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Relationer mellan grundvattenmagasin och geologiska strukturer i samband med tunnelborrning genom Hallandsås, Skåne

Mikkelsen, Angelica (2007) In Examensarbeten i geologi vid Lunds universitet
Department of Geology
Abstract (Swedish)
Vid tunnelbygget genom Hallandsås i nordvästra Skåne har man stött på tre större vittringszoner
och har periodvis haft problem med stort inflöde av vatten till tunnlarna. Detta vatten kommer från de ovan– och
omkringliggande akvifärerna och dräneringen registreras som sjunkande grundvattennivåer i kontrollbrunnar på
åsen. För att försöka skapa en bild av sprickakvifärernas utbredning i området ovanför borrmaskinen studerades tio
kontrollbrunnar i anslutning till Södra Randzonen, en av de större vittringszonerna. Grundvattennivåernas förändring
under tolv månader undersöktes. Även geologin i området undersöktes för att få ytterligare en variabel till utredningen.
De huvudsakliga bergarterna i området är gnejs, amfibolit och diabas med... (More)
Vid tunnelbygget genom Hallandsås i nordvästra Skåne har man stött på tre större vittringszoner
och har periodvis haft problem med stort inflöde av vatten till tunnlarna. Detta vatten kommer från de ovan– och
omkringliggande akvifärerna och dräneringen registreras som sjunkande grundvattennivåer i kontrollbrunnar på
åsen. För att försöka skapa en bild av sprickakvifärernas utbredning i området ovanför borrmaskinen studerades tio
kontrollbrunnar i anslutning till Södra Randzonen, en av de större vittringszonerna. Grundvattennivåernas förändring
under tolv månader undersöktes. Även geologin i området undersöktes för att få ytterligare en variabel till utredningen.
De huvudsakliga bergarterna i området är gnejs, amfibolit och diabas med varierande sprickfrekvens och
vittringsgrad. Efter dessa undersökningar har fem sprickakvifärer kunnat urskiljas. I ett par fall begränsas akvifärerna
av bergartsgränser, till exempel så utgör en diabas i den södra delen av området definitivt en akvifärgräns, precis
som en större amfibolitkropp. På grund av att geologin i området inte undersökts utanför tunnellinjen är det svårt att
avgöra huruvida så är fallet med alla akvifärgränser eller om de begränsas av till exempel vittringszoner. Akvifärerna
verkar vara till viss del sammankopplade men relationerna mellan dem är mycket komplexa och fler mätpunkter
hade behövts för att få en bättre bild av interaktionen mellan och utbredningen av dem. (Less)
Abstract
During the tunnel boring project through Hallandsås in the northwestern part of Skåne, large-scale
weathering zones have been encountered and there have periodically been problems with great amounts of water
leaking into the tunnels. This water comes from the above and surrounding aquifers and the drainage is registered
as sinking groundwater levels in control wells on the ridge. In an attempt to create a picture of the aquifer’s extension
in the area above the tunnel boring machine, ten control wells adjacent to the South Border Zone, one of the
weathering zones, were studied. The change in groundwater levels were studied for about twelve months. Also the
geology in the area was studied to add another variable to the investigation.... (More)
During the tunnel boring project through Hallandsås in the northwestern part of Skåne, large-scale
weathering zones have been encountered and there have periodically been problems with great amounts of water
leaking into the tunnels. This water comes from the above and surrounding aquifers and the drainage is registered
as sinking groundwater levels in control wells on the ridge. In an attempt to create a picture of the aquifer’s extension
in the area above the tunnel boring machine, ten control wells adjacent to the South Border Zone, one of the
weathering zones, were studied. The change in groundwater levels were studied for about twelve months. Also the
geology in the area was studied to add another variable to the investigation. The main rock types in the area are
gneiss, amphibolites and dolerite with varying crack frequency and degree of weathering. After these investigations,
five aquifers have been identified. In some cases the aquifers are limited by the limitations of different rock
types, for example a dolerite in the south part of the area definitely represents a boundary, as does a bigger amphibolite
body. Because the geology outside the tunnel has not been investigated is it hard to determine whether this is
the case with all the aquifer boundaries or if some of them maybe are limited by weathering zones. The aquifers
seem partly connected but the relations between them are complex and more control wells would have been necessary
to get a full picture of the interaction and relations between them. (Less)
Please use this url to cite or link to this publication:
author
Mikkelsen, Angelica
supervisor
organization
alternative title
Relations between ground water and geological structures in connection with a tunnel boring project through Hallandsås, Skåne
year
type
H1 - Master's Degree (One Year)
subject
keywords
Hallandsås, hydrogeologi, sprickakvifärer, grundvatten, hydrogeology, aquifers, ground water
publication/series
Examensarbeten i geologi vid Lunds universitet
report number
215
language
Swedish
additional info
Magnus Gynnemo och Jonny Sangkär, Banverket.
id
2335509
date added to LUP
2012-01-31 15:54:54
date last changed
2012-01-31 15:54:54
@misc{2335509,
  abstract     = {{During the tunnel boring project through Hallandsås in the northwestern part of Skåne, large-scale
weathering zones have been encountered and there have periodically been problems with great amounts of water
leaking into the tunnels. This water comes from the above and surrounding aquifers and the drainage is registered
as sinking groundwater levels in control wells on the ridge. In an attempt to create a picture of the aquifer’s extension
in the area above the tunnel boring machine, ten control wells adjacent to the South Border Zone, one of the
weathering zones, were studied. The change in groundwater levels were studied for about twelve months. Also the
geology in the area was studied to add another variable to the investigation. The main rock types in the area are
gneiss, amphibolites and dolerite with varying crack frequency and degree of weathering. After these investigations,
five aquifers have been identified. In some cases the aquifers are limited by the limitations of different rock
types, for example a dolerite in the south part of the area definitely represents a boundary, as does a bigger amphibolite
body. Because the geology outside the tunnel has not been investigated is it hard to determine whether this is
the case with all the aquifer boundaries or if some of them maybe are limited by weathering zones. The aquifers
seem partly connected but the relations between them are complex and more control wells would have been necessary
to get a full picture of the interaction and relations between them.}},
  author       = {{Mikkelsen, Angelica}},
  language     = {{swe}},
  note         = {{Student Paper}},
  series       = {{Examensarbeten i geologi vid Lunds universitet}},
  title        = {{Relationer mellan grundvattenmagasin och geologiska strukturer i samband med tunnelborrning genom Hallandsås, Skåne}},
  year         = {{2007}},
}