Terrasstabilisering: kunskapsdokument

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Gunilla Franzén
Per Lindh
Helen Åhnberg

In situ stabilisation of sub-grade is a method used in order to improve the bearing capacity in foundations on fine-grained soils with low bearing capacity. The method is applied in order to improve the bearing capacity for, for example, temporary roads during construction, but mainly for optimizing the pavement of the final road. The method is commonly used outside of Sweden and has proved to give well-functioning constructions.

The aim of the study has been to compile existing knowledge of the possibilities and limitations of the method to create opportunities for an increased use. The document deals with in situ stabilisation of existing fine-grained soil. Stabilization of the unbound layers in the road construction itself is not included in the study. Since the main purpose has been to study the method itself, the focus has been on traditional binders such as lime, concrete and slag. Some of the findings:

  • In order to use the full potential of the method it is necessary to further develop execution practice and requirements.
  • •The financial advantages of the method are mainly notable considering the life-cycle costs instead of investment costs.
  • •Under certain circumstances, the method has a potential to contribute to energy efficiency.

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