KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지

A Study on the Dynamic Analysis of Buried Pipeline Subjected to Transverse Permanent Ground Deformation due to Liquefaction

액상화-횡방향 영구지반변형을 받는 지중매설관로의 동적 해석에 관한 연구

Kim, Moon-Kyum;Lim, Yun-Mook;Kim, Tae-Wook
김문겸;임윤묵;김태욱

  • Published : 2003.07.31

⟨ Previous Next ⟩

Abstract

In this study, a general numerical algorithm was developed for the dynamic analysis of a buried pipeline that was subjected to transverse permanent ground deformation (PGD). PGD is caused by liquefaction, which can result in the structural damage of buried pipeline. It is defined as the large-scale volumetric deformation of ground, caused by the excess pore water pressure (PWP) generated during ground excitation. Since there is so close a relationship between the generation of excess PWP and the decrease of soil stiffness, the decreasing functional form of soil stiffness in time was used in this study. Through this approach, the effect of liquefaction-induced PGD was considered in a numerical algorithm. The entire system composed of pipeline and surrounding soil is numerically modeled using the theory of beam on elastic foundation and finite element method. Stiffness, damping, and mass-related terms were appropriately considered in the system equation of motion. Likewise, the $Newmark-{\beta}$, method was used in performing time integration. To verify the developed algorithm, numerical results using the time history of Tokachi and East Chiba earthquakes were compared with the results of previous studies. In addition, relative influences of various parameters such as the characteristics of ground motion, the width of PGD, the coefficient of effective soil mass, and the decreasing function of soil stiffness were investigated.

본 연구에서는 액상화-횡영구지반변형을 받는 지중매설관로의 거동 특성을 해석하기 위하여 동적 수치해석 알고리즘이 개발되었다. 기존의 연구들이 정적 해석에 국한되거나 지반의 액상화 효과를 고려하지 못했던 반면, 본 연구에서는 과잉간극수압의 발생을 시간에 따른 지반강성의 감소현상과 연관시킴으로써 액상화-영구지반변형 효과를 반영하고 이에 따른 매설관로의 동적거동 특성을 규명하였다. 탄성지반 위에 지지되는 보 이론에 기초하여 영구지반변형이 발생한 지역에 위치한 연속된 매설관로를 해석대상으로 설정하였으며 전체 구조계의 운동방정식을 수립함에 있어서 지반의 질량은 유효지반질량을 이용하여 표현하였고, 시간에 따른 질량 및 감쇠특성의 변화를 반영하였다. 또한 수치해석기법 자체는 유한요소법과 뉴마크 직접적분법에 기초하여 구성하였다. 개발된 해석기법의 검증을 위해 실제 지진자료의 입력을 통한 기존 연구결과와의 비교가 이뤄졌으며 지진동 특성, 지반변형의 폭, 유효지반질량계수 및 지반강성함수 등을 변화 시켜가면서 다양한 해석을 수행하고 각 인자들의 영향정도를 평가하였다.

