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

2. Tunnel Route

4. Main Bullet Point :
Sub-bullet

5. Geotechnical Investigation - Feasibility Study - Detailed Investigation

6. 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

7. 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

8. Geology

10. 288m
1876m
3499m
460m
4137m
4725m
251m
193m

11. Wireline Logging

13. Aeromagnetic Survey

18. Deliverables

28. Thank You www.gautrain.co.za 0800-Gautrain