Numerical Investigation of Reverse Faulting Effect on the Response of Buried Pipes

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MONSHIZADEH NAEEN AMIN; Seyedi Housseininia Seyed Ehsan

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:2 Page(s): 233-244

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Title

Numerical Investigation of Reverse Faulting Effect on the Response of Buried Pipes

Author(s)

MONSHIZADEH NAEEN AMIN | Seyedi Housseininia Seyed Ehsan | Issue Writer Certificate

Keywords

Buried PipeQ1

Reverse FaultQ1

Numerical ModelQ2

ABAQUS SoftwareQ1

Pipe-Soil-InteractionQ1

Abstract

Pipelines are considered as lifelines, because they are used for transportation of different fluids such as natural gas, oil and water on which, the human life depends their existence. The damages to the pipelines are usually associated with human fatalities, financial losses and also environmental pollution. Earthquake wave propagation and permanent ground displacement (PGD) caused by surface faulting are potentially devastating natural events which threaten Buried Pipelines. Although small regions within the pipeline network are affected by faulting hazards, the rate of the damage is very high since fault movement imposes large deformation on pipelines. On the contrary, the whole of pipeline network is influenced by the wave propagation hazards, but the damage rate is lower which leads to lower pipe breaks and leaks per unit length of the pipe. On the other hand, Buried Pipelines due to their long length, have to pass through active faults which their large movements may lead to failure and rupture of the Buried Pipes. It is, therefore, essential to investigate the behavior of Buried Pipelines against fault displacements in order to mitigate the losses caused by these natural events and to try to keep them in service under various situations. Over the years, many researchers have attempted to analyze pipeline behavior via numerical, analytical an experimental modeling, but most of these works were designed to assess pipe response to strike-slip faulting and some were implemented to recognize the behavior of pipelines under normal faulting with right deformation angles. In the present study, In order to understand the behavior of the pipelines under Reverse Fault movements, the effects of different geotechnical and geometric conditions on the response of the pipes is examined. Numerical simulations have been conducted using the software ABAQUS based on finite element method. In most of the previous studies, a simplified beam-spring model was used to simulate the behavior of the pipes, but in this study a 3-D continuum model is employed to simulate the behavior of the Buried Pipes against Reverse Fault movements. In order to increase the accuracy of the analysis, it is tried to use the elements that the solution has best match with reality of the nature of soil and pipe behavior and the interaction between them. The results of the numerical study confirmed that the compressive strains in pipe caused by Reverse Faulting are larger than tensile strains, thus compressive strains are considered as the main cause of the failure of the Buried Pipes in the Reverse Fault motions. Investigating the pipes behavior in different soil types demonstrated that the Buried Pipelines in loose and soft soils experience less amount of strain in comparison with those bureid in other types of the soils. This is due to the fact that the displacement of the pipeline in loose and soft soils is easier and there is less soil resistance against pipe displacement. The assessment of the effect of soil dilatation angle illustrated that in large fault displacements, the amounts of pipe strain decline with the reduction in the dilation angle, while changing the modulus of elasticity of the soil has no impact on the response of the pipes. The results also showed that by reducing the burial depth, the level of strain induced in the Buried Pipes decreases.

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APA: Copy

MONSHIZADEH NAEEN, AMIN, & Seyedi Housseininia, Seyed Ehsan. (2018). Numerical Investigation of Reverse Faulting Effect on the Response of Buried Pipes. MODARES CIVIL ENGINEERING JOURNAL, 18(2 ), 233-244. SID. https://sid.ir/paper/256796/en

Vancouver: Copy

MONSHIZADEH NAEEN AMIN, Seyedi Housseininia Seyed Ehsan. Numerical Investigation of Reverse Faulting Effect on the Response of Buried Pipes. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(2 ):233-244. Available from: https://sid.ir/paper/256796/en

IEEE: Copy

AMIN MONSHIZADEH NAEEN, and Seyed Ehsan Seyedi Housseininia, “Numerical Investigation of Reverse Faulting Effect on the Response of Buried Pipes,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 2 , pp. 233–244, 2018, [Online]. Available: https://sid.ir/paper/256796/en

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