مجله ژئوفیزیک ایران

مجله ژئوفیزیک ایران

Soil–pipe interaction and p–y response of buried pipelines under normal faulting: a numerical study

مقالات آماده انتشار

نوع مقاله : مقاله پژوهشی‌

نویسندگان
Ali Reza Bagherieh 1
Seyed Mohammad Mahdi Mirazim 2
1 Assistant Professor, Department of Civil Engineering, School of Civil Engineering and Architecture, Malayer University, Malayer, Iran
2 M.Sc. in Structural Engineering, Department of Civil Engineering, School of Civil Engineering and Architecture, Malayer University, Malayer, Iran
10.30499/ijg.2025.538402.1720
چکیده
Buried pipelines are vital components of lifeline infrastructure, ensuring the safe and efficient transport of water, gas, and other essential resources. Earthquake-induced fault displacements, however, pose a significant threat to their structural integrity. Numerous numerical studies investigate soil–pipe interaction under fault movement. These approaches, while effective, often require high computational effort, such as modeling the pipeline with shell elements and representing the surrounding soil as a continuum. In practice, engineering analyses frequently adopt Winkler-type spring models to simulate the soil medium, but concerns remain regarding the suitability of this simplified representation and the assignment of p–y responses. To address these limitations, the present study adopts a moderately demanding yet efficient numerical approach. An HDPE pipe buried in sandy soil is subjected to normal faulting at a dip angle of 90°. The pipeline is modeled as a beam element embedded within continuum soil zones with interfacial contact, providing a balance between computational efficiency and modeling accuracy. Comparisons between numerical results and centrifuge test data demonstrate satisfactory agreement. The computed axial and bending strain distributions along the pipeline, as well as the p–y response, align well with centrifuge observations, whereas the ASCE (1984) guideline significantly overestimates the ultimate force and stiffness of the springs. Furthermore, parametric analyses varying design parameters such as burial depth, pipe diameter, and wall thickness show that the numerical trends are physically consistent and provide practical guidance for engineers in selecting optimal values.
کلیدواژه‌ها
Buried pipelines
FLAC3D
earthquake
faulting
high-density polyethylene

عنوان مقاله English

Soil–pipe interaction and p–y response of buried pipelines under normal faulting: a numerical study

نویسندگان English

Ali Reza Bagherieh 1
Seyed Mohammad Mahdi Mirazim 2
1 Assistant Professor, Department of Civil Engineering, School of Civil Engineering and Architecture, Malayer University, Malayer, Iran
2 M.Sc. in Structural Engineering, Department of Civil Engineering, School of Civil Engineering and Architecture, Malayer University, Malayer, Iran
چکیده English

Buried pipelines are vital components of lifeline infrastructure, ensuring the safe and efficient transport of water, gas, and other essential resources. Earthquake-induced fault displacements, however, pose a significant threat to their structural integrity. Numerous numerical studies investigate soil–pipe interaction under fault movement. These approaches, while effective, often require high computational effort, such as modeling the pipeline with shell elements and representing the surrounding soil as a continuum. In practice, engineering analyses frequently adopt Winkler-type spring models to simulate the soil medium, but concerns remain regarding the suitability of this simplified representation and the assignment of p–y responses. To address these limitations, the present study adopts a moderately demanding yet efficient numerical approach. An HDPE pipe buried in sandy soil is subjected to normal faulting at a dip angle of 90°. The pipeline is modeled as a beam element embedded within continuum soil zones with interfacial contact, providing a balance between computational efficiency and modeling accuracy. Comparisons between numerical results and centrifuge test data demonstrate satisfactory agreement. The computed axial and bending strain distributions along the pipeline, as well as the p–y response, align well with centrifuge observations, whereas the ASCE (1984) guideline significantly overestimates the ultimate force and stiffness of the springs. Furthermore, parametric analyses varying design parameters such as burial depth, pipe diameter, and wall thickness show that the numerical trends are physically consistent and provide practical guidance for engineers in selecting optimal values.

کلیدواژه‌ها English

Buried pipelines
FLAC3D
earthquake
faulting
high-density polyethylene
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