Simulation of groundwater drainage into a tunnel in fractured rock and numerical analysis of leakage remediation, Romeriksporten tunnel, Norway |
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Authors: | N-O Kitterød H Colleuille W Wong T Pedersen |
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Institution: | (1) University of Oslo, Department of Geophysics, P.O. Box 1022, Blindern, 0315 Oslo, Norway,;(2) Norwegian Water Resources and Energy Directorate, Hydrology Department, P.O. Box 5091, Majorstua, 0301 Oslo, Norway, |
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Abstract: | Standard geostatistical methods for simulation of heterogeneity were applied to the Romeriksporten tunnel in Norway, where
water was leaking through high-permeable fracture zones into the tunnel while it was under construction, causing drainage
problems on the surface. After the tunnel was completed, artificial infiltration of water into wells drilled from the tunnel
was implemented to control the leakage. Synthetic heterogeneity was generated at a scale sufficiently small to simulate the
effects of remedial actions that were proposed to control the leakage. The flow field depends on the variance of permeabilities
and the covariance model used to generate the heterogeneity. Flow channeling is the most important flow mechanism if the variance
of the permeability field is large compared to the expected value. This condition makes the tunnel leakage difficult to control.
The main effects of permeability changes due to sealing injection are simulated by a simple perturbation of the log-normal
probability density function of the permeability. If flow channeling is the major transport mechanism of water into the tunnel,
implementation of artificial infiltration of water to control the leakage requires previous chemical-sealing injection to
be successful.
Electronic Publication |
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Keywords: | fractured rocks geostatistics surface drainage tunnel leakage artificial infiltration |
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