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VIBRATION REDUCTION METHOD IN FOUNDATION ENVIRONMENT, AND WEIGHT FOR VIBRATION REDUCTION THEREFOR
PROBLEM TO BE SOLVED: To provide a method for easily predicting a reduction effect while reducing cost of vibration reduction in a foundation environment.SOLUTION: On a ground surface between a vibration source on the ground surface and an object of vibration reduction, a weight for reducing vibrations is laid in a columnar direction orthogonal to a straight line connecting centers of gravity of the vibration source and the object. A mass in the weight (a mass of the weight per meter with a width B and in the column direction) is represented as m=(1/(1+(α/R)))×m, where m=((1+ν)/π)ρ×√(Bλ), R is a target vibration reduction rate (reduction amount of vibration amplitude/original vibration amplitude), α is a surface wave contribution rate (0<α<1), mis a mass of clod interacting with the weight of a unit length, ρis a density of a foundation, B is a width (m) of the wight, λ is a wavelength (m) of a surface wave defined as a vibration reduction object, and ν is a Poisson ratio of the foundation. The vibration reduction rate R and the surface wave contribution rate α are set, and the weight is laid in the orthogonal direction in accordance with the mass mof the weight calculated thereby, such that vibrations can be reduced.SELECTED DRAWING: Figure 1
【課題】地盤環境における振動低減のコストを軽減し、簡易に低減効果を予測する方法を提供する。【解決手段】地表面上の振動源と振動低減の対象物との間の地表面に、振動を低減させる重りを、振動源と対象物とのそれぞれの重心を結ぶ直線に直交する列方向に敷設する。重りにおける質量（幅Ｂで列方向１ｍ当たりの重りの質量）は、ｍｗ＝（１／（１＋（α／Ｒ）））・ｍｓ。なお、ｍｓ＝（（１＋ν）／π２）ρｓ・√（Ｂλ３）。ここで、Ｒは、目標とする振動低減率（振動振幅の低減量／元の振動振幅）、αは表面波寄与率（０＜α＜１）、ｍｓは単位長さの重りと相互作用する土塊の質量、ρｓは地盤の密度、Ｂは重りの幅（ｍ）、λは振動低減対象とする表面波の波長（ｍ）、νは地盤のポアソン比、であって、前記振動低減率Ｒ、表面波寄与率αを設定して、それにより求められた重りの質量ｍｗに従って前記直交する方向に敷設し、振動を低減させるようにした。【選択図】図１
VIBRATION REDUCTION METHOD IN FOUNDATION ENVIRONMENT, AND WEIGHT FOR VIBRATION REDUCTION THEREFOR
PROBLEM TO BE SOLVED: To provide a method for easily predicting a reduction effect while reducing cost of vibration reduction in a foundation environment.SOLUTION: On a ground surface between a vibration source on the ground surface and an object of vibration reduction, a weight for reducing vibrations is laid in a columnar direction orthogonal to a straight line connecting centers of gravity of the vibration source and the object. A mass in the weight (a mass of the weight per meter with a width B and in the column direction) is represented as m=(1/(1+(α/R)))×m, where m=((1+ν)/π)ρ×√(Bλ), R is a target vibration reduction rate (reduction amount of vibration amplitude/original vibration amplitude), α is a surface wave contribution rate (0<α<1), mis a mass of clod interacting with the weight of a unit length, ρis a density of a foundation, B is a width (m) of the wight, λ is a wavelength (m) of a surface wave defined as a vibration reduction object, and ν is a Poisson ratio of the foundation. The vibration reduction rate R and the surface wave contribution rate α are set, and the weight is laid in the orthogonal direction in accordance with the mass mof the weight calculated thereby, such that vibrations can be reduced.SELECTED DRAWING: Figure 1
【課題】地盤環境における振動低減のコストを軽減し、簡易に低減効果を予測する方法を提供する。【解決手段】地表面上の振動源と振動低減の対象物との間の地表面に、振動を低減させる重りを、振動源と対象物とのそれぞれの重心を結ぶ直線に直交する列方向に敷設する。重りにおける質量（幅Ｂで列方向１ｍ当たりの重りの質量）は、ｍｗ＝（１／（１＋（α／Ｒ）））・ｍｓ。なお、ｍｓ＝（（１＋ν）／π２）ρｓ・√（Ｂλ３）。ここで、Ｒは、目標とする振動低減率（振動振幅の低減量／元の振動振幅）、αは表面波寄与率（０＜α＜１）、ｍｓは単位長さの重りと相互作用する土塊の質量、ρｓは地盤の密度、Ｂは重りの幅（ｍ）、λは振動低減対象とする表面波の波長（ｍ）、νは地盤のポアソン比、であって、前記振動低減率Ｒ、表面波寄与率αを設定して、それにより求められた重りの質量ｍｗに従って前記直交する方向に敷設し、振動を低減させるようにした。【選択図】図１
VIBRATION REDUCTION METHOD IN FOUNDATION ENVIRONMENT, AND WEIGHT FOR VIBRATION REDUCTION THEREFOR
地盤環境における振動低減方法とその振動低減用重り
NARITA NOBUHIDE (author) / MIWA AKIHIRO (author) / NAKAMURA YASUNORI (author) / HIRONO NAOKI (author) / BABA ASAYUKI (author) / SUZUKI SHINYA (author)
2017-06-29
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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