ABSTRACT
To upgrade the production and supply of district heating in Copenhagen it has been decided to move the current production from the two older plants Svanemølleværket and HC Ørestedsværket to the completely renovated block 1 at the Amager Power Plant
(Amagerværket). In order to minimise the disturbance at the surface in the Copenhagen city it was decided to place the pipelines in a tunnel (Figure 1). The tunnel starts with a straight 2.4 km long stretch between the access shaft at the Amager Power Plant and the shaft at Adelgade, turns about 56◦ northwards and continues in a straight 1.5 km long stretch to the end shaft at
Fredensgade. The tunnel is located at a depth between 25 and 38 m. The alignment is governed partly by the wish to excavate the tunnel primarily in the middle Copenhagen limestone and partly by minimum inclinations needed to deal with condensates in the steam pipes during operation. The heating tunnel passes below the future metro tunnel on the first stretch to the shaft at Adelgade. The geology along the alignment is characterized by quarternary layers of fill, clay and sand tills and melt water units down to depths between 14 and 18 m below the surface and Copenhagen limestone underneath (Knudsen et al. 1995, Hansen & Foged 2002, Jackson et al. 2004).
