粘性土路盤区間におけるバラスト軌道の保守多投入箇所の成因に関する実験的検討  [in Japanese] EXPERIMENTAL STUDY ON THE MECHANISM CAUSING FREQUENT MAINTENANCE LOCATIONS IN A RAILWAY BALLASTED TRACK FOR A CLAYEY SUBGRADE SECTION  [in Japanese]

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Abstract

本研究では,東海道新幹線の粘性土路盤区間における保守多投入箇所の成因の検証を目的に,道床・路盤状態を模擬した模型地盤に対して繰返し載荷試験を実施し,道床厚や含水状態がバラスト軌道の沈下に与える影響について検討を行った.模型地盤は実物の1/5サイズとし,バラスト,細粒化バラスト,砕石混じりロームの3層構成とした.試験結果から,道床厚(バラストと細粒化バラストの層厚の合計)が薄くなると載荷初期の沈下量は小さいが,路盤圧力が大きいため,路盤表層の飽和度が上昇すると路盤表層が軟弱化してまくらぎの沈下進みが速くなること,一方で道床厚が厚くなると路盤表層の飽和度が上昇してもまくらぎの沈下進みは遅い傾向にあることが明らかとなった.

 In this study, cyclic loading tests were carried out on model grounds simulating the conditions of track and roadbed in the clayey roadbed section of the Tokaido Shinkansen, in order to verify the mechanism which causes frequent maintenance locations. Effects of the ballast layer thickness and the water intrusion on the track settlement were investigated. The model grounds were set to 1/5 size of the real ones, and based on the field survey results, they were consisted of three layers of ballast, fouled ballast and ballast mixing loam, respectively. The test results show that as the ballast layer thickness (the sum of ballast and fouled layer thickness) decreases, the settlement amount in the initial stage of loading become smaller, but as the saturation degree of the roadbed surface layer increases the settlement rate becomes higher because the earth pressure acting on the roadbed surface become higher and the road surface softens. It was also found that the thicker ballast layer can significantly lower the settlement even though the degree of saturation of the roadbed is increased.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering) 74(3), I_19-I_27, 2018

    Japan Society of Civil Engineers

Codes

  • NII Article ID (NAID)
    130007557214
  • Text Lang
    JPN
  • NDL Article ID
    029409966
  • NDL Call No.
    Z74-H295
  • Data Source
    NDL  J-STAGE 
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