Keywords

References

  1. Empirical analysis of horizontal ground displacement generated by liquefaction-induced lateral spreads, Technical report NCEER-92-0021 Bartlett, S.F.;Youd, T.L.
  2. Proceedings of the second international conference on recent advances in geotechnical earthquake engineering and soil dynamics v.2 Byrne, P.M.
  3. Proceedings of the 1st International Conference on Earthquake Geotechnical Engineering Centrifuge modeling of liquefaction effects during earthquakes Dobry, R.;Taboada, V.;Liu, L.
  4. Soil Dynamics and Earthquake Engineering v.2 no.1 Analysis of Machine Foundation Vibrations: State of Art Gazetas, G.
  5. Journal of Geotechnical Engineering, ASCE v.113 no.5 Horizontal Damping of Arbitrary Shaped Embedded Foundations Gazetas, G.;Tassoulas, J.L.
  6. A consideration for the mechanism for liquefaction-related large ground displacement, Proceedings of the 5th U.S. Japan Workshop on Earthquake Resistant Design of Lifeline, Facilities and Countermeasures for Soil Liquefaction, NCEER Report 94-0026 Hamada, M.;Sato, H.;Kawakami, T.
  7. Study on Liquefaction induced permanent ground displacement, Report for the Association for the Development of Earthquake Prediction Hamada, M.;Yasuda, S.;Isoyama, R.;Emoto, K.
  8. Proceedings of Joint US Microzonation Workshop Dynamic Soil Properties Ishibashi, I.
  9. Soil Behavior in Earthquake Geotechnics Ishihara, K.
  10. Proceedings of 10th World Conference Experimental Study on Countermeasures for Liquefaction by Steel Piles with Drain Kita, H.;Iida, T.;Nishitani, M.
  11. Proceedings from the Second Japan-U.S. Workshop on Liquefaction, Large Ground Deformation and Their Effets on Lifeline Parametric Study on Flexibility of Buried Pipeline Subject to Large Ground Displacement, Technical Report NCEER-89-0032 Kobayashi, T.;Nakane, H.;Suzuki, N.;Ishikawa, M.
  12. Journal of Earthquake Engineering and Structural Dynamics v.26 Behavior of Continuous Pipeline Subject to Transverse PGD Liu, X.;O'Rourke, M.J.
  13. Proceedings of the Second National Conference on Soil Mechanics and Foundation Engineering Coefficient of Subgrade Reaction on Pile in Liquefied Ground Matsumoto, H.;Sasaki, Y.;Kondo, M.
  14. Displacements and Stresses Due to Nuclei of Strain in the Elastic Half-Space, Report of the Department of Civil Engineering and Engineering Mechanics, N.Y. Mindlin, R.D.
  15. Effects of Liquefaction-Induced Ground Movement on Pipeline, Proceedings from the Second Japan-Us. Workshop on Liquefaction. Large Ground Deformation and Their Effets on Lifeline, Technical Report NCEER-89-0032 Miyajima, M.;Kitaura, M.
  16. Response of Buried Pipelines subject to Earthquake Effects, MCEER Monograph No.3 O'Rourke, M.J.;Liu, X.
  17. Analysis Procedures for Buried Pipelines Subject to Longitudinal and Transverse Permanent Ground Defomtion, Proceedings from the Third Japan-U.S. Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasures for Soil Liquefaction. Technical Report NCEER-91-0001 O'Rourke, M.J.;Nordberg, G.
  18. Critical Aspects of Soil-Pipeline Interaction for Large Ground Deformation. Proceedings of the First Japan-US. Workshop on Liquefaction, Large Ground Deformation and Their Effects on Lifeline, Technical Report NCEER O'Rourke, T.D.
  19. Decade of Progress in Pressure Vessel Technology A State of the Art Review: Seismic Response of Buried Pipe lines O'Rourke, T.D.;Grigoriu, M.D.;Khater, M.M.
  20. Liquefaction Hazards and Their Effects on Buried Pipelines, Technical Report, NCEER89-0007 O'Rourke, T.D.;Lane, P.A.
  21. Proceedings of the US National Conference on Earthquake Engineering Seismic Soil-Structure Interaction of Buried Pipelines Parmelee, R.A.;Ludtke, C.A.
  22. EPOLLS: An empirical method for predicting surface displacement due to liquefaction-induced lateral spreading in earthquakes Rauch, A.F.
  23. Journal of Geotechnical Engineering Division, ASCE v.102 no.GT4 Pore-Water Pressure Changes During Soil Liquefaction Seed, H.B.;Martin, P.P.;Lysmer, J.
  24. Damage to Buried Pipes Caused by Large Ground Displacement, Proceedings of the First Japan-US. Workshop on Liquefaction, Large Ground Deformation and Their Effects on Lifeline, Technical Report NCEER Suzuki, H.
  25. Idealization of Permanent Ground Movement and Strain Estimation of Buried Pipes, Proceedings from the Third Japan-U.S. Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasures for Soil Liquefaction, Technical Report NCEER91-0001 Suzuki, N.;Matsuda, N.
  26. Proceedings of the Ninth Conference on Earthquake Engineering v.7 Estimation of Earthquake Induced Settlements for Lifeline Engineering Takada, S.;Tanabe, K.
  27. Proceedings of the Third International Conference on Soil Dynamics and Earthquake Engineering Liquefaction Analysis for Buried Pipelines Takada, S.;Tanabe, K.;Yamajyo, K.;Karugiri, S.
  28. Proceedings of the 7th International Symposium on Landslides v.2 A transient study on lateral flow on liquefied ground Towhata, I.;Toyota, H.;Vargas, W.M.
  29. Soils and Foundations Mathematical principles in prediction of lateral ground displacement induced by seismic liquefaction Towhata, I.;Orense, R.P.;Toyuta, H.
  30. Quasi-Static Seismic Analysis of Buried Straight Piping Systems, Report FSEL/NSF 83-01 Wang, L.R.L.;Olabimtan, A.
  31. Proceedings of IS-Nagoya, Pergamon Analysis of a progressive flow failure in an embankment of compacted fill Yashima, A.;Oka, E.;Konrad, J.M.;Uzuoka, R.;Taguchi, Y.
  32. Torsional shear and triaxial compression tests on deformation characteristics of sands before and after liquefaction, Proceedings of the 5th U.S.-Japan Workshop on Earthquake Resistant Design of Lifeline Facilities and Countermeasures Against Soil Liquefaction, Technical Report NCEER-94-0026 Yasuda, S.;Masuda, T.;Yoshida, N.;Kiku, H.;Itafuji, S.;Mine, K.;Sato, K.
  33. Proceedings of Tenth World Conference on Earthquake Engineering, NCEER 92 Several Simulations of Buried Pipelines During Liquefaction Yasuda, S.;Ono, T.;Kiku, H.
  34. Proceedings of the 19th JSCE Conference on Earthquake Engineering, JSCE Soil Spring Constant on Pile in Liquefied Ground Yasuda, S.;Saito, K.;Suzuki, N.
  35. Eleventh World Conference on Earthquake Engineering Initial Stress Effect on Response of Level Ground, Paper No. 102.3 Yoshida, N.
  36. Proceedings of the Fifth Japan Earthquake Engineering Symposium Dynamic Behavior of a Pile in Liquefaction Sand Yoshida, T.;Uematsu, M.
  37. Journal of Geotechnical Engineering Division, ASCE no.11 Mapping of Liquefaction Severity Index Youd, T.L.;Perkins, D.M.