A study on the process of generation, expansion and collapse of subsurface cavities in roads

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  • KUWANO Reiko
    Institute of Industrial Science, The University of Tokyo
  • OHARA Yu
    Railway Technical Research Institute (Former Graduate Student of The University of Tokyo)

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Other Title
  • 路面下空洞の生成・拡大メカニズムと陥没危険度の評価

Abstract

<p>As a countermeasure for the road cave-in’s, it is effective to find and treat subsurface cavities under the road pavement before their collapses. Recently, thanks to the Ground Penetration Radar technology, a lot of subsurface cavities within 1.5m deep are being detected in the practice of road maintenance and management. Repair works for the cavity should be prioritized according to its collapsing risk. The appropriate way for the risk evaluation of cavity collapse is therefore urgently required. In this study, the mechanism and process of cavity generation, expansion and surface collapse were investigated by a series cavity model tests including loading tests above a cavity. The condition for surface soil collapsing was examined and it was found that the surface collapse can be evaluated by the ratio of cavity depth and width. The threshold value for the cavity collapse obtained from the model tests almost agrees with the value for cave-in cases in the national road.</p>

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