions and these were used to predict both the seepage of groundwater into the shaft excavation, and the drawdown in hydraulic head conditions in the rock mass surrounding the excavation. Time-varying hydraulic head responses were predicted for 146 different piezometer intervals in a network of monitoring boreholes at the URL site. Predictions were made by INTERA using a groundwater flow model based on the SWIFT finite difference code, and by AECL using a model based on the MOTIF finite element code. Groundwater seepage rates into the shaft were monitored during and after shaft excavation and hydraulic heads were measured in the 146 different piezometer intervals in the rock surrounding the shaft. These monitoring records have been maintained continuously since shaft excavation began to allow a comparison between the model predictions and actual observations. The report presents a compilation and comparison of all the observed and predicted hydrogeologic responses associated with constructing the URL shaft to 255 m depth.
Underground Research Laboratory Shaft Excavation Drawdown Experiment: Comparison of Predicted Seepage and Drawdown with Field Measurements
C. C. Davison (author) / E. T. Kozak (author) / D. R. Daymond (author)
1995
181 pages
Report
No indication
English
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