Geological Problems Encountered and Solutions Implemented

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Presentation transcript:

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

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

Site Investigation Geology Boreholes Probing Seismic Surveys

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

Geology Geology

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)

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

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?