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Volume Title: ICASGE2023

DOI: ICASGE-GEO

¹Navnit Kumar ; ²Olympa Baro; ¹Shiv Shankar Kumar; Shiv Shankar Kumar

¹National Institute of Technology (NIT) Patna

²National Institute of Technology (NIT) Silchar

Past studies found that earthquake-induced Permanent Ground Deformation (PGD) such as fault deformation as well as ground deformation in terms of liquefaction, lateral spreading, landslides and settlement, which significantly affect the buried pipelines. Many pipelines in India run through highly seismic-prone zones (IS1893:2016) and are exposed to considerable risk. For example, the oil and natural gas pipelines running through Northeast (NE) India are under severe risk since the entire Northeast region comes under one of the most seismically active regions in the world. Recently, a segment of a gas pipeline has been proposed to be laid across the North-Eastern region of India to supply the natural gas to the two important cities Guwahati city and Silchar town of Assam. Since, the entire NE region is in the seismic zone-v, the responses on the gas pipeline have been analyzed using ABAQUS, which is a finite element-based approach. For the analysis of buried pipeline, an incremental uniform displacement was applied to the soil model by considering strike-slip fault conditions and the response was observed in the form of strain developed in the buried-pipeline. The maximum strain in the buried pipeline was found to be 0.14 percent at a distance of 7.5 m with strike-slip fault displacement of 0.2 m. Similarly, the maximum strain in the buried pipeline was found to be 2.24 percent at a distance of 7.6 m strike-slip fault displacement of 3.0 m. It was noticed that the strain was maximum near the fault.

Buried Pipelines; Permanent Deformations; Strike-slip Fault; finite element method

Geotechnical Engineering (GEO)