Hazardous cavities may develop beneath road surface as a result of underground constructions and leaking pipelines. Road surface may suddenly collapse if a cavity keeps growing without being noticed and treated. Therefore, monitoring and forecasting are essential in the prevention of geo-hazard associated with cavities beneath road surface. In the present work, a monitoring approach based on the electrical method using permanent electrode arrays is proposed. The volume effect in electrical exploration enables electrodes installed on curbside to be sensitive to the cavities beneath road surface. A generic pole-pole configuration is employed as it allows the generation of virtual arrays that focus current paths on high-risk areas. The curbside array data are numerically modelled for a synthetic randomly-grown cavity model at a road intersection. The simulation results show that potential difference data anomalies at some virtual array positions can be used as the indicator of surface failure. A field test is also carried out at a street intersection outside of SUSTech to provide a reference of the electrical ambient noise in an urban setting.
Presentation Date: Wednesday, October 14, 2020
Session Start Time: 9:20 AM
Presentation Time: 11:00 AM
Location: Poster Station 5
Presentation Type: Poster
