신뢰성에 근거한 앵커 널말뚝의 설계방안 연구

The Use of Reliability-based Approach to Design Anchored Sheet Pile Walls

  • Kim, Hyung-Bae (Chief Researcher, Highway Research Institute, Korea Highway Corporation) ;
  • Lee, Seoung-Ho (Member, Professor, Dept. of Civil Engrg., Sangji Univ.)
  • 발행 : 2002.06.01

초록

본 연구에서는 앵커 널말뚝의 설계값 결정과정에 신뢰성이론을 적용한 설계방법을 제안하였다. 본 설계과정에서 먼저 말뚝의 근입깊이는 공학적으로 널리 사용되는 확률론적 수치계산방법에 따라 근입된 지반조건의 불확실성의 정도에 따라 결정되도록 하였다. 여기서 적용되는 확률론적 수치계산방법은 복잡한 계산과정이 필요하다거나 정확한 계산을 위해서는 지반강도 정수들에 대한 광범위한 통계적 분석이 별도로 필요하다든가 하는 번거로움없이 설계자가 간편하게 사용할 수 있다. 본 연구에서 제안된 설계법의 결과들은 일반적으로 널리 이용되는 다른 결정론적 설재법에 의한 결과들과 호응하는 것으로 나타났다. 본 연구에서는 아울러 널말뚝의 주요 설계입력변수들의 불확실성에 따른 설계결과의 영향을 분석하기 위한 민감도 조사가 실시되었다.

In this study, a reliability-based design (RBD) procedure for determining design values fur anchored sheet pile wall is proposed considering overturning about the anchor point as the major failure mode. In this design procedure, the depth of embedment of the sheet pile wall is logically chosen in accordance with degrees of uncertainties of design input parameters using approximate probabilistic computation methods. These methods have been successfully used in the geotechnical engineering requiring neither understandings of complex probabilistic theories nor efforts to prepare more data. It was investigated that the design results by the proposed method were compatible with those by commonly used deterministic design methods. Additionally, in an effort to investigate the effects of changes in the degree of uncertainties of major design variables on the design results of the sheet pile wall, a sensitivity analysis was peformed.

키워드

참고문헌

  1. Probability Concept in Engineering Planning and Design Volume Ⅰ and Ⅱ v.Ⅰ;Ⅱ Ang, A.;Tang, W.
  2. Canadian Geotechnical Journal v.29 The Reliability of an Anchored Sheet-pile Wall Embedded in a Cohesionless soil Cherubini, C.;Garrasi, A.;Petrolla, C. https://doi.org/10.1139/t92-047
  3. Principles of Foundation Engineering, ($3^{rd}$ Edition) Das, B. M.
  4. Journal of the Geotechnical and Geoenvironmental Engineering v.126 no.4 Factors of Safety and Reliability in Geotechnical Engineering Duncan, J. M. https://doi.org/10.1061/(ASCE)1090-0241(2000)126:4(307)
  5. Journal of the Geotechnical Engineering Division v.100 no.GT3 Probabilistic Analysis and Design of a Retaining Wall H$\"{o}$eg, K.;Murarka, R. P.
  6. Proceedings of Uncertainty in Geologic Environment: From Theory to Practice Engineering Judgment in the Evolution from Deterministic to Reliability-Based Foundation Design Kulhawy, F.;Phoon, K. K.
  7. Transportation Research Record 1546;Transportation Research Board Practical Reliability-Based Design Approach for Foundation Engineering Phoon, K. K.;Kulhawy, F. H.
  8. TRRL Report SR 813;Transport and Road Research Laboratory A Parametric Study of the Stability of Embedded Cantilever Retaining Walls Potts, D. M.;Burland, J. B.
  9. Point Estimates for Probability Moments, Proceedings v.72 Rusenblueth, E.
  10. Design Manual 7.2. Foundations and Earth Structures U.S Department of the NAVY
  11. A Technical Report prepared for U.S. Army Engineer Waterways Experiment Station Geotechnical Reliability of Dam and Levees Embankments Wolff, T. F.