Stockholm City Line (Citybanan)

Pro­ject and ob­jec­ti­ves

The Stockholm Ci­ty Li­ne is one of Swe­den’s lar­gest con­struc­tion pro­jects. It in­vol­ves buil­ding a 6-kilo­met­re-long tun­nel for com­mu­ter trains un­der the cen­t­re of Stockholm. The li­ne be­gins at Stockholm Söd­ra sta­tion and ends at Tom­te­bo­da. Two new com­mu­ter sta­tions will be built on the li­ne: Ci­ty sta­tion and Oden­plan sta­tion. The pro­ject al­so in­clu­des a ser­vi­ce tun­nel which runs pa­ral­lel to the rail tun­nel and se­ven ac­cess and work tun­nels. Con­struc­ting tun­nels ten to for­ty met­res be­low ground le­vel in Stockholm ci­ty cen­t­re is a highly com­plex task, which requi­res the ab­i­li­ty to mo­ni­tor ca­re­ful­ly the ef­fect of the ground­wa­ter tab­le du­ring and af­ter the con­struc­tion pha­se.

De­scrip­tion

Ge­o­sig­ma’s ro­le in­vol­ves te­ch­ni­cal re­s­pon­si­bi­li­ty for the ge­ohydro­lo­gi­cal aspects of the pro­ject. We are re­s­pon­sib­le for ma­na­ging and co­or­di­na­ting tho­se parts of the pro­ject which re­la­te to ground­wa­ter is­sues. The ob­jec­ti­ve is to pre­vent sub­si­den­ce in the structu­res cau­sed by chang­es in the ground­wa­ter.