Province Geotechnical and Tunnels Manager Gautrain: Tunneling Challenges Site Investigations Carried Out by Province Ron Tluczek Province Geotechnical and Tunnels Manager 18 September 2009

Tunnel Route

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Geotechnical Investigation - Feasibility Study - Detailed Investigation

GEOTECHNICAL INVESTIGATION FOR THE GAUTRAIN RAPID RAIL LINK THE FEASIBILITY INVESTIGATION CONSISTED OF: 19 rotary core boreholes (tunnels, underground stations, portals, etc.) Seismic measurements at selected portal positions, geological contacts, underground stations Laboratory testing on rock samples, i.e. UCS, triaxial, tensile strength Joint surveys on available rock exposures Excavation of trial holes

GEOTECHNICAL INVESTIGATION FOR THE GAUTRAIN RAPID RAIL LINK THE DETAILED INVESTIGATION CONSISTED OF: 89 rotary core boreholes (tunnels, underground stations, portals, etc.) 120 large diameter auger holes and test pits (bridge, viaduct, culvert foundations and surface station and maintenance yard areas) 100 percussion holes (risk assessment of sinkholes in dolomitic areas) Gravimetric and electromagnetic surveys to determine depth and variability of bedrock, location and width / dip of contacts Geohydrological study to ascertain depth and quality of groundwater along the route Seismic events, historical record and future predictions Laboratory testing on soil samples, i.e. gradings, Atterberg limits, shear strength parameters, compaction parameters Laboratory testing on rock samples, i.e. UCS, triaxial, tensile strength, durability, boreability, abrasiveness, petrographic and XRD analysis

Geology

288m 1876m 3499m 460m 4137m 4725m 251m 193m

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Aeromagnetic Survey

Deliverables

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