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Geological Problems Encountered and Solutions Implemented

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Presentation on theme: "Geological Problems Encountered and Solutions Implemented"— Presentation transcript:

1 Geological Problems Encountered and Solutions Implemented
THE CHANNEL TUNNEL Geological Problems Encountered and Solutions Implemented

2 Overview Contents of Presentation Description of tunnel Location
Introduction Contents of Presentation Description Geology Conditions Encountered Solutions End Result Description of tunnel Cost Length Duration of Construction Location

3 Site Investigation Geology Boreholes Probing Seismic Surveys

4 Geology Description of Geology Location of planned excavation
Upper Chalk (Coniacian layer) Middle Chalk (Turonian layer) Lower Chalk (Cenomanian layer) Gault Clay (Albian layer) Location of planned excavation Depth and layer Favourable properties

5 Geology Geology

6 Detailed Solutions Combination of measures implemented TBM design
Problems Combination of measures implemented TBM design resists 11 bar pressure Flexible hood controls broken ground Tunnel Lining Spheroidal graphite cast-iron lining (SGI)

7 Detailed Solutions Ground treatment Grouting from MST
Problems Ground treatment Grouting from MST Tube a Machete forces grout into rock Reduces permeability Eliminates water-bearing fissures

8 Summary Boring & probing establishes potential hazards
Chalk marl strata ideal Solutions in unfavourable conditions Importance of geology in civil engineering Thank you for listening - Any questions?


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