Detection Of Subsurface Cavities PDF Download

Research has been in progress since July 1970 at the U.S. Army Engineer Waterways Experiment Station to determine these methods which offer the most promising results for detecting subsurface cavities and what might be done to further develop them. Through extensive field tests, it has been determined that none of the standard electrical resistivity procedures give consistently good results. However, as a result of the initial field testing, a new process of data interpretation has been developed for one specific electrode configuration. The modified procedure produced excellent results during field tests over known cavities in Indiana and Missouri. Cavities less than 10 ft in diameter and at depths greater than 100 ft were located. To date, this new procedure has been applied only to air-filled cavities. However, research is continuing to adapt this process for locating water- or mud-filled cavities.