An Experimental Study on the Settlement Characteristics of Soft Ground in the Central West Coast Region

doi:10.15683/kosdi.2021.12.31.786

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2021 Vol.17, Issue 4 Preview Page Next Page

Original Article

An Experimental Study on the Settlement Characteristics of Soft Ground in the Central West Coast Region 서해안 중부지역 연약지반의 침하특성 분석을 위한 실험적 연구: 김준석*
Joon-Seok Kim*; Professor, Department of civil and envirnmental engineering, Chungwoon University, Incheon, Republic of Korea

31 December 2021. pp. 786-793

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Abstract

Purpose: An experiment was conducted to analyze the characteristics of the settlement of soft clay soil in the central region of the west coast of Korea, which has a high silt content and is difficult to predict settlement due to various stress histories. Method: Field experiments were conducted for three cases. The settlement amount of the subsidence plate was measured in each case, and the following conclusions were drawn by analyzing Terzaghi's one-dimensional consolidation settlement amount, both the hyperbolic method and the Asaoka method. Result: The predicted value by Terzaghi was analyzed to be the largest in all cases, and it was predicted to be 111% to 187% larger than the subsidence plate settlement value. That is, the subsidence plate settlement value, which is the amount of settlement of the actual ground, showed a settlement of 53.4~89.9% compared to the predicted value of Terzaghi. Therefore, it was analyzed that the expected settlement of the Terzaghi method in the clay soft ground of the central west coast of Korea is more than the actual settlement. Conclusion: It was analyzed that the Asaoka method and the hyperbolic method presented relatively similar results, and in practice, predicting the settlement amount smaller than the actual settlement amount may cause a risk, so the hyperbola analysis method predicted 6~14% larger than the actual settlement amount can be used as a safety side.

Keywords

Soft Ground

Consolidation Settlement

Hyperbolic Analysis Method

Asaoka Method

Terzaghi One-dimensional Analysis Method

연구목적: 실트질 함유가 높으며 다양한 응력이력 때문에 침하량 예측에 어려움이 있는 우리나라의 서해안 중부지역의 연약점토지반의 침하량 특성을 분석하기 위하여 실험을 실시하였다. 연구방법: 3개의 경우에 대한 현장실험을 실시하였다. 각각의 경우에 대하여 침하판 침하량을 계측하였으며 Terzaghi의 일차원 압밀침하량, 쌍곡선법(hyperbolic method)과 Asaoka법을 모두 분석하여 실무에 유용한 결론을 도출하였다. 연구결과: Terzaghi에 의한 예측값이 모든 경우에서 가장 큰 것으로 분석되었으며 침하판 침하값에 비하여 111%~187%로 크게 예측하였다. 즉, 실제 지반의 침하량인 침하판 침하값이 Terzaghi의 예측값에 비하여 53.4~89.9% 의 침하를 나타내었다. 따라서, 우리나라 중부 서해안 점토질 연약지반에서 Terzaghi방법에 의한 예상침하량은 실제 침하량보다 과다하게 예상하는 것으로 분석되었다. 결론: Asaoka방법과 쌍곡선 방법은 비교적 유사한 결과를 제시한 것으로 분석되었으며, 실무에서는 실제침하량 보다 작게 침하량을 예측할 경우 위험을 초래할 수 있으므로 실제 침하량보다 6~14% 크게 예측한 쌍곡선 분석법이 안전측으로 사용될 수 있을 것으로 판단된다.

