Analysis of Settlement Characteristics and Strength of Cement Mixing Ratio for a Backfill Material at a Railway Abutment

Sang-Beom Yang; Chan-Yong Choi; Nak-Kyung Kim; Tae-Kyun Kim

doi:10.7843/kgs.2016.32.9.29

All Issue

2016 Vol.32, Issue 9 Preview Page Next Page

Analysis of Settlement Characteristics and Strength of Cement Mixing Ratio for a Backfill Material at a Railway Abutment 철도교대 뒤채움재료의 시멘트 혼합 비율에 따른 강도 및 침하특성 분석

30 September 2016. pp. 29-36

PDF XML

Abstract

Backfill materials of rail abutment were commonly composed with cement treated aggregate, general aggregate and soil. The friction angle of cement treated aggregate increased up to 40° or more due to strength enhancement. However, 30°～35° of friction angle was typically applied for in-situ condition. This phenomenon could cause over-designing, therefore, it is essential to determine reasonable material properties of cemented treated aggregate. In this study, a series of CBR tests and circular model tests have been conducted for cement treated aggregate, while changing cement mixing ratio. Based on test results, characteristics of settlement and strength have been analyzed quantitatively. The settlement of cement treated aggregate decreased with the number of cyclic loading and aging period. In addition, The strength increment ratio in CBR test increased up to 13～16 times at 28 days aging.

Keywords

Backfill material

Cement treated aggregate

Curing

CBR

Cyclic loading

국내 철도교대 뒤채움재의 구조는 시멘트 안정처리된 골재, 일반 골재, 토사로 되어 있다. 시멘트 안정처리된 골재는 강도 증진효과로 인해 내부마찰각이 40°이상 증가 된다. 그러나 실무에서는 교대설계 시 경험치인 30～35°의 내부마찰각을 적용한다. 이는 과다설계의 원인이 될 수 있으므로 합리적인 물성치 값의 설정이 필요하다. 본 논문은 원형모형실험과 CBR 실험을 통해 시멘트 안정처리된 골재의 시멘트 혼합 비율에 따른 강도 및 침하특성을 정량적으로 분석하였다. 시멘트 안정처리된 골재의 침하율은 반복재하 함에 따라 감소하였다. 또한 양생함에 따라 침하량이 감소하였다. 재령 28일 기준으로 일반골재 대비 시멘트 안정처리된 골재의 CBR 증가율은 13～16배 증가하였다.

References

1.Bowles, J. E. (1979), “Physical and Geotechnical Properties of Soil, McGraw-hill Book Company, USA.

2.Choi, C.Y., Kim, H.K., Chung, K.Y., and Yang, S.B. (2015), “Train- Structure Dynamic Interation Analysis of The Bridge Transition Considering Track Irregularity”, Journal of the Korean geotechnical society, Vol.31, No.9, pp.29-38.

3.Kim, K.Y., Park, H.K., and Jeon, J.S. (2005), “Strength Characteristics of Cemented Sand and Gravel”, Journal of the Korean geotechnical society, Vol.21, No.10, pp.61-71.

4.Korea Rail Network Authority (2013), Guidelines of Track Maintenance.

5.Lee, K.H., Jang, T.Y., Hwang, T.J., and Song, Y.S. (2011), “Strength Properties of Subgrade Soil Modified by Cement”, Journal of Korean Society Of Hazard Mitigation, Vol.11, No.5, pp.141-147.

6.Lee, S.W., Jeon, B.J., and Kim, J.W. (2004), “Analysis of Cha-racteristics in Low - Shrinkage Cement Treated Base”, Journal of Korean Society of Road Engineers, Vol.6, No.2, pp.61-70.

7.Min, T.K., Hwang, K.M., and Park, G.H. (2001), “Soil Stabilization with Lime and Chemical Additives”, Journal of the Korean geotechnical society, Vol.17, No.4, pp.145-151.

8.Park, S.W. and Ji, J.K.(2006), “Comparison of Mixing Methods for Stabilizing Subgrade Soils”, Conference of Korean Society of Road Engineers, Vol.2006, No.10, pp.193-197.

9.Ronald L. Terrel, Jon A. Epps, Ernest J. Barenerg, Janes K. Mitchell, and Marshall R. Thompson (1979), “Soil Stabilization In Pavement Structures A User’s Manual”, FHWA department of transportation washington, D.C. 20590.

10. Sato, Y. (1997), New railway Track engneering Mechanics.

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 32
No :9
Pages :29-36
Received Date : 2016-06-23
Revised Date : 2016-08-09
Accepted Date : 2016-09-12
DOI :https://doi.org/10.7843/kgs.2016.32.9.29

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

All Issue