Evaluation of the Active Layer using Dynamic Cone Penetrometer

초록

In the extreme cold region, an accurate characterization of the active layer is essential because the infrastructures such as roads and railways are seriously affected by the force of frost heave of the active layer. In this study, the dynamic cone penetrometer (DCP) is applied for the evaluation of thickness of the active layer. In addition, the ground penetrating radar (GPR) is used for the estimation of the electromagnetic property in the active layer. From the DCP test and the GPR survey, dynamic cone penetration index (DCPI) is obtained along the penetration depth and the dielectric constant in the active layer is calculated using the evaluated thickness of the active layer and travel time of the measured electromagnetic wave. Experimental results show that the thickness of the active layer is estimated approximately 630 mm, and the dielectric constant of the active layer is calculated as 28. This study suggests that the DCP and GPR may be effectively used for characterization of the active layer."