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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국농공학회 한국농공학회논문집 한국농공학회논문집 제61권 제2호
발행연도
2019.1
수록면
41 - 50 (10page)

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Stiffness characteristic of subgrade is one of the most important aspects for the design and evaluation of pavement and railway. However, adequatefield testing methods for evaluating the stiffness characteristics of the subgrade have not been developed yet. In this study, an in-situ dynamic stiffnessanalyzer (IDSA) is developed to evaluate the characteristics of subgrade stiffness along the depth, and its performance is evaluated in elastic materialsand a compacted soil. The IDSA consists of a falling hammer system, a connecting rod, and a tip module. Four strain gauges and an accelerometerare installed at the tip of the rod to analyze the dynamic response of the tip generated by the drop of hammer. Based on the Boussinesq’s method,the stiffness and Young’s modulus of the specimens can be calculated. The performance of IDSA was tested on three elastic materials with differenthardness and a compacted soil. For the repeatability of test performance, the dynamic signals for force and displacement of the tip are averaged fromthe hammer impact tests performed five times at the same drop height. The experimental results show that the peak force, peak displacement, and theduration depend on the hardness of the elastic materials. After calculating the stiffness and elastic modulus, it is revealed that as the drop height ofhammer increases, the stiffness and elastic moduli of MC nylon and the compacted soil rapidly increase, while those of urethanes less increase.

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