Study on Subsurface Collapse of Road Surface and Cavity Search in Urban Area

도심지 노면하부 지반함몰 및 공동탐사 사례 연구

  • Received : 2017.11.29
  • Accepted : 2017.12.20
  • Published : 2017.12.31


Recently, road cave-ins, also referred to as ground sinking, have become a problem in urban environments. Public utility facilities such as sewage pipelines, communications pipes, gas pipes, power cables, and other types of underground structures are installed below the roads. It was reported that cave-ins are caused by the aging and lack of proper maintenance of underground facilities, as well as by construction problems. A road cave-in is first initiated by the formation of cavities typically induced by the breakage of underground pipelines. The cavities then grow and reach the base of the pavement. The traffic load applied at the surface of the roads causes an abrupt plastic deformation. This type of accident can be considered as a type of disaster. A road cave-in can threaten both human safety and the economy. It may even result in the loss of human life. In the city of Seoul, efforts to prevent damage before cave-ins occur have been prioritized, through a method of discovering and repairing joints through the 3D GPR survey.


Road cave-in;Human safety;3D GPR survey


  1. Annan AP. 2005, Ground Penetrating Radar, In Near surface geophysics, Butler D.K. Society of exploration geophysicists : Tulsa, Investigations in Geophysics 13, pp. 357-438.
  2. Geomeca, 2017, Seoul City Lower road surface cavity survey The first stage report, Road Management Seoul city.
  3. Harry M. Jol, 2010, Ground Penetrating Radar theory and application, p. 46.
  4. Kuwano R. Kohata Y. and Sato M. 2012. A Case Study of Ground Cave-in due to large Scale Subsurface Erosion in Old Land Fill. ICSE6, Paris, pp. 265-271.
  5. Kweon, G.C, S.L. Kim, S.W. Hong, 2016, Basic study on mechanism of cave-in in road through laboratory model test. Int. J. Higw. Eng. Vol. 18, No. 5, pp. 11-19.
  6. Seoul City, 2016, A Study on the Mechanisms of Road Subsurface Cavity and its Management Plans, p. 8.