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Analytical Analysis and Numerical Simulation of Released Shock Waves on Buried Gas Pipelines

Azadi, Amin | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50097 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan
  7. Abstract:
  8. Underground gas pipelines are one of the vital parts of each country which surface blasts can break them down, make destructive explosions and threaten the safety of neighborhood structures and people. In this paper, to enhance the safety of these lines, response of buried 56 inch high pressure gas pipeline to a surface blast is numerically investigated. Beside the main aim, parametric studies on the effects of: i) explosive mass, ii) pipeline thickness, iii) burial depth and iv) concrete protective layer, on pipeline deformation are performed. To simulate the problem according to actual explosion events, geometries are modeled in real scales, pipeline properties are predicted with Johnson-Cook strength and failure model and soil strength is determined by Drucker-Prager model. Also, explosive charge and natural gas are modeled with JWL and ideal gas equation of states. For validation of the numerical method, three bench mark experiments were reproduced which comparison of the numerical results and the experimental data confirmed the accuracy of numerical method. Results of parametric studies indicated that by increasing the burial depth from 1.4 to 2.2 m, deformation of the pipeline reduces about 71 percent. By analyzing the deformation plots, it could be found that in a constant explosive mass, burial depth has a greater effect on pipeline deformation reduction than pipeline thickness. It was also shown that using concrete protective layer may act reversely and increase pipeline destruction. In other words, to enhance the safety of pipelines, a certain thickness of concrete must be used
  9. Keywords:
  10. Buried Pipline ; Safety Distance ; Detonation Wave ; Blast Effect ; Surface Explosion

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