Mechanical Assessment of Crushed Rocks Derived from Tunnelling Operations

Conference paper
Part of the Sustainable Civil Infrastructures book series (SUCI)


The Norwegian Public Roads Administration is currently running the “Ferry-free coastal route E39” project, which reduces the travel time along the Norwegian coast from Trondheim to Kristiansand. The plan includes the creation of several long tunnels, which will generate a surplus of blasted rocks; these could be used in the road unbound layers close to the place of production. The research presented here has three goals. The first aim is to map the geology encountered along the E39 road alignment. The second aim is to check whether the rocks fulfil the existing code requirements for road unbound layers, defined in terms of Los Angeles and micro-Deval limit values. The third aim is to investigate the crushing and the variation in grain size of the unbound materials during both construction phase and service life phase. The construction stage is achieved by a full scale testing to assess rock soundness after rolling, the service life stage is simulated by the repetition of a specific load in the triaxial cell apparatus. The current tunnelling operations located south of Bergen are producing blasted rocks, they adequately represent the geology spread along the entire E39 alignment. Three types of crushed rocks are selected and tested. The major part of the rocks excavated are suitable for direct use in pavement unbound layers. The most significant modification in grain size distribution curve takes place during the compaction phase for all the materials.


Crushed Rock Norwegian Public Roads Administration (NPRA) Unbound Pavement Layers Grain Size Distribution Curve Geology Spread 
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Copyright information

© Springer International Publishing AG, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Civil and Environmental EngineeringNTNUTrondheimNorway
  2. 2.Department of Geosciences and PetroleumNTNUTrondheimNorway

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