| BACKGROUND |
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| The creation of the Clem7 Tunnel brought a landmark piece of infrastructure to Queensland - it is the longest road tunnel in Australia providing a dual road tunnel under Brisbane from north to south around the central business district. The twin tunnels stretch a distance of 4.8km and reach to a depth of up to 60m below the Brisbane River. |
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| WHAT WE DID |
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| This $2 billion design and build scheme required extensive geotechnical core drilling in order for the engineers to gain essential knowledge of the ground conditions along the proposed route. |
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| Client | Brisbane City Council for initial feasibility study, Golder Associates for final design |
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| Duration | Eight months of work completed over a two year period |
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| Location | Overwater and land drilling in the following locations: |
| • | With BCC controlled roadways; |
| • | River Drilling, controlled by Brisbane Harbour Master, requiring special permission; |
| • | Private land, requiring access; |
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| Drilling | Due to the diverse geological condition along the proposed route, we were confronted with various challenges, these included: |
| • | Over water drilling in the Brisbane River |
| • | Angel holes to intercept two geological units in the same borehole |
| • | Night works due too traffic and site restrictions |
| • | Grout backfilling of borehole on alignment; |
| • | Complex geotechnical engineering insitu rock testing; |
| • | Installation of Geotechnical Instrumentation |
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| OUTCOME |
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| "Schneider Drilling was able to deploy two to three drilling rigs on various sites along the proposed tunnel route. This was of great benefit, as it allowed for the timely delivery of the initial feasibility study for this project. Both machines and personnel supplied by Schneider Drilling was of a quality that was unsurpassed." |
| Gary Bruyeres | Brisbane City Council, Senior Engineer |
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