Abstract: In recent years, high pressure jet grouting anchor support technology receives more applications in the deep excavation engineering in soft soils. This method, comparing with the with the traditional grouting ground anchor, has the advantage of higher axial capacity due to the improved grouted portion. However, the application in super lager foundation excavation in soft soils with a supporting depth of more than 15 meters is still rarely reported. This paper presents a case history of applying this method in a very large deep excavation system near Taihu Lake, Suzhou City.  The subsurface soil conditions at the project site have the characteristics of thick muck layer, highly compressible, and highly sensitive. During the jet grouted anchor installation, the inclination angle and length of the anchor were slightly adjusted and retension technique was used. The results were successful.

Key words: High Pressure Jet Grouted Anchor, Soft Soil Areas, Large Deep Excavations