A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PROBLEM TO BE SOLVED: To increase estimation accuracy of a ground characteristic.SOLUTION: There is provided a ground estimation method for estimating a dominant frequency of a ground having a hard bedrock below a ground surface. The ground estimation method includes: a microtremor measurement step of measuring a microtremor in a horizontal x-direction, a microtremor in a horizontal y-direction orthogonal to the horizontal x-direction, and a microtremor in a vertical direction, at a plurality of angular positions obtained by rotating the horizontal x-direction and the horizontal y-direction on a horizontal plane; a spectrum calculation step of calculating a spectrum Hx, a spectrum Hy, and a spectrum V for each of the plurality of angular positions, based on the microtremor in the horizontal x-direction, the microtremor in the horizontal y-direction, and the microtremor in the vertical direction; and a dominant frequency estimation step of obtaining the angular position with a most closely resembling form based on the spectrum Hx and the spectrum Hy, or a Hx/V spectrum ratio or a Hy/V spectrum ratio at each angular position, and then estimating the dominant frequency of the ground based on the spectrum Hx, the spectrum Hy, and the spectrum V at the obtained angular position.SELECTED DRAWING: Figure 7
【課題】地盤の特性の推定精度を高める。【解決手段】地表面の下方に硬質基盤を有する地盤の卓越振動数を推定する地盤推定方法であって、水平ｘ方向の常時微動と、水平ｘ方向と直交する水平ｙ方向の常時微動と、鉛直方向の常時微動とを、水平ｘ方向及び水平ｙ方向を水平面内で回転させた複数の角度位置で測定する常時微動測定工程と、複数の角度位置毎に、水平ｘ方向の常時微動、水平ｙ方向の常時微動、鉛直方向の常時微動からそれぞれスペクトルＨｘ、スペクトルＨｙ、スペクトルＶを算出するスペクトル算出工程と、各々の角度位置におけるスペクトルＨｘとスペクトルＨｙ、又は、Ｈｘ／Ｖスペクトル比とＨｙ／Ｖスペクトル比から形状が最も似ている角度位置を求め、当該角度位置のスペクトルＨｘ、スペクトルＨｙ、スペクトルＶに基づいて地盤の卓越振動数を推定する卓越振動数推定工程とを有する。【選択図】図７
PROBLEM TO BE SOLVED: To increase estimation accuracy of a ground characteristic.SOLUTION: There is provided a ground estimation method for estimating a dominant frequency of a ground having a hard bedrock below a ground surface. The ground estimation method includes: a microtremor measurement step of measuring a microtremor in a horizontal x-direction, a microtremor in a horizontal y-direction orthogonal to the horizontal x-direction, and a microtremor in a vertical direction, at a plurality of angular positions obtained by rotating the horizontal x-direction and the horizontal y-direction on a horizontal plane; a spectrum calculation step of calculating a spectrum Hx, a spectrum Hy, and a spectrum V for each of the plurality of angular positions, based on the microtremor in the horizontal x-direction, the microtremor in the horizontal y-direction, and the microtremor in the vertical direction; and a dominant frequency estimation step of obtaining the angular position with a most closely resembling form based on the spectrum Hx and the spectrum Hy, or a Hx/V spectrum ratio or a Hy/V spectrum ratio at each angular position, and then estimating the dominant frequency of the ground based on the spectrum Hx, the spectrum Hy, and the spectrum V at the obtained angular position.SELECTED DRAWING: Figure 7
【課題】地盤の特性の推定精度を高める。【解決手段】地表面の下方に硬質基盤を有する地盤の卓越振動数を推定する地盤推定方法であって、水平ｘ方向の常時微動と、水平ｘ方向と直交する水平ｙ方向の常時微動と、鉛直方向の常時微動とを、水平ｘ方向及び水平ｙ方向を水平面内で回転させた複数の角度位置で測定する常時微動測定工程と、複数の角度位置毎に、水平ｘ方向の常時微動、水平ｙ方向の常時微動、鉛直方向の常時微動からそれぞれスペクトルＨｘ、スペクトルＨｙ、スペクトルＶを算出するスペクトル算出工程と、各々の角度位置におけるスペクトルＨｘとスペクトルＨｙ、又は、Ｈｘ／Ｖスペクトル比とＨｙ／Ｖスペクトル比から形状が最も似ている角度位置を求め、当該角度位置のスペクトルＨｘ、スペクトルＨｙ、スペクトルＶに基づいて地盤の卓越振動数を推定する卓越振動数推定工程とを有する。【選択図】図７
GROUND ESTIMATION METHOD
地盤推定方法
HAGIWARA YOSHINORI (author)
2017-10-26
Patent
Electronic Resource
Japanese
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