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  Directional Drilling for Tunnel Investigation and Associated Testing Techniques

  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 drill string mechanics and drilling hydraulics are considered. The latter is frequently the limitation in shallower boreholes.

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