表面波および微動アレイ探査を併用した東竹沢天然ダム堤体の内部構造調査  [in Japanese] Investigation on the internal structure of Higashi-Takezawa landslide dam using surface wave method and microtremor array measurements  [in Japanese]

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Abstract

2004年10月23日に発生した新潟中越地震により,芋川中流部の東竹沢と寺野地区において地すべりが発生し,天然ダムが形成された。この二つの天然ダムに対して,決壊による二次災害を未然に防止するために,直ちに緊急対策が取られ,順次応急対策及び恒久対策が進められた。天然ダム堤体の内部構造を調査し,より信頼性の高い天然ダム安定性評価手法を開発するため,東竹沢天然ダムに対して,高精度表面波探査および微動アレイ調査を併用し,ダム堤体のS波速度構造を調べた.また,得られたダム堤体のS波速度構造から,地すべりの運動・堆積過程についても考察した。

During the 2004 Mid-Niigata Prefecture earthquake, thousands of landslides were triggered, among them two large scale landslides (Higashi-Takezawa and Terano landslides) occurred within past landslide masses and dammed the river at the toe of the landslides. To understand the internal structure of the landslide dam and then provide more reliable parameters for the stability analysis of landslide dam, we used a multiple channel surface wave technique and microtremor array measurements to survey the S-wave velocity profile. The results showed that the integrated use of these methods is effective for the S-wave velocity structure of landslide dam, irrespective of the mountainous environment. Based on survey results, the landsliding mechanism and further research on elevating the reliability of landslide dam stability were discussed.

Journal

  • Journal of the Japan Landslide Society

    Journal of the Japan Landslide Society 52(5), 233-238, 2015

    The Japan Landslide Society

Codes

  • NII Article ID (NAID)
    130005103421
  • NII NACSIS-CAT ID (NCID)
    AA11837172
  • Text Lang
    JPN
  • ISSN
    1348-3986
  • NDL Article ID
    026800861
  • NDL Call No.
    Z15-405
  • Data Source
    NDL  J-STAGE 
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