Geotechnical Investigation by Directional Core Drilling

摘要

The need for development and improvements of infrastructure is always present, often including tunnels and other geotechnical constructions. Many of these tunnels are constructed in low quality ground conditions and often below rivers, lakes or cities. Such conditions give rise to complicated planning and difficult construction,rnwhile the consequences of mistakes can be severe. To reduce the risk of accidents thorough geotechnical investigation becomes necessary.rnA technique that is being used more and more for geotechnical investigation is directional core drilling. With directional control over a borehole, it is possible to drill along a defined trajectory, for instance a planned tunnel alignment, while collecting a core sample over the full borehole length.