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New stabilisation method enables land development in Vietnam

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Ramboll Denmark
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Leading Finnish expertise in ground stabilisation has been leveraged in a pioneering project to test a new method in Hanoi, Vietnam. The project will help increase the availability of land suitable for development in the growing city.

- Hanoi is a growing city, and demand for development sites is high. The land area stabilised in the pilot project is located in central Hanoi. When previously unusable land is made suitable for development in a cost-efficient way, it increases the land value, says Tommi Marjamäki, Ramboll's development director for infrastructure.

Mass stabilisation is a technique for hardening soft ground. It eliminates the need to remove soft soils and the use of non-renewable natural resources as replacement material. The method is environmentally friendly, helps to reduce the carbon footprint of a construction project and brings significant savings.

No more need for lorries

Ramboll has been developing the method for over 20 years, but since the method was new to local operators, the pilot project was offered as an opportunity to see its effectiveness in practice. Ramboll experts developed and tested a range of alternatives, and changes in the properties of the stabilised soil mass were monitored by measurements.

- We stabilised a stretch of land 200 metres long. The site presented highly challenging ground conditions for construction. Previously, unsuitable soils had to be removed and transported out of the city by lorries, and the replacement material had to be hauled to the site. Now, the existing soft ground can be used instead, and endless lorry convoys are no longer necessary, Tommi Marjamäki explains.

Common standards to unlock potential

In Vietnam, ground stabilisation as a method is unknown to the extent that common standards for the technology don't yet exist. There are now plans to draw up the standards to facilitate wider use of the method.

- Once the standards are in place, the method can be utilised on a larger scale. In addition to Vietnam, other potential countries include Laos and Cambodia, says Tommi Marjamäki.