Analytical model for the strain analysis of continuous buried pipelines in geohazard areas

Abstract

In geohazard areas, buried pipelines are subjected to permanent ground-induced deformations, which constitute major threats for their structural safety. Geohazards include seismic fault movement, liquefaction-induced lateral spreading, slope instability or soil subsidence, and are associated with the development of severe strains in the pipeline. Calculation of these strains is necessary for assessing pipeline integrity. In the present paper, an analytical methodology is presented that allows for simple and efficient pipeline strain analysis in geohazard areas. The methodology is compared with existing more elaborate analytical methodologies and finite element predictions. The analytical formulation results in closed form expressions and the model contributes to better understanding of buried pipeline behavior subjected to permanent ground-induced deformations. The proposed methodology is directly applicable to fault actions, but it can be also applicable to a wide range of geohazards. Furthermore, using this methodology, one may predict the strains developed in the pipeline wall due to ground-induced actions in a simple and efficiently manner and is suitable for the preliminary design of pipelines.

Probabilistic Seismic Risk Analysis of Buried Pipelines Due to Permanent Ground Deformation for Victoria, BC

“…The finite element models were created in finite element analysis software ABAQUS [39]. References [2,[40][41][42][43][44][45][46][47][48][49][50] previously employed shell element pipes with surrounding continuum soil to analyze pipeline response undergoing fault rupture deformations. The computationally expensive HF model in the current study was based on this approach and follows the model in [31].…”

Behaviour of buried continuous pipelines crossing strike-slip faults: Experimental and numerical study

“…Furthermore, total curved length of the pipeline (2xLc) should be less than total length of the test set-up, which is 2 m, in order to avoid boundary effects on the bending behaviour of the pipeline. The length over which lateral displacement occurs due to curvature (Lc) is a function of lateral soil force per unit length (P u ), fault movement (δ) and pipe bending stiffness (EI) (Sarvanis and Karamanos, 2017). The pipe diameter (D), pipe wall thickness (t) and pipe burial depth (H) are selected considering both field kD 4 /EI values and the limit value of 2xLc.…”

Onshore Buried Steel Fuel Pipelines at Fault Crossings: A Review of Critical Analysis and Design Aspects

“…The structural health assessment of pipelines under faulting is carried out using analytical tools (e.g. Karamitros et al 2011;Sarvanis and Karamanos 2017;Talebi and Kiyono 2020), numerical modeling (e.g. Demirci et al 2018;Trifonov 2015;Vazouras et al 2015), and experimental testing (e.g.…”