Protecting critical pipelines during land movement
A cost-effective and practical method to protect pipelines and keep them operating during significant fault rupture incidents and large ground movements has been developed by Associate Professor Behzad Fatahi (Head of Geotechnical and Transportation Discipline) and his team.
Australia’s pipeline length of 50,000 km has a critical role in transporting water, gas and oil products, and transferring sewage to treatment plants.
Dr Fatahi and Habib Rasouli (PhD Candidate) at the School of Civil and Environmental Engineering report an advanced three-dimensional computer model to assess the mechanical performance of a pipeline protected by proposed polymer blocks under a strike-slip (horizontal) fault rupture.
While Australia is a relatively stable continental region with low to moderate magnitude earthquakes expected, Dr Fatahi explains that there are numerous active fault lines such as the Darling fault, extending over 1000 km in the west where most oil products - including 71% of crude oil and condensate - are produced.
Polymeric geofoam blocks as an inexpensive and light material can offer a safer and cost-effective solution to the challenges faced by Australia engineers passing pipelines through fault lines, increasing Australian competitiveness in international market as well as safety and reliability.
His findings prove pipes protected with geofoam blocks have a superior performance and remain operational under different strike-slip fault rupture scenarios, while the conventional buried pipelines suffer catastrophic damage. This proposed solution can save lives and reduce the potential environmental disaster due to content leakage.
“We can see how conventional pipelines buried in soil could be severely damaged under a strike-slip fault rupture due to excessive longitudinal compressive and tensile strains in the pipeline, or how the pipe section could be flattened due to bending of the pipeline,” he said.
The unacceptable performance of buried water mains, sewage network, and oil and gas pipelines could all lead to environmental disasters due to content leakage.