Application of Geophysical Methods for Detection of Cavities in Khalifa City (B) of Abu Dhabi Emirate, U.A.E.

P001 APPLICATION OF GEOPHYSICAL METHODS FOR DETECTION OF CAVITIES IN KHALIFA CITY (B) OF ABU DHABI EMIRATE U.A.E. 1 Introduction Cavities have been encountered during the construction of infrastructure in Khalifa City (B) Emirate of Abu Dhabi. Heavy groundwater flow through cavities delayed the works for months and resulted in claim by contractors. Moreover cavities are considered hazardous to the future building structures. A geotechnical investigation involving boreholes laboratory test and geophysical survey has been conducted in Khalifa City (B) since 1999. Approximately 1100 line kilometer of geophysical survey has been completed. An integrated risk map has been produced classifying