Numerical Investigation of the Method of Structural Performance and Rehabilitation of Large-Diameter Buried Steel Pipes Subjected to Excessive Deformation: A Case Study of China

다국어 초록 (Multilingual Abstract)

Large-diameter buried steel pipes (BSPs) play critical roles in water transport for major water diversion and hydropower projects. Due to poor pipe-soil composite system properties and installation conditions, they are prone to excessive deformation, resulting in safety hazards. This paper takes a BSP project subjected to excessive deformation as an example. A simplified numerical model is first established to analyze the structural performance, including the stress and plasticity, and the relationship between the stress and deformation of the pipe. Furthermore, a jacking method to rehabilitate the pipe-soil composite system is conducted to explore its influences on pipe deformation, stress, and plasticity. The results show that considerable bending stresses occur in the pipe and that sections of the midspan and stiffening ring are in the pure bending state and eccentric bending state, respectively. Areas of high stress and plasticity center at the crown, springline, and invert of the pipe, and steel pipes with ring deformation of 8.9% can be continued to be used, as the full yielding of the pipe walls occurs at the ring deformation of 15.8%. The jacking method is an effective solution for the rehabilitation of BSPs subjected to large deformation and can reduce pipe deformation significantly while increasing the stress at the pipe crown and the pipe plasticity only slightly.

참고문헌 (Reference)

1 AWWA, "Steel pipe: A guide for design and installation. AWWA Manual of Water Supply Practices M11"

2 Zheng J, "Steel pipe deformation control in Yamato Hydropower Station" 11 : 41-42, 2012

3 CECS, "Specification for structural design of buried steel pipeline of water supply and sewerage engineering. CECS 141: 2002"

4 Sivakumar Babu GL, "Reliability analysis of deflection of buried flexible pipes" 132 (132): 829-836, 2006

5 He-Gao Wu, "Pipe-Soil Interaction and Sensitivity Study of Large-Diameter Buried Steel Pipes" 대한토목학회 25 (25): 793-804, 2021

6 Alzabeebee S, "Innovative approach to determine the minimum wall thickness of flexible buried pipes" 15 (15): 755-767, 2018

7 BSI, "Guide to the structural design of buried pipes. BS 9295"

8 Kang J, "Finite element analysis for deeply buried concrete pipes in proposed imperfect trench installations with expanded polystyrene (EPS) foams" 189 : 286-295, 2019

9 Webb MC, "Field testing and buckling strength of buried large-diameter thin-walled steel pipes" 2002 : 2002

10 Kawabata T, "Field measurement and numerical analysis for buried large diameter steel pipes" 2008 : 1-10, 2008

11 Selçuk Bildik, "Experimental Investigation of Soil – Structure – Pipe Interaction" 대한토목학회 23 (23): 3753-3763, 2019

12 Dessouki AK, "Effect of soil failure on soil-steel structures" 112 (112): 522-536, 1986

13 Oswell JM, "Effect of geotechnical parameter variability on soil-pipeline interaction" 10 (10): 04019028-, 2019

14 Moser AP, "Deflection and strains in buried FRP pipes subjected to various installation conditions" 1008 : 109-116, 1985

15 Dezfooli MS, "Coupled nonlinear finiteelement analysis of soil–steel pipe structure interaction" 15 (15): 04014032-, 2015

16 Gozarchi SF, "Comparison of deflection measurement methods of large diameter steel pipes with control low strength material" University of Texas at Arlington 2014

17 Du J, "Cause analysis of large-diameter buried steel pipes and treatment methods" 35 : 157-158, 2015

18 Zhen L, "Analysis and remedial treatment of a steel pipe-jacking accident in complex underground environment" 59 : 210-219, 2014

19 Systèmes D, "Abaqus analysis user’s manual" Simulia Corp 2013