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The foundation rock of large dams lends itself to the observation of fluid percolation in fracture networks presenting an opportunity to carry out natural analogical studies. Starting with a thorough site characterization of a selected flow region in the rock, the distribution of relative displacements and piezometric heads along arrays of boreholes should be measured. The concurrent deformation and head data, with particular emphasis on the distribution of these quantities, yield the basis for both validating currently available computer codes and improving them. The technique of instrumentation is discussed in detail introducing the recently developed Piezodex technique to measure pressure heads at numerous points along a borehole. Examples of both deformation and head measurements in the rock foundation of some dam sites illustrate the type of information to be obtained from such observations.
Authors:Kovári, Kalman and Köppel, Jakob
Index Terms:rock; TunnelingGroup
Further Information:Date published: 1985