Geophysical Methods for Defect Mapping and Pipeline Integrity Surveys Geophysical Methods for Defect Mapping and Utility Risk Analysis

摘要

Ground-penetrating radar systems are now commonly available to assist with non-destructive testing of pipeline and sewer system utilities. These surveys can also provide additional information relating to the rock condition beyond the pipeline or sewer wall. Suspect zones detected in Brisbane have been confirmed by drilling and repair work has been completed prior to collapse. Radar systems are considered to be an effective technique but productivity can be questionable. A cost effective solution is now required to limit radar and geotechnical surveys to cover suspect areas alone. Consequently several additional geophysical techniques have now been extensively tested in Brisbane to complement CCTV and radar data. Encouraging results have been obtained with TEM resistivity data to provide an indication of structural integrity in terms of variations in substrate resistivity. However high definition seismic systems are now required to provide more detail on the nature of the target and new research programs have been developed for this purpose.