![]() Under pressure, mean under-pressure on the intrados of the sealing x, x′: Under-pressure, mean under-pressure on tunnel edge u e, \(\bar \) i Radius at the intrados of the sealing T m Radius at the extrados of the sealing r i Radius of the tunnel or extrados of the sealing r e Hydraulic conductivity of the sealed zone or lining n: Hydraulic conductivity of the rock mass k s Infinitesimal arc length along a curve D:ĭrawdown of the water table relatively to the reservoir level G:Įlevation of the reservoir level above the tunnel H:Įlevation of the reservoir level above an impervious base k: Quotient of the water inflow to the pressure difference in an annular sealing C:ĭistance of the tunnel to the reservoir ds: Quotient of the water inflow to the pressure difference in aquifer B: The comparison of the calculated hydraulic conductivity with the available information from measurements with packer tests and DFN predictions will reveal the importance of scale effects and uncertainties. These equations are used to assess the water table elevation in the exploratory boreholes, calculate the hydraulic conductivity of the rock mass from the measured seepage in the conveyance tunnel, and determine the efficiency of the sealing from the measured back pressure on the extrados of the drainage gallery. Two new equations are obtained: one for inflow of water and the other for the water table drawdown. The peculiarity of the model is that it considers a draining tunnel in an open aquifer with a free water table. ![]() Special analytic developments have been carried out to analyze the behavior of the water table during impoundment. The lower level of the water table is due to underground tunnels and galleries that behave as drains. The water table has remained below the level of the reservoir. On the right bank, the elevation of the water table is monitored in exploratory boreholes. The impoundment of the Rudbar dam raised underground water level. ![]()
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