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Utilization of Induced Polarization and Electrical Resistivity for Identifying Rock Condition
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 Title & Authors
Utilization of Induced Polarization and Electrical Resistivity for Identifying Rock Condition
Park, Jinho; Ryu, Jinwoo; Jung, Jeehee; Lee, In-Mo;
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This study examines how rock condition affects the variation of the chargeability and electrical resistivity of the rock. In the theoretical study, the relationship correlating chargeability with the variables affecting it is derived. A parametric study utilizing the derived relationship reveals that the size of narrow pores () is the most influential factor on chargeability, and the salinity of pore water () is the second. In the laboratory experiments, small scale rock fracturing zone is modelled using sand stone. Chargeability and resistivity are measured by changing the size of the joint aperture, the location of fractured zone and the existence of clay gouge and/or clay layer which shows lower chargeability than the sand stone layer in the multi-layered ground. Test results show that chargeability is controlled not by the rock fracturing condition but by the size of narrow pore () where each line of current flow passes through. Also, the chargeability decreases with increase of the pore water salinity (). In conclusion, the ground condition can be identified more efficiently by measuring the induced polarization along with the electrical resistivity; identifying the existence of sea water, the layered ground and/or the fractured rock becomes more reliable.
Rock fracture;Rock joint;Induced polarization;Chargeability;Electrical resistivity;
 Cited by
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