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ABSTRACT
Fractures play an important role both in the engineering
behaviors and groundwater movement of rock masses. A
description of the fracture geometry pattern is a primary
requirement to assess the hydraulic and mechanical behaviors of
jointed rock masses.
To enhance the reliability of fracture data, this paper firstly
proposes some analytical techniques based on statistical
approaches to characterize and analyze the variability of
fracture pattern. In order to estimate the hydraulic
conductivity, a fractured rock mass which contains a lot of
fractures, is assumed to be a homogenous and anisotropic porous
medium. On the basis of theoretical derivation, laboratory and
field data obtained from outcrops, model of estimating the
hydraulic conductivity of fractur rocks is presented. In this
study an attempt is made to estimate the relationship between
the hydraulic conductivity and fracture pattern. The new model
includes effects of hydromechanical coupling, normal closure and
fracture geometry. Finally, an actual rock mass of jointed
andesite rock on the Lan-Yu site, Taiwan, was studied to predict
the hydraulic conductivity with depth.
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