Shear Wave Velocity Estimation of Railway Roadbed Using Dynamic Cone Penetration Index

Won-Taek Hong; Yong-Hoon Byun; Chan Yong Choi; Jong-Sub Lee

doi:10.7843/kgs.2015.31.11.25

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2015 Vol.31, Issue 11 Preview Page Next Page

Shear Wave Velocity Estimation of Railway Roadbed Using Dynamic Cone Penetration Index 동적 콘 관입지수를 이용한 철도노반의 전단파속도 추정

30 November 2015. pp. 25-31

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Abstract

Elastic behavior of the railway roadbed which supports the repeating dynamic loads of the train is mainly affected by the shear modulus of the upper roadbed. Therefore, shear wave velocity estimation of the uniformly compacted roadbed can be used to estimate the elastic behavior of the railway roadbed. The objective of this study is to suggest the relationship between the dynamic cone penetration index (DCPI) and the shear wave velocity (Vs) of the upper roadbed in order to estimate the shear wave velocity by using the dynamic cone penetration test (DCPT). To ensure the reliability of the relationship, the dynamic cone penetration test and the measurement of the shear wave velocity are conducted on the constructed upper roadbed. As a method for measurement of the shear wave velocity, cross hole is used and then the dynamic cone penetration test is performed at a center point between the source and the receiver of the cross hole. As a result of the correlation of the dynamic cone penetration index and the shear wave velocity at the same depths, the shear wave velocity is estimated as a form of involution of the dynamic cone penetration index with a determinant coefficient above 0.8. The result of this study can be used to estimate both the shear wave velocity and the strength of the railway roadbed using the dynamic cone penetrometer.

Keywords

Dynamic cone penetrometer

Railway roadbed

Shear modulus

Shear wave velocity

연속 동하중을 지지하는 철도노반의 탄성거동은 대상 상부노반의 전단탄성계수에 주된 영향을 받으므로, 일정한 다짐도로 조성된 상부노반에서의 전단파속도 획득은 대상 지반의 탄성거동 예측에 활용될 수 있다. 본 연구에서는 상부노반에서 수행된 동적 콘 관입시험(DCPT) 결과로부터 전단파속도(Vs)를 추정하기 위하여 동적 콘 관입지수(DCPI)와 전단파속도의 상호관계를 제시하고자 하였다. 상호관계의 신뢰도를 확보하기 위하여 동적 콘 관입시험 및 전단파속도 획득은 시공 완료된 철도 상부노반에서 수행되었다. 전단파속도 획득 방법으로서 cross hole 방법이 사용되었으며, 수신기와 발신기의 중간 위치에서 동적 콘 관입시험이 수행되었다. 동일한 심도에서의 동적 콘 관입지수 및 전단파속도 비교 결과, 전단파속도는 결정계수가 0.8 이상인 동적 콘 관입지수의 거듭제곱 형태로 나타났다. 본 연구결과는 동적 콘 관입기를 이용한 상부노반의 강도평가와 동시에 전단파속도 추정 방법으로써 유용하게 사용될 것이라 기대된다.

References

1.Al-Qadi, I. L., Xie, W., Roberts, R., and Leng, Z. (2010), “Data Analysis Techniques for GPR Used for Assessing Railroad Ballast in High Radio-frequency Environment”, Journal of transportation engineering, ASCE, Vol.136, No.4, pp.392-399.

2.Anbazhagan, P., Lijun, S., Buddihima, I., and Cholachat, R. (2011), “Model Track Studies on Fouled Ballast Using Ground Penetrating Radar and Multichannel Analysis of Surface Wave”, Journal of Applied Geophysics, Elsevier, Vol.74, pp.175-184.

3.ASTM D6951 (2009), Standard Test Method for Use of the Dynamic Cone Penetrometer in Shallow Pavement Applications, Annual Book of ASTM Standard 04.03, ASTM International, West Conshohocken, PA.

4.Carpenter, D., Jackson, P. J., and Jay, A. (2004), “Enhancement of the GPR Method of Railway Trackbed Investigation by the Installation of Radar Detectable Geosynthetics”, NDT & E International, Vol.37, pp.95-103.

5.Chebli, H., Clouteau, D., and Schmitt, L. (2008), “Dynamic Response of High-speed Ballasted Railway Tracks: 3D Periodic Model and in Situ Measurements”, Soil Dynamics and Earthquake Engineering, Elsevier, Vol.28, pp.118-131.

6.Lee, J. S. and Santamarina, J. C. (2005), “Bender Element: Performance and Signal Interpretation”, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.131, No.9, pp.1063-1070.

7.Park, C. S., Mok, Y. J., Hwang, S. K., and Park, I. B. (2009a), “A Methodology for Quality Control of Railroad Trackbed Fills Using Compressional Wave Velocities: 1. Preliminary Investigation”, Journal of the Korean Geotechnical Society, Vol.25, No.9, pp.45-55 (in Korean).

8.Park, C. S., Mok, Y. J., Hwang, S. K., and Park, I. B. (2009b), “A Methodology for Quality Control of Railroad Trackbed Fills Using Compressional Wave Velocities: 2. Verification of Applicability”, Journal of the Korean Geotechnical Society, Vol.25, No.9, pp.57-66 (in Korean).

9.Robertson, P. K., Campanella, R. G., Gillespie, D., and Rice, A. (1986), “Seismic CPT to Measure in Situ Shear Wave Velocity”, Journal of Geotechnical Engineering, ASCE, Vol.112, No.8, pp. 791-803.

10.Santamarinal, J. C., Klein, A., and Fam, M. A. (2001), Soils and waves: Particulate materials behavior, characterization and process monitoring, John Wiley and Sons, NY, 508.

11.Scala, A. J. (1956), “Simple Methods of Flexible Pavement Design Using Cone Penetrometers”, New Zealand Engineering, Vol.11, No.2, pp.34-44.

12.Vo, P. T., Ngo, H. H., Guo, W., Zhou, J. L., Listowski, A., Du, B., Wei, Q., and Bui, X. T. (2015), “Stormwater Quality Management in Rail Transportation - Past, present and future”, Science of the Total Environment, Elsevier, Vol.512-513, pp.353-363.

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 31
No :11
Pages :25-31
Received Date : 2015-07-30
Revised Date : 2015-09-29
Accepted Date : 2015-09-30
DOI :https://doi.org/10.7843/kgs.2015.31.11.25

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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