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ESTIMATION METHOD FOR BALLAST SETTLEMENT AMOUNT AT BALLAST TRACK
To provide an estimation method for sleeper displacement amount at a ballast track which can reduce the calculation load of a computer and shorten the calculation period even when a discrete body model using the distinct element method is used.SOLUTION: There is provided a method for estimating a ballast settlement amount at a ballast track for railway vehicles by a numerical analysis method using a discrete body model. The method comprises the steps of: defining a displacement amount calculation formula that defines a relationship between a cumulative load value repeatedly applied to a sleeper from the bottom of a rail and the displacement amount of the top face of the sleeper on the ballast; designating at least a part of a cumulative load value range from calculation start to calculation end as an observation phase, when numerically analyzing the displacement of individual crushed stone elements in order using the displacement amount calculation formula; calculating the displacement of individual crushed stone element as an acceleration phase which is defined as being larger in the cumulative load values of phases other than the above observation phase; and estimating the settlement amount on the top face of the ballast based on the calculated displacement amount of the top face of the sleeper.SELECTED DRAWING: Figure 1
【課題】 個別要素法を用いた離散体モデルを用いた場合であっても、コンピュータの計算負荷を軽減して演算期間を短縮することができるバラスト軌道におけるまくらぎ変位量の推定方法の提供。【解決手段】 鉄道車両用のバラスト軌道におけるバラストの沈下量について離散体モデルを用いた数値解析法により推定する方法である。レール下面からまくらぎに繰り返し負荷される累積荷重値とバラスト上におけるまくらぎ上面の変位量との関係を定義した変位量演算式を定義し、この変位量演算式を用いて個々の砕石要素の変位を順に数値解析する際に、演算開始から演算終了までの少なくとも一部の累積荷重値の範囲を観察フェーズと指定し、個々の砕石要素の変位を上記観察フェーズ以外の累積荷重値においてより大きく定義した促進フェーズとして演算し、演算されたまくらぎ上面の変位量に基づいてバラスト上面の沈下量を推定することを特徴とする。【選択図】図１
ESTIMATION METHOD FOR BALLAST SETTLEMENT AMOUNT AT BALLAST TRACK
To provide an estimation method for sleeper displacement amount at a ballast track which can reduce the calculation load of a computer and shorten the calculation period even when a discrete body model using the distinct element method is used.SOLUTION: There is provided a method for estimating a ballast settlement amount at a ballast track for railway vehicles by a numerical analysis method using a discrete body model. The method comprises the steps of: defining a displacement amount calculation formula that defines a relationship between a cumulative load value repeatedly applied to a sleeper from the bottom of a rail and the displacement amount of the top face of the sleeper on the ballast; designating at least a part of a cumulative load value range from calculation start to calculation end as an observation phase, when numerically analyzing the displacement of individual crushed stone elements in order using the displacement amount calculation formula; calculating the displacement of individual crushed stone element as an acceleration phase which is defined as being larger in the cumulative load values of phases other than the above observation phase; and estimating the settlement amount on the top face of the ballast based on the calculated displacement amount of the top face of the sleeper.SELECTED DRAWING: Figure 1
【課題】 個別要素法を用いた離散体モデルを用いた場合であっても、コンピュータの計算負荷を軽減して演算期間を短縮することができるバラスト軌道におけるまくらぎ変位量の推定方法の提供。【解決手段】 鉄道車両用のバラスト軌道におけるバラストの沈下量について離散体モデルを用いた数値解析法により推定する方法である。レール下面からまくらぎに繰り返し負荷される累積荷重値とバラスト上におけるまくらぎ上面の変位量との関係を定義した変位量演算式を定義し、この変位量演算式を用いて個々の砕石要素の変位を順に数値解析する際に、演算開始から演算終了までの少なくとも一部の累積荷重値の範囲を観察フェーズと指定し、個々の砕石要素の変位を上記観察フェーズ以外の累積荷重値においてより大きく定義した促進フェーズとして演算し、演算されたまくらぎ上面の変位量に基づいてバラスト上面の沈下量を推定することを特徴とする。【選択図】図１
ESTIMATION METHOD FOR BALLAST SETTLEMENT AMOUNT AT BALLAST TRACK
バラスト軌道におけるバラスト沈下量の推定方法
KONO AKIKO (author) / SOGABE MASAMICHI (author)
2019-09-05
Patent
Electronic Resource
Japanese
IPC:
E01B
PERMANENT WAY
,
Gleisoberbau
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