All Issue

2024 Vol.23, Issue 2 Preview Page

Research Article

A Study on Back Analysis Settlement Prediction of Soft Ground Using Numerical Analysis and Measurement Data

수치해석과 계측데이터를 이용한 연약지반의 역해석 침하 예측에 관한 연구

Sangju Jeon1
,
Hyeok Seo2
,
Daehyeon Kim3*
전 상주1
,
서 혁2
,
김 대현3*
1Member, Graduate Student, Department of Civil Engineering, Chosun Univ., 309 Pilmun-daero, Dong-gu, Gwangju 61452, Republic of Korea
2Member, Postdoctoral Researcher, Department of Civil Engineering, Chosun Univ., 309 Pilmun-daero, Dong-gu, Gwangju 61452, Republic of Korea
3Member, Professor, Department of Civil Engineering, Chosun Univ., 309 Pilmun-daero, Dong-gu, Gwangju 61452, Republic of Korea
*Corresponding Author
30 June 2024. pp. 9-17
PDF XML Citation
Abstract

When constructing on soft ground, managing ground settlement and safety is crucial. However, there often exists a significant disparity between the actual behavior of the ground and the design plans. In this study, we aimed to compare and analyze the difference between the predicted settlement based on theoretical formulas and the measured settlement during construction, in order to predict settlement. For this purpose, we analyzed settlement data from 18 construction sites. The results indicated that the back analysis settlement values were similar to the measured settlement values, whereas the design settlement values were significantly higher compared to the measured settlement values. Specifically, the design settlement values were 1.2 to 1.4 times higher than those derived from back analysis using measured values. The RMSE analysis revealed a value of 0.6212m for the design settlement and 0.1697m for the back analysis settlement. The difference between the back analysis settlement and the measured settlement was more than 70% lower than the difference between the design settlement and the measured settlement. This indicates that the back analysis settlement values exhibit lower error rates compared to the design settlement values.

Keywords
Numerical analysis
Panel-type retaining wall
Stability review
Ground water level
Colluvial soil

연약지반의 성토나 구조물 축조할 때, 지반의 침하와 안전에 대한 관리가 중요하다. 하지만 실제 지반의 거동과 설계 계획과는 현저한 차이를 보일때가 많다. 본 연구에서는 연약지반 설계시 이론식에 의해 추정되는 설계침하량과 시공시 게측되는 계측침하량의 차이를 통한 침하량 예측을 통하여 그 결과를 비교,분석하고자 하였다. 집중공 18개소에 대한 침하량 분석결과, 역해석 침하량은 계측침하량과 유사한 결괏값을 확인하였으나, 설계침하량의 경우 계측침하량 대비 높은 침하량 값을 확인하였다. 설계침하량의 경우 계측값을 통해 도출된 역해석 침하량과 실내침하량 보다 1.2∼1.4배 이상 높은 값을 보였다. RMSE 분석결과, 설계침하량의 경우 0.6212m, 역해석침하량의 경우 0.1697m로 확인되었다. 역해석침하량과 계측침하량의 차이가 설계침하량과 계측침하량의 차이보다 70%이상 낮은 결과를 보였으며, 이는 역해석침하량 값이 설계침하량보다 더 낮은 오차율을 보인다는 것을 확인할 수 있다.

References
1

Ahn, D. G. (2006), The Study For a Prediction of Settlement on Soft Ground Using Back Analysis, Master Degree Thesis, Chonnam National University

2

Hwang, D. Y. (2017), Back-analysis of Consolidation Parameters of PVD-improved Ground, Ph. D. Thesis, Dong-A University.

3

Kim, C. S. (2005), A Study on back analysis of consolidation settlement of soft soil, Master Degree Thesis, Chonnam Naional University.

4

Lee, J. W. (2010), The Evaluation of Consolidation Characteristics of Compositely Sedimented Soft Clays using Back Analysis, Master Degree Thesis, Daejin University.

5

Lee, Y. S. (2020), Evaluation of Design Soil Parameters from Inverse Analysis, Master Degree Thesis, Hanyang University.

6

Lim, S. H., Kang, Y. M. and Lee, D. W. (1998), "Final Settlement Prediction Methods of Embankments on Soft Clay by Back Analysis", Korean Journal of Agricultural Science, Vol.12, pp.247-259.

7

Park, H. I., Kim, Y. T., Hwang, D. J. and Lee, S. R. (2006), "Prediction of Settlement of Vertical Drainage-Reinforced Soft Clay Ground using Back-Analysis", Journal of the Korean Society of Civil Engineers, Vol.26, No.4C, pp.229-238.

8

Park, K. H. (2013), A Study on the Estimation Method of Ground Load applied to Concrete Lining using Back Analysis, Master Degree Thesis, Hanyang University.

10.12652/Ksce.2013.33.5.1957
9

Song, C. H. (2022), Reverse Analysis of Subsidence Measurement on the Soft Ground Applied with PBD Method, Master Degree Thesis, Kyungnam University.

10

Terzaghi, K., Peck, R. B. (1967), "Soil Mechanics in Engineering Practice", 2nd Jhon Wiley and Sons, New York.

11

Yoo, S. H. (2016), A Study on the Settlement Prediction of the SCP Composite Ground using Back-Analysis, Ph. D. Thesis, Pusan National University.

Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 23
  • No :2
  • Pages :9-17
  • Received Date : 2024-04-11
  • Revised Date : 2024-04-17
  • Accepted Date : 2024-04-18
  • DOI :https://doi.org/10.12814/jkgss.2024.23.2.009
Journal Informaiton Journal of the Korean Geosynthetics Society Journal of the Korean Geosynthetics Society
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close