DOI QR코드

DOI QR Code

A Study on the Displacement Behavior according to the Analysis Model of Ground Excavation

지반굴착 해석모델에 따른 변위거동에 관한 연구

  • Received : 2018.02.05
  • Accepted : 2018.03.08
  • Published : 2018.04.01

Abstract

There were many ground excavation projects from past to present to make effective use of the limited land. And it is very important to predict the ground behavior depending on construction stage for ground excavation. Excavation of the ground involves changes in the stress and displacement of the ground around the excavated surface. Thus it affects the stability of the adjacent structure as well as the excavated surface. Therefore, it is very important to predict the ground behavior and stability of adjacent structure. And nowadays, numerical analysis methods are most often used to predict the effects of ground excavation. Recent, improvements of numerical analysis programs, along with improved computer performance, have helped solve complicated ground problems. However, except some specialized numerical analysis, most numerical analysis often predicts larger excavation floor displacement than field data due to adopt the Mohr-Coulomb analysis model. As a result, it raise the problem that increasing the amount of support on ground and structure. In this study, ground behavior analysis depending on analysis model (Mohr-Coulomb, Duncan-Chang, Modified Mohr-Coulomb and Hardening Soil model) has been carried out through the numerical analysis. When numerical analysis is carried out, this study is expected to be used as a basic data for adopting a suitable analysis model in various ground excavation project.

제한된 토지의 효율적인 활용을 위해 과거로부터 지하공간 개발에 따라 수많은 지반굴착 공사가 이루어져 왔다. 지반굴착은 굴착면 주변지반의 응력변화와 변위를 수반함에 따라 굴착면의 안정성에 영향을 미치게 되어 지반거동에 대한 영향을 예측하는 것이 매우 중요한 문제이다. 이러한 영향 예측을 위한 방법으로 수치해석방법이 주로 이용되며, 최근 컴퓨터 성능 향상과 더불어 수치해석 프로그램의 발달로 매우 복잡한 문제도 적용이 가능해졌다. 그러나 일부 특수해석을 제외하고 대부분 해석모델을 산정 및 적용이 간편한 Mohr-Coulomb 해석모델을 적용함에 따라 굴착면 바닥부에서 실제보다 큰 변위가 발생하는 것으로 예측되어 필요 이상의 보강이 이루어지는 문제점이 발생한다. 본 연구에서는 지반굴착 과정을 모사하여 수치해석을 수행하였으며, 해석모델로 Mohr-Coulomb, Modified Mohr-Coulomb, Duncan-Chang, Hardening Soil 해석모델을 적용하여 그 결과를 비교분석하였다. 본 연구는 수치해석을 통한 지반굴착 문제해결 시 다양한 지반굴착 조건별로 적합한 해석모델 선정을 위한 기초자료로 활용될 것으로 기대된다.

Keywords

References

  1. Abdel-Fattah, T. T., Abdel-Rahman, A. M. and Hodhod, H. A. (2005), "Applicability of elastoplastic modelling for simulating tunnel excavation in lightly overconsolidated clay", Proceedings of the Tenth International Conference on Civil, Structural and Environmental Engineering Computing, B.H.V.Topping (Editor), Scotland, pp. 657-658.
  2. Ardakani, A., Bayat, M. and Javanmard, M. (2014), "Numerical modeling of soil nail walls considering Mohr Coulomb, hardening soil and hardening soil with small-strain stiffness effect models", Geomechanics & Engineering, Vol. 6, No. 4, pp. 391-401. https://doi.org/10.12989/gae.2014.6.4.391
  3. Brinkgreve, R., Broere, W., Waterman, D. and Plaxis2D. (2015), "Reference and materials model manual", Eds., Amsterdam, Netherlands:PLaxis BV.
  4. Chung, J. S., Ahn, G. C., Shin, Y. W., Kim, G. S. and Jeong, J. H. (2017), "00Line 0zone a study on the stability of the existing line 0 connection structure by construction", Korean Tunnelling and Underground Space Association (In Korean).
  5. Duncan, J. M. and Chang, C. Y. (1970), "Nonlinear analysis of stress and strain in soils", Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 96, No. SM5, pp. 1629-1653.
  6. Kim, D. K. (2006), "Study on Mohr-Coulomb and Duncan-Chang models in tunnel analysis", Korea Academy Industrial Cooperation Society, Vol. 7, No. 3, pp. 414-419 (In Korean).
  7. Likitlersuang, S., Surarak, C., Balasubramania, A., Oh, E., Syeung, R. K. and Wanatowski, D. (2013), "Duncan-Chang-Parameters for hyperbolic stress strain behaviour of soft Bangkok clay", Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, pp. 381-384.
  8. Mitesh, C. and Aliki, K. (2016), "Design of the deep cut and cover crossrail paddington station using finite element method", Crossrail learning legacy.
  9. Schanz, T., Vermeer, P. A. and Bonnier, P. G. (1999), "The hardening soil model : Formulation and verification", Beyond 2000 in computational geotechnics, pp. 281-296.

Cited by

  1. 다짐 풍화토의 Duncan & Chang 모델 매개변수-초기접선계수와 극한축차응력 산정에 관한 연구 vol.19, pp.12, 2018, https://doi.org/10.14481/jkges.2018.19.12.47