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Three Dimensional Dynamic Response of Buried Pipielines Due to Earthquake Induced Landslides by Numerical Modeling

Sahragard Jouneghani, Faranak | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52704 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jafarzadeh, Fardin
  7. Abstract:
  8. The purpose of this research is to study the effect of using expanded polystyrene (EPS) Geofoam to retrofit buried pipelines in slopes subjected to landslide due to earthquakes.For this purpose, several 3D numerical models were built with ABAQUS/CAE based on physical model tests conducted on shaking table device at Sharif University of Technology by previous research groups. Two parts are considered in this study. in the first part, three tests were simulated. Displacements, acceleration time histories and strains of pipes were compared to the tests results and the effect od EPS block on each pipe pesponse was observed. In the second part, effect of two factors on response of buried pipes was investigated: 1) EPS blocks position relative to pipes and 2) width of EPS blocks. For numerical modeling, the experiment box was modeled as a rigid body. For soil behavior, strain dependent nonlinear elasticity and Mohr-Coulomb criterion was employed. As in the tests, Aluminium pipes with external diameter of 16mm and thickness of 1mm with elasto-plastic behaviour was considered. For soil-pipe interaction, friction ratio of 0.5 in tangential direction and hard contact in normal direction was assumed. EPS blocks with elastic modulus of 600Pa and density of 8kg/m3 were used adjacent to pipes.Results showed that the critical zone for pipes is the upper half of slope and the safest zone is the toe of slope. Placement of EPS blocks behind the pipes, reduced their bending strains. Less effect was observed for the ones placed on top and in front of pipes. In addition increasing EPS block width, decreased bending strains of pipes in a descending rate
  9. Keywords:
  10. Buried Pipline ; Numerical Modeling ; Seismic Retrofit ; Dynamic Loading ; Landslide ; Soil-Pipe Interaction ; ABAQUS Software

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