Abstract: The Luneng special railway project in Shanxi crosses many geomorphological units, such as, alluvial terraces from the south to the north, rolling hills and middlelow mountainous area. Among these areas, the focus is the investigations of an excessive largespan bridge and a tunnel. Comprehensive geotechnical investigations were performed using geological survey, field investigation, test borings, test pits geophysics (high density electrical resistance method), insitu testing, field pumping tests as well as laboratory testing on soil, rock and water samples. The design parameters were therefore determined and the surrounding rock mass for the tunnel was able to be categorized.

Key words: Railway Geotechnical Investigations, Excessive Large Span Bridge, Majianggou Tunnel, Special Soils, Comprehensive Investigations