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ATS QLD – Directional Drilling for Tunnel Investigation
ATS QLD – Directional Drilling for Tunnel Investigation
Please join The Australian Tunnelling Society (QLD Chapter) for a presentation on Directional Drilling for Tunnel Investigation, presented by Dr. Ian Gray, Managing Director of Sigra. In shallow tunnels with predominantly vertical variation in geology, vertical drilling is generally the most effective approach. However, when either the proposed alignment is deep, the surface inaccessible, or ...