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Sciences in Cold and Arid Regions ›› 2022, Vol. 14 ›› Issue (4): 282–286.doi: 10.1016/j.rcar.2022.09.006.

• • 上一篇    

  

  • 收稿日期:2021-11-05 接受日期:2022-01-08 出版日期:2022-08-31 发布日期:2022-09-30

Application of automated cone penetrometer for railway investigation using correlations with DCPI and Deflection Modulus

Yeob Kim Sang1,Won-Taek Hong2,Jong-Sub Lee1()   

  1. 1.School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Republic of Korea
    2.Department of Civil & Environmental Engineering, Gachon University, Seongnam-si 13120, Republic of Korea
  • Received:2021-11-05 Accepted:2022-01-08 Online:2022-08-31 Published:2022-09-30
  • Contact: Jong-Sub Lee E-mail:jongsub@korea.ac.kr
  • Supported by:
    the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT)(NRF-2021R1A5A1032433)

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Abstract:

Portable in-situ devices have been used for characterizing low accessible field, such as the railway subgrade. In this study, the automated cone penetrometer (ACP) was designed for the application on the railway subgrade. ACP is composed of the cone tip, driving rod, and hydraulic hammer system. The hydraulic motor lifts and drops the 294.3 N hammer from a height of 200 mm such that the potential energy of 58.9 N?m impacts the driving rod. The N-value (NACP) from the ACP test was compared with the dynamic cone penetration index (DCPI) from the dynamic cone penetrometer (DCP) test. The test results show that the NACP and DCPI profiles show opposite trend owing to the inverse concept of the unit. From the correlation of DCPI and NACP, the limitation of DCPI reveals owing the minimum manually measured value of 1 mm/blow. Additionally, the evaluation of the deflection modulus (EFWD) using NACP is more efficient than that using DCPI. Based on the result of this study, we suggest that ACP can be used for strength and stiffness evaluation of railway subgrade rapidly and reliably.

Key words: automated cone penetrometer, DCPI, EFWD, NACP, railway subgrade

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