Collapse risk evaluation of subsurface cavities and development of rational countermeasures considering road structure and cavity characteristics.

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Other Title
  • 道路構造及び空洞特性を考慮した陥没危険度評価と合理的路面下空洞対策
  • -Cavity behaviour in a full-scale test road-
  • ―実物大試験道路における空洞挙動の解明―

Abstract

<p>In order to solve the problems related to subsurface cavities in urban areas, a joint research project between industry, government and academia from 2018 to 2020 was carried out. It has analysed existing cavity data, conducted laboratory model experiments, numerical analysis, full-scale field tests and cavity monitoring on the road, and attempted to develop a "series of rational processes for investigation planning, cavity exploration, collapse risk diagnosis and cavity repair". Based on the analysis of the formation and expansion mechanisms and actual conditions of cavities, a cavity potential map, a collapse risk assessment index and a menu of cavity repair and prevention measures were developed. Here, an overview of the cave-in prevention solution and a full-scale field test are reported. A full-scale test road with artificial cavities was constructed and loading tests were conducted on the road surface to elucidate the cavity behaviour in order to develop a cave-in hazard assessment and repair method that takes the road structure into account.</p>

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