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Evaluation of Active Layer Depth using Dynamic Cone Penetrometer
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 Title & Authors
Evaluation of Active Layer Depth using Dynamic Cone Penetrometer
Hong, Won-Taek; Kang, Seonghun; Park, Keunbo; Lee, Jong-Sub;
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 Abstract
An active layer distributed on surface of an extreme cold region causes a frost heave by repeating the freezing and thawing according to the seasonal temperature change. Since the height of frost heave is greatly affected by the thickness of active layer, an accurate evaluation of the thickness of active layer is necessary for the safe design and construction of the infrastructure in the extreme cold region. In this study, dynamic cone penetrometer, which is miniaturized in-situ penetration device, is applied for the evaluation of active layer depth distribution. As the application tests, two dynamic cone penetration tests were conducted on the study sites located in Solomon and Alaska. In addition, ground temperature variations were obtained. As the results of the application tests, the depth of interface between the active layer and the permafrost was evaluated from the difference in dynamic cone penetration indexes of the active layer and the permafrost, and a layer was detected around the interface considered as an ice lens layer. Also, the interface depths between the above zero and the below zero temperature determined from the ground temperature variations correspond with the interface depths evaluated from the dynamic cone penetration tests. This study demonstrates that the dynamic cone penetrometer may be a useful tool for the evaluation of the active layer in the extreme cold region.
 Keywords
Active layer;Dynamic cone penetrometer;Extreme cold region;Permafrost;Ice lens;
 Language
Korean
 Cited by
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