Reviderad beräkningsmodell KC-pelare - möjligheter, TRV 2024/113470

Project name: Reviderad beräkningsmodell KC-pelare - möjligheter, TRV 2024/113470
Project leader: Stefan Larsson , Soil and Rock Mechanics, KTH
Participating Project Partners: Skanska Sverige AB
Project period: 2024-10-28 - 2025-12-31
Funding: Trafikverket

Stability ultimate limit state analyses for deep mixing with lime-cement columns have been performed since the
1970s with circular slip surface models that assume full interaction between the columns and the surrounding soil.
Today, completely different binders are used, such as cement and rest products from the industry, which provide
significantly higher strength, and then the condition of full interaction does not apply. Today, we want to
significantly reduce the climate footprint by utilizing higher strength and lower amounts of binders and new
climate-smart binders, and then most likely a new calculation model must be developed that can take into account
more critical failure mechanisms.
In this preliminary study, the development of stability analysis is compiled and critically discussed with the
supplementary instructions that have been added to guidelines over the years. In the preliminary study, a series of
advanced numerical 3D simulations are also carried out in parallel with analyses with the model used today for a
couple of typical cases, embankments, and excavated slopes. The analyses aim to assess the relevance of the current
calculation methodology relative to a significantly more advanced analysis and to be able to estimate the need for a
developed model for stability analyses. This is to be able to use higher strength, reduce binder contents, and use
alternative binders.

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