Project Client: City Tunnel projektet Contractor: MCG Bilfinger and Berger Per Aarsleff A/S Pihl og Søn A/S
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1 Project Client: City Tunnel projektet Contractor: MCG Bilfinger and Berger Per Aarsleff A/S Pihl og Søn A/S Slide 1
2 T conditions along alignments Level, meter Station Hyllie Clay till Holma Ramp Cut & cover I II Stadion gatan Station Triangeln Kung Oscars väg Groundwater level Level, meter Malmö Central III -50 Limestone Chalk -100 Transmissivity m /s 200 Transmissivity m /s km 0 Slide 2
3 Expected conditions in overview Level, meter Level, meter +30 Hyllie Concrete tunnel Portal Station Ramp Groundwater level in limestone, zone Zone 1 Quaternary Limestone Cross tunnel Zone Zon GT 67GM Chainage Track 71, meter Slide 3
4 Client and project requirements 1: Pumping of groundwater from pumping wells to lower groundwater in order to secure the open ramp against critical water pressures and upwards directed gradients. 2: Pumping of groundwater from pumping wells to reinfiltration wells to keep reinfiltration rate at 80 % or above. 3: The groundwater has to be pumped without aerating the groundwater in wells and pipelines. 4: The reinfiltration shall be executed and controlled in such a way that the reinfiltration wells are not exposed to excessive water pressures. 5: Management of permanent groundwater lowering system in order to keep waterlevel variations less than + 0,3 m at the control perimeter in relation to waterlevel variations in reference wells. Slide 4
5 Excavation. Design of intake West East Level Meter Infiltration well Pumping well 8 m Sheet pile wall Pumping well Infiltration well Level Meter ,5 +17, ,7 Excavation +12,7 Clay till ,5 +9, m in limestone Lowered groundwater level Well loss 5 m screening Track 74 Stat ,6 27,5 m Track 71 Stat ,2 10 m below excavation 10 m in limestone Limestone Slide 5
6 Contrlperimeter Slide 6
7 Basis for depth of reinfiltration wells Slide 7
8 Site investigations - Flowzones Holma. Concrete tunnel and ramp Flowlogs Slide Borehole number Casing = top inflow Top inflow Bottom inflow Inflow depth below limestone surface
9 Size of area Slide 9
10 Amounts of cables Slide 10
11 NGM Malmø Citytunnel. Holma MCG Air photo oct Slide 11
12 PCL photo autumn 2005 Lowering insufficient Slide 12
13 Expected yield 140. Legal yield 230 Holma. Water balance. Pumping, reinfiltration and reinfiltration rate Disharge to Bunkeflo Tot. Pu. yield. 2y-ax Reinfiltration ring 1 Reinfiltration ring 2 Tot.reinf. yield (2.y-axis) Reinfiltration rate 1,20 1, ,80 Water yield (m3/hour) ,60 0, , Date ,00 Slide 13
14 Task force Client: Michael M. Task force Contractor: Martin F. Slide 14
15 05.TU Zone 2A Malmø Citytunnel. Holma Mapping the zone 2B. 20 pumping wells to 45 pumping wells Flowlog results Vertical section along track TU TU TU TV TU TU TU TV TU TU TU TV TU TV TU TU TU TU PU PU PU TU PU PU.5004 Track Track TV TU TV TU TV TU TU TU TU TU TV TU TU TU TV TU TU TU PU PU PU PU PU PU TU TV TU.5013 Level, meter Concrete tunnels Portal Level, meter +30 Ramp TU TU TU TU TU TU TU Quaternary Groundwater level in limestone before lowering, zone 1 TOR GWL in monitoring wells Zone Deepest excavation level Deepest groundwater lowering level GWL in pumping wells ,1-3,7-4,0-3,5-5 -5,2 +0 Limestone Zone 2B NGM Chainage København track 74, meter, shown for track 71 Flowlog profile. The box around the flowlog shows the interval over which the vertical flow in the well has been measured. The width of the box corresponds to the pumping yield, i.e. 100% flow Slide 15 Holma. Longitudinal s Flowlogs. Wes LMM/JAN E l B
16 NGM Malmø Citytunnel. Holma Slide 16
17 NGM Malmø Citytunnel. Holma Basis and extension of system Slide 17
18 NGM Malmø Citytunnel. Holma Reference wells Slide 18
19 NGM Malmø Citytunnel. Holma Control wells. Each dot is a result of app. 700 scans. Slide 19
20 Response and period for acidtreatments Holma. Reinfiltration Water yields. SE 05.PI PI PI PI PI PI PI PI.5518 Reinfiltration SE Yield (m3/hour) Date Slide 20
21 Malmø Citytunnel. Holma Winter 2005/2006. Final excavation is dry but missing surface dewatering. Casting has started. Zone 2B Slide 21
22 NGM Malmø Citytunnel. Holma Slide 22
23 Problems during O&M Slide 23
24 NGM Malmø Citytunnel. Holma Breakthrough at Triangeln Thanks for your attention! Slide 24
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