STUDY ON RATIONAL STRUCTURE FOR TUNNEL INVERT AS COUNTERMEASURES AGAINST HEAVING PHENOMENON

Heaving in some mountain tunnels after completion occurs in roadbeds that were built without an invert because the ground was relatively stable during construction. The stress-release by excavation, along with subsequent swelling of groundwater, cause the roadbed to lose strength, allowing upheaval of the road surface. In this study, the authors analyzed geological degradation characteristics and the state of past tunnels in cases where inverts were installed. And, the authors used measurement data to compare axial forces of inverts with axial forces of early-closure primary inverts in other tunnels at the construction stage. Based on these, the authors discuss the necessary performance. As a result, they used numerical analysis to compare support effectiveness of the invert shape and considered a rational structure.

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  • English
  • Japanese

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  • Accession Number: 01712747
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Apr 19 2019 3:06PM