Predicted and Back-calculated Coefficients of Permeability of Randomly Fractured Rock Mass: A Case Study
Abstract
This paper presents the discrepancy between the coefficients of permeability measured
for randomly fractured limestone using field falling-head tests and that back-calculated
for the same rock mass based on the actual discharge yielded from a dewatering system
designed for a typical construction site in Doha, Qatar. The study results showed that the
back-calculated coefficient of permeability is outside the range of the values measured
from the falling-head tests and almost seven times higher in magnitude than the fallinghead
tests average. The need of having a reliable correlation that can be used to predict
the actual permeability of randomly fractured rock in terms of its rock quality indices
and the results of the commonly conducted field falling-head test is highlighted.
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