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RISK ASSESSMENT FCC

RISK ASSESSMENT FCC. draft, 2. September 2015. risk assessment in an early stage of the project. what do we know general ground conditions composition of the rock mass orientation of the rock layers discontinuities in the different rocks (fault zones, karst…)

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RISK ASSESSMENT FCC

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  1. RISK ASSESSMENT FCC draft, 2. September 2015

  2. risk assessment FCC (draft 02.09.2015) risk assessment in an early stage of the project • what do we know • general ground conditions • composition of the rock mass • orientation of the rock layers • discontinuities in the different rocks (fault zones, karst…) • existence and level of the groundwater

  3. risk assessment FCC (draft 02.09.2015) risk assessment in an early stage of the project • what do we know • possible construction methods • pile and diaphragm walls for shafting • shaft sinking machines • machine supported excavation and rock safety measures in soft and hard rocks • conventional rock blasting with adequate rock safety measures • tunnel boring machines in soft and hard rocks with rock safety measures or segment lining

  4. risk assessment FCC (draft 02.09.2015) risk assessment in an early stage of the project • what do we know • advantages and limits of the construction method • excavation tolerance • bearable groundwater pressure on tunnel lining • value of rock strength limiting mechanical excavation methods • value of rock strength requiring additional rock safety measures • improving methods to stabilize fault zones • adoptable construction methods and rock safety measures in squeezing rock • treatment of water bearing rock and fault zones • unpredictability of karst structures in limestone

  5. risk assessment FCC (draft 02.09.2015) ) construction methods

  6. risk assessment FCC (draft 02.09.2015) risks in Molasse Access Shafts

  7. risk assessment FCC (draft 02.09.2015) construction methods

  8. risk assessment FCC (draft 02.09.2015) construction methods

  9. risk assessment FCC (draft 02.09.2015) Experimental Tunnel risks in Limestone / Urgonian / Prealps

  10. risk assessment FCC (draft 02.09.2015) risk assessment in an early stage of the project • what is next • create general geological longitudinal profiles for each relevant geological zoneMoraine: e.g. groundwater level + boulders Molasse: e.g. clay stoneUrgonian: e.g. karst all rocks: fault zones high water ingress hydrocarbon (gas)

  11. risk assessment FCC (draft 02.09.2015) risk assesment in an early stage of the project • what is next • define relevant geotechnical data of soil/rock for each relevant geological zone in connection with the local situation (e.g. overburden, building density, ….)

  12. risk assessment FCC (draft 02.09.2015) risk assessment in an early stage of the project • what is next • verify applicability of above proposed construction methods based on the compiled geological/geotechnical data (e.g. in squeezing rock) • assess best applicable construction method for each construction element (shafts/experimental halls/experimental tunnels) add necessary additional measurements and estimate the remaining risk • search for exceptional measurements to allow excavation in case of remaining risk in special occasions or emergencies

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