The role of hydromechanical coupling in fractured rock engineering |
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| Authors: | Email author" target="_blank">Jonny?RutqvistEmail author Ove?Stephansson |
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| Institution: | (1) Lawrence Berkeley National Laboratory, Earth Sciences Division, MS 90-1116, 94720, Berkeley, CA, USA,;(2) Royal Institute of Technology, Department of Land and Water Resources Engineering, 100-44, Stockholm, Sweden,;(3) GeoForschungsZentrum, , 14473, Potsdam, Germany, |
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| Abstract: | This paper provides a review of hydromechanical (HM) couplings in fractured rock, with special emphasis on HM interactions
as a result of, or directly connected with human activities. In the early 1960s, the coupling between hydraulic and mechanical
processes in fractured rock started to receive wide attention. A series of events including dam failures, landslides, and
injection-induced earthquakes were believed to result from HM interaction. Moreover, the advent of the computer technology
in the 1970s made possible the integration of nonlinear processes such as stress–permeability coupling and rock mass failure
into coupled HM analysis. Coupled HM analysis is currently being applied to many geological engineering practices. One key
parameter in such analyses is a good estimate of the relationship between stress and permeability. Based on available laboratory
and field data, it was found that the permeability of fractured rock masses tends to be most sensitive to stress changes at
shallow depth (low stress) and in areas of low in-situ permeability. In highly permeable, fractured rock sections, fluid flow
may take place in clusters of connected fractures which are locked open as a result of previous shear dislocation or partial
cementation of hard mineral filling. Such locked-open fractures tend to be relatively insensitive to stress and may therefore
be conductive at great depths. Because of the great variability of HM properties in fractured rock, and the difficulties in
using laboratory data for deriving in-situ material properties, the HM properties of fractured rock masses are best characterized
in situ.
Electronic Publication |
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| Keywords: | Fractured rocks Mechanical Hydromechanical coupling Stress Permeability |
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