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  Exploring planned tunnel alignment with directional core drilling

  Directional core drilling (DCD) affords design engineers accurate imaging of the geology along the tunnel’s trajectory. The collected core as well as the borehole can be examined and provide a verified account of the rock formation, recording position, dimension and properties of weakness zones, and geological anomalies. Before initiating a directional borehole, careful planning is needed. Parameters such as start direction, inclination and curvature radius are important to allow an efficient and comprehensive exploration of the area of interest. Equally important is the execution of the drilling process, requiring accurate surveying to maintain trajectory, and avoid the borehole from entering the planned tunnel area. Case studies and discussions regarding the methods advantages and limitations, affords the reader an opportunity to optimize the planning and execution of a directional borehole.

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