能登半島地震による能登有料道路の被災と復旧‐盛土の被害と対策工事について‐  [in Japanese] Noto Peninsula Earthquake damage to Noto Toll Road and its restoration- Embankment damage and countermeasure work -  [in Japanese]

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Abstract

2007年3月25日に発生した最大震度6強の能登半島地震により,能登有料道路は柳田IC~穴水IC間48.2kmにおいて,大規模な高盛土の崩壊が11箇所,路面の段差・クラックが37箇所,橋梁損傷が6箇所と甚大な被害が発生し,地震直後から車輌通行止めの事態に至った。関係者の尽力により1ヶ月間の応急復旧工事の後に暫定的に通行が可能となり,その後の本復旧工事を経て,2007年11月30日に全面復旧を成した。本文では,盛土構造物を対象に能登有料道路の特徴,地震による被害の状況,対策工のために行った土質調査や試験結果,そして,復旧工法の設計,施工に至る一連の流れを述べるとともに,被災原因についても検討した。被災のメカニズムとして,地下水で飽和された盛土法尻部が地震力により脆弱化し,これによって盛土内のすべりが発生した可能性が高いことを示した。

The earthquake with a maximum seismic intensity of 6 upper that struck Noto Peninsula on March 25, 2007, has caused extensive damage to the 48.2 km length between Yanaida Exit and Anamizu Exit on the Noto Toll Road. Large-scale collapse of high embankments at 11 locations, difference in road surface level and cracks at 37 locations, and damage to bridge at 6 locations has forced the closure after the earthquake. The road was temporarily opened to traffic after a month long emergency restoration efforts by concerned parties. Main restoration was conducted afterwards, and on November 30, 2007 the road has been fully restored. Focusing on embankment structures as the target, this paper describes the characteristics of Noto Toll Road, the earthquake damage condition, geotechnical surveys and tests that were conducted to analyze countermeasure works; design and execution of restoration construction, and also presents the result of a study on the cause of the disaster. The study shows that in the disaster mechanism, the embankment foot, which was saturated by groundwater, became fragile due to seismic force and very likely caused a slip inside the embankment.

Journal

  • Japanese Geotechnical Journal

    Japanese Geotechnical Journal 4(4), 289-305, 2009

    The Japanese Geotechnical Society

Codes

  • NII Article ID (NAID)
    130004482789
  • Text Lang
    JPN
  • Data Source
    J-STAGE 
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