Percussion drilling (shell ...

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Percussion drilling (shell and auger) is the most common drilling method used for geotechnical site or ground investigations. Depending upon access limitations and favorable ground conditions boreholes up to 100 m depth and up to 2 feet dia can be formed.

Percussion Drilling is usually known as cable percussion drilling.

Anyhow rotary can drill of any desired dia but the expensive machinery may not be available with your contractor.