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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
국제구조공학회 Smart Structures and Systems, An International Journal Smart Structures and Systems, An International Journal Vol.15 No.4
발행연도
2015.1
수록면
1,085 - 1,101 (17page)

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Changes in substructure conditions, such as ballast fouling and subgrade settlement may causethe railway quality deterioration, including the differential geometry of the rails. The objective of this studyis to develop and apply a hybrid cone penetrometer (HCP) to characterize the railway substructure. The HCPconsists of an outer rod and an inner mini cone, which can dynamically and statically penetrate the ballastand the subgrade, respectively. An accelerometer and four strain gauges are installed at the head of the outerrod and four strain gauges are attached at the tip of the inner mini cone. In the ballast, the outer rod providesa dynamic cone penetration index (DCPI) and the corrected DCPI (CDCPI) with the energy transferred intothe rod head. Then, the inner mini cone is pushed to estimate the strength of the subgrade from the cone tipresistance. Laboratory application tests are performed on the specimen, which is prepared with gravel andsandy soil. In addition, the HCP is applied in the field and compared with the standard dynamic conepenetration test. The results from the laboratory and the field tests show that the cone tip resistance isinversely proportional to the CDCPI. Furthermore, in the subgrade, the HCP produces a high-resolutionprofile of the cone tip resistance and a profile of the CDCPI in the ballast. This study suggests that thedynamic and static penetration tests using the HCP may be useful for characterizing the railway substructure.

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