In the heart of Portugal, a groundbreaking technique is reshaping how we think about soil stabilization, particularly for the energy sector. A recent study published in Geotecnia, the Portuguese Journal of Geotechnical Engineering, details a novel approach to preventing surface erosion using biocementation. This method, which leverages biological agents to precipitate calcium carbonate, is being hailed as a sustainable alternative to traditional soil treatment methods.
The research, led by Rafaela Cardoso from the University of Lisbon’s CERIS/Department of Civil Engineering at the Instituto Superior Técnico, focuses on the application of biocementation to stabilize sandy soils. The technique was tested on a real-world slope along the A13 motorway, managed by BRISA. The treatment was carried out by Rodio Portuguesa, with Soletanche-Bachy supplying the necessary bacteria.
Biocementation works by introducing bacteria or enzymes into the soil, which then promote the formation of calcium carbonate. This process effectively binds the soil particles together, increasing resistance to erosion. “The results after a year of monitoring are very encouraging,” Cardoso explains. “We measured the amounts of calcium carbonate immediately after treatment and again after the first intense rainfall. The durability of the treatment is confirmed, making it a viable solution for preventing erosion.”
The implications for the energy sector are significant. Energy infrastructure, such as pipelines and power lines, often traverses challenging terrains where soil erosion can pose a substantial risk. Traditional methods of soil stabilization, such as chemical treatments or mechanical reinforcement, can be costly and environmentally damaging. Biocementation offers a more sustainable and potentially cost-effective alternative.
“The energy sector is always looking for ways to enhance the longevity and reliability of its infrastructure,” says a spokesperson from Soletanche-Bachy. “This biocementation technique could revolutionize how we approach soil stabilization, particularly in areas prone to erosion.”
The study, which marks the first case of biocementation in Portugal, has shown promising results in terms of durability and effectiveness. The treatment was able to withstand intense rainfall, demonstrating its potential for long-term use. “This is just the beginning,” Cardoso notes. “We hope that this research will pave the way for more widespread adoption of biocementation techniques, not just in Portugal but globally.”
As the energy sector continues to seek sustainable solutions, biocementation could play a crucial role in ensuring the stability and safety of infrastructure. The research published in Geotecnia (Geotechnical Engineering) provides a solid foundation for future developments in this field, offering a glimpse into a more sustainable and resilient future for soil stabilization.
