To determine the stress and damage state of rock mass
is important
for many geotechnical engineering. To study the feasibility of resistivity
measurement in characterizing the damage and stress state, the resistivity
measurement, uniaxial compression test, and incremental loading–unloading
compression test were carried out on granite samples with different
porosities (induced by different treatment temperatures). Results
show that the resistivity is very sensitive to thermal damage and
mechanical damage during compression. The evolution of resistivity
can not only quantify thermal damage but also clearly indicate the
critical stress (crack closure stress and crack damage stress) and
damage stage during compression. In addition, the resistivity evolution
was quite different in the pore closure stage, elastic deformation
stage, and unstable cracking stage during the loading–unloading
process, which is useful in field stress and damage state identification
for field monitoring. The conductive mechanism variation during compression
was discussed using the Archie equation considering crack volume strain
evolution during the mechanical damage process. Overall, the resistivity
measurement holds great potential in geotechnical engineering for
field monitoring.
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