List of products by author: I. Gray

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  Directional Drilling for Tunnel Investigation and Associated Testing Techniques

  Abstract: This paper examines the suitable directional drilling options available for tunnel site investigations. It examines the different drilling methods, borehole survey systems and testing that may be conducted within the hole for lithology, ground fluid and geomechanical parameters. The use of open hole drilling coupled with suitable borehole geophysics is compared with core drilling. The issues of...

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