Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Excessive Settlement Back-Analysis of Railway Embankment on Soft Soils during Service

  • Ahn, Taebong (Department of Railroad Construction System, Woosong University)
  • Received : 2018.09.14
  • Accepted : 2018.11.14
  • Published : 2019.01.01
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Abstract

This paper presents case history of railway embankment excess settlement on soft clay during service in southern region of Korea. A lot of field observations show that the measured settlements are a lot larger than settlements actually calculated in this area. Back analysis is carried out to verify the soil parameters which are intended to investigate in the subsurface exploration phase and later in a laboratory test program. Recommendations and causes for the engineering practice are suggested to review the determination of excess settlements and, consequently, to improve the settlement prediction. This enormous discrepancy is due to the passing over secondary consolidation, and the design filling did not meet to real construction filling. Immediate settlement could be subsidiary factor of excess settlement.

Keywords

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Fig. 1. Plasticity chart of clay soils

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Fig. 2. Distribution of passing percent of No.200 sieve

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Fig. 3. Water content distribution

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Fig. 4. Liquid index distribution

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Fig. 5. Distribution of OCR

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Fig. 6. Back analysis of section 3 (SP3-12)

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Fig. 7. Back analysis of section 4 (SP4-2-7)

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Fig. 8. Back analysis of section 5 (SP5-2-3)

Table 1. Soil profiles

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Table 2. Soil parameters

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Table 3. Back analysis results of the consolidation

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References

  1. Asaoka, A. (1978), Observational Procedure of Settlement Prediction, Soil and Foundations, Vol. 18(4), pp. 87-101. https://doi.org/10.3208/sandf1972.18.4_87
  2. Mesri, G. (1973), Coefficient of secondary settlement, Journal of the Geotechnical Engineering Division, ASCE, Vol. 99(1), pp. 123-137.
  3. Mesri, G. and Choi, Y. K. (1985), Settlement Analysis of Embankments on Soft Clay", Journal of the Geotechnical Engineering Division, ASCE, Vol. 111(4), pp. 441-464. https://doi.org/10.1061/(ASCE)0733-9410(1985)111:4(441)
  4. Terzaghi, K. V. and Peck, R. (1967), Soil Mechanics in Engineering Practice, John Wiley & Sons Inc., New York.