키워드

연약지반

압밀침하

쌍곡선분석법

Asaoka분석법

Terzaghi일차원분석법

References

Asaoka, A. (1978). "Observational procedure of settlement prediction." Soils and Foundations, JSSMFE, Vol. 18, No. 4, pp. 87-101. 10.3208/sandf1972.18.4_87
Barron, R.A. (1948). "Consolidation of fine grained soils by drain wells transactions." American Society of Civil Engineers, Vol. 113. 10.1061/TACEAT.0006098
Chang, H.H., Choi, S.H., Yoon, B.J. (2016). "GHGs emissions based on individual vehicles speed." Journal of Korea Society of Disaster Information, Vol. 15, No. 4, pp. 560-569.
Chang, M.F. (1991). "Interpretation of over consolidation ratio from in situ tests in recent clay deposits in Singapore and Malaysia." Canadian Geotechnical Journal, Vol. 28, No. 2, pp. 210-225. 10.1139/t91-028
Dave, J.R., Senapathy, H., Murphy, W. (1994). Settlement Preditions using Piezocone. Vertical and Horizontal Deformation of Foundations and Embankments. ASCE GSP 40, New York, USA.
Hansbo, S. (1981). "Consolidation by vertical drains." Geotechnique, Vol. 31, No. 1, pp. 45-66. 10.1680/geot.1981.31.1.45
Hosino, T. (1962). "Problems of foundation in Recent Years." Society of Civil Engineering, Vol, 47, No. 7, pp. 124-131.
Mikasa, M. (1965). The consolidation of soft clay. Japan Society of Civil Engineer, Japan.
Onoue, A. (1988). "Consolidation by taking well resistance and smear into consolidation." Soil Sand Foundations 28, No. 4, pp. 165-174. 10.3208/sandf1972.28.4_165
Tan, T.S., Inoque, T., Lee, S.L. (1991). "Hyperbolic method for contributions analysis." Journal of Geotechnical Engineering, American Soicety of Civil Engineers, Vol. 117, No. 11, pp. 1723-1737. 10.1061/(ASCE)0733-9410(1991)117:11(1723)
Terzaghi, K. (1943). Theoretical Soil Mechanics. John Wiley & Sons, New York, USA. 10.1002/9780470172766
Yoon, B.J. (2016). "ITS System architecture based upon object-oriented methodology." Journal of Korea Society of Disaster Information, Vol. 12, No. 1, pp. 105-115. 10.15683/kosdi.2016.3.31.105

Information

Publisher :The Korean Society of Disaster Information
Publisher(Ko) :한국재난정보학회
Journal Title :Journal of the Society of Disaster Information
Journal Title(Ko) :한국재난정보학회논문집
Volume : 17
No :4
Pages :786-793
DOI :https://doi.org/10.15683/kosdi.2021.12.31.786

[1] Asaoka, A. (1978). "Observational procedure of settlement prediction." Soils and Foundations, JSSMFE, Vol. 18, No. 4, pp. 87-101. 10.3208/sandf1972.18.4_87

[2] Barron, R.A. (1948). "Consolidation of fine grained soils by drain wells transactions." American Society of Civil Engineers, Vol. 113. 10.1061/TACEAT.0006098

[3] Chang, H.H., Choi, S.H., Yoon, B.J. (2016). "GHGs emissions based on individual vehicles speed." Journal of Korea Society of Disaster Information, Vol. 15, No. 4, pp. 560-569.

[4] Chang, M.F. (1991). "Interpretation of over consolidation ratio from in situ tests in recent clay deposits in Singapore and Malaysia." Canadian Geotechnical Journal, Vol. 28, No. 2, pp. 210-225. 10.1139/t91-028

[5] Dave, J.R., Senapathy, H., Murphy, W. (1994). Settlement Preditions using Piezocone. Vertical and Horizontal Deformation of Foundations and Embankments. ASCE GSP 40, New York, USA.

[6] Hansbo, S. (1981). "Consolidation by vertical drains." Geotechnique, Vol. 31, No. 1, pp. 45-66. 10.1680/geot.1981.31.1.45

[7] Hosino, T. (1962). "Problems of foundation in Recent Years." Society of Civil Engineering, Vol, 47, No. 7, pp. 124-131.

[8] Mikasa, M. (1965). The consolidation of soft clay. Japan Society of Civil Engineer, Japan.

[9] Onoue, A. (1988). "Consolidation by taking well resistance and smear into consolidation." Soil Sand Foundations 28, No. 4, pp. 165-174. 10.3208/sandf1972.28.4_165

[10] Tan, T.S., Inoque, T., Lee, S.L. (1991). "Hyperbolic method for contributions analysis." Journal of Geotechnical Engineering, American Soicety of Civil Engineers, Vol. 117, No. 11, pp. 1723-1737. 10.1061/(ASCE)0733-9410(1991)117:11(1723)

[11] Terzaghi, K. (1943). Theoretical Soil Mechanics. John Wiley & Sons, New York, USA. 10.1002/9780470172766

[12] Yoon, B.J. (2016). "ITS System architecture based upon object-oriented methodology." Journal of Korea Society of Disaster Information, Vol. 12, No. 1, pp. 105-115. 10.15683/kosdi.2016.3.31.105

Journal of the Society of Disaster Information ISSN:1976-2208(Print) 2671-5287(Online) 한국재난정보학회논문집

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