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A Swedish grouting design concept: Grouting with silica sol in the Nygård and Törnskog tunnels

Christian Butron (Institutionen för bygg- och miljöteknik, Geologi och geoteknik) ; Gunnar Gustafson (Institutionen för bygg- och miljöteknik, Geologi och geoteknik) ; Johan Funehag (Institutionen för bygg- och miljöteknik, Geologi och geoteknik)
Geotechnical Special Publication - Grouting and mixing 2012. Proceedings of the Fourth International Conference on Grouting and Deep Mixing New Orleans, Louisiana, United States February 15-18, 2012 (0895-0563). 228 GSP, p. 826-835. (2012)
[Konferensbidrag, refereegranskat]

The scope of this paper is to present two tunnel grouting design case studies where the waterproofing aimed not only to reduce the water inflow to a specified level, but to minimize the number of dripping spots by means of pre-excavation grouting. Every grouted section of around one hundred meters in both tunnels used relevant parameters from the rock and the grout material properties to develop an adequate, pre-excavation grouting design. Both tunnels, constructed in crystalline rock, used silica sol as the main grouting material and were evaluated later by means of control boreholes and dripping characterization. Control boreholes showed a decrease in the transmissivity in these sections, and the dripping characterization showed a reduction in the number of dripping spots compared to the rest of the tunnel, where this pre-excavation grouting concept was not used. This led to minimization of the number of drains used, which was clearly visible in the Nygård case, suggesting that the designs were successful and confirming that an understanding of the rock and grout properties is crucial to the design concept.

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Denna post skapades 2012-03-05. Senast ändrad 2016-04-29.
CPL Pubid: 155617


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