2016 Volume 4 Issue 3 Pages 44-48
In recent years, the phenomenon of ground subsidence in major cities has caused social problems such as damage to roads and structures, inhibition of people’s safety, and property damage. A survey released by the City of Seoul has showed that more than 80% of the phenomenon of ground subsidence occurred mainly around sewer pipes. Since sewer pipes tend to rapidly deteriorate, a technical standard is needed in order to effectively carry out replacements and repair reinforcement by evaluating the soundness of the existing sewer pipe and identifying any common occurrences of danger. In this study, the effective seismic survey technology for detecting a cavity near to sewer pipe was chosen as GPR, density logging, and impulse response method for the deteriorated sewer pipe. The pilot plant test was carried out so as to verify the performance of the cavity detection of the corresponding technique. Each method could detect the cavity proximity to the sewage pipe, but there was a difference in the applicable limit and detection performance according to each method.
