Check and Monitoring of Condition of Concrete Slurry Wall, Jet-grouting and Frozen Soil Fences by Crosshole Sounding Method in Underground Construction

“Check and monitoring of condition of concrete slurry wall, jet-grouting and frozen soil fences by crosshole sounding method in underground construction” includes investigation results on the state of massifs of artificial soils established using a set of geophysical acoustic methods. Object of investigation are slurry wall panels' body and joints, jet-grouting and frozen soil underground fences. Methods of geophysical investigation are crosshole acoustic and ultrasonic sounding from holes or embedded tubes. For investigation use crosshole sounding apparatus APZ-1 developed by LLC “Geodiagnostika” and ultrasonic device Pulsar 2.2 DBS. The author postulates that non-destructive testing provides the most accurate information about the state of the enclosing structure in the place of manufacture in the underground space.