報告書番号

U03013

タイトル（和文）

動的上下動を考慮した地盤の安定性評価（その3） --動的上下動が原子力発電所基礎地盤や周辺斜面のすべり安全率に及ぼす影響--

タイトル（英文）

Stability Evaluation of Ground Considering Dynamic Vertical Ground Motion(Part3) -Effect of dynamic vertical motions on sliding safety factor of foundation ground and surrounding slope in Nuclear Power Plant-

概要 （図表や脚注は「報告書全文」に掲載しております）

本研究では，岩盤上の地震観測記録より，水平動と上下動の最大加速度出現時間差を分析し，その結果に基づいて両者の最大加速度出現時間差が基礎地盤および周辺斜面のすべり安全率に及ぼす影響について検討した．得られた知見をまとめると以下のようになる．(1)岩盤上の強地震観測記録から，水平動と上下動の最大加速度の出現時間差は，震央距離100km程度までの地震に対する最大加速度出現時間差は概ね10秒以内であった．(2)水平動と上下動の最大加速度出現時間差が最小すべり安全率に及ぼす影響を解析的に検討した結果，いずれのモデル，地盤条件に対しても，ばらつきの程度は最大加速度出現時間差にほとんど依存しないことが示された．

概要 （英文）

In this report, time differences of the peak accelerations between horizontal and vertical motions were investigated based on the earthquake records on the rock sites and analytical studies were carried out in order to investigate the effect of them to the fluctuations of the minimum sliding safety factors of the foundation ground and surrounding slope of nuclear power plants.Summaries of this report were as hollows ;(1)Maximum time difference of the peak accelerations between horizontal and vertical motions on the rock sites was approximately 10 seconds in the earthquakes within the epicenter distance of 100km.(2)Analytical studies that employed the equivalent linear analysis with horizontal and vertical input motions were carried out against the representative models and ground properties of the foundation grounds and surrounding slopes in nuclear power plants. The combinations of the horizontal and vertical motions were determined from the above-mentioned investigation results based on the actual earthquake records. It was revealed that the fluctuations of the minimum sliding safety factors were not seriously affected by the time difference of the peak accelerations between horizontal and vertical motions.

報告者

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