Application Case of the Soil Nailing Method to the Embankment Slope

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  • KAWANAMI Toshihiro
    Department of Investigation Designing, West Nippon Expressway Engineering Chugoku Co., Ltd.
  • SAIJYOU Kengo
    Chugoku Branch Office, Miyoshi Freeway Office, West Nippon Expressway Co., Ltd.
  • TAKEMOTO Masaru
    Road Division of Research, Earthwork Laboratory, Nippon Expressway Research Institute Co., Ltd.
  • NAKATA Yukio
    Graduate School of Sciences and Technology for Innovation, Yamaguchi University

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Other Title
  • 鉄筋挿入工の盛土のり面への適用事例

Abstract

<p>Soil nailing method, which has been widely used on cut slopes, is being adopted to the embankment slopes as a preventive maintenance measure against earthquakes, and to ensure the safety during the restoration of collapse due to heavy rain. However, there are no guidelines for applying the method on the embankment reinforcement, and only a limited number of reports on the design and applied cases. This paper is on the case where the soil nailing method was applied to the embankment slope as an emergency restoration method of the collapse due to torrential rainfall. The reinforced slope did not show any failure during the “In July 2018 torrential downpour” in July 2018, even though the directly neighboring embankment slope failed. The length of the nailing rod was calculated using the assessed value of the ultimate shaft friction in the Cut Slope Reinforcement Earthwork Guideline, in order to reinforce the shortage of the deterrence necessary to stabilize the failed slope. As a result, the reinforcing effect on the embankment slope, and the applicability of the guideline for the cut slope was confirmed. In addition, the points of attention on the construction when applying the method to the embankment, and the importance of using the drainage method in conjunction were also recognized. </p>

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