Abstract: The geotechnical engineering in Karstic sinkholes area typically involves aspects of hydrogeology, engineering geology and environmental geology. A single conventional investigation method is difficult to solve these complex problems accurately and reliably. Based on the data collection, the means of geological mapping, geophysical exploration, drilling and other field as well as laboratory geotechnical tests are comprehensively applied to explore the evolutional characteristics, formation mechanism and development trend of sinkholes, and reveal the engineering hydrogeological conditions for construction giant elevators in the karstic sinkhole area. The results show that the development of sinkhole is closely related to lithology, tectonic structure, and groundwater conditions. The development of a sinkhole is relatively matured and in a stable period. The safety of the hazardous rock and slope stability can be minimized and mitigated. The comprehensive investigation provides a reliable technical support for a smooth progress of the project and can provide reference for similar projects in karstic sinkhole area and other karst areas.

Key words: Geotechnical Engineering Investigation, Comprehensive Investigation Method, Sinkhole Area, Application Research