Numerical simulation of pipeline deformation caused by rockfall impact

Area of Science:

• Engineering
• Geotechnical Engineering
• Materials Science

Background:

• Rockfall impacts represent a critical hazard to the integrity of oil and gas pipeline transportation systems.
• Understanding pipeline deformation under various impact scenarios is essential for mitigating risks.

Purpose of the Study:

• To investigate the deformation of oil and gas pipelines subjected to diverse rockfall impact conditions using numerical simulations.
• To analyze the influence of rock shape (spherical vs. cube), impact angle, and eccentricity on pipeline plastic strain and potential rupture.

Main Methods:

• Finite element method (FEM) simulations were employed to model rockfall-pipeline interactions.
• Pipeline deformations were analyzed under radial, longitudinal inclined, transverse inclined, and lateral eccentric impact scenarios.
• The effects of impact angle and eccentricity on plastic strain were systematically evaluated for both spherical and cube rockfalls.

Main Results:

• Spherical rockfalls create deeper craters than cube rockfalls of equivalent volume.
• Maximum plastic strain for spherical rockfalls occurs at a 45° impact angle; cube rockfalls pose a rupture risk at smaller angles.
• Increasing impact angle leads to more uneven plastic strain distribution, while increasing eccentricity reduces the plastic strain zone.

Conclusions:

• Pipeline rupture risk is significantly influenced by rockfall characteristics and impact dynamics.
• Impact angle and eccentricity are critical parameters affecting pipeline integrity under rockfall loading.
• These findings provide valuable insights for designing more resilient oil and gas pipeline infrastructure against rockfall hazards.