Stress-strain response analysis and protective device design for buried pipeline impacted by perilous rock

• Main Authors: Jie Zhang, Zheng Liang, Chengyu Xia
• Format: Article
• Language: English
• Published: JVE International 2016-08-01
• Series: Journal of Vibroengineering
• Subjects: buried pressure pipeline; perilous rock; FEM; stress and strain; protective device
• Online Access: https://www.jvejournals.com/article/16626

Collapse of perilous rocks is one of the most severe geological disasters for pipeline security. Stress-strain response of a buried pressure pipeline impacted by a perilous rock was simulated. Effects of impact velocity, rock’s radius, pipeline’s wall thickness, surrounding soil’s elastic modulus and Poisson’s ratio on stress, strain and deformation of the buried pipeline were investigated. The results show that the buried pipeline’s upper part is prone to instability under the rock impact. Plastic area of the buried pipeline becomes from oval to bat type with the impact load increases. Strain of the impact dent center is a compressive strain, while it is a tensile strain on the two sides of the dent. High stress area, axial strain and plastic strain of the buried pipeline increase with the increasing of impact velocity and rock’s radius, but they decrease with the increasing of wall thickness and soil’s elasticity modulus. Surrounding soil’s Poisson’s ratio has a small effect on the stress and strain of the pipeline. Impact dent’s size increases with the increasing of impact velocity and rock’s radius. Dent depth decreases with the surrounding soil’s elasticity modulus increases. With the wall thickness increases, impact dent depth first increases and then decreases. Finally, a protective device of buried pipeline is designed for preventing perilous rock impact. It can reduce the failure probability and improve the service life of buried pipeline for its simple structure and convenient installation.