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青柳 和平; 名合 牧人*; 亀村 勝美*; 菅原 健太郎*
Proceedings of 9th Asian Rock Mechanics Symposium (ARMS-9) (USB Flash Drive), 10 Pages, 2016/10
Estimates of rock mass stress state and the mechanical characteristics of rock mass are important in the design of deep underground structures such as high-level radioactive waste disposal repositories. Stress measurements are conducted in boreholes to provide estimates of stress state. However, measurement results can vary highly as a result of rock mass heterogeneity, which causes difficulty in stress state evaluation. This study establishes a practical and effective method for estimating in situ stress based on the convergence measurement results obtained during gallery construction of the Horonobe Underground Research Laboratory (URL) project. The convergence was measured in various directions of the URL loop gallery to allow determination of the stress state over a large area. A back-analysis method was developed using the convergence measured during gallery excavation at 350 m depth. This method was applied to estimate the stress state corresponding to the rock mass behavior around the URL. The analysis results show good agreement with the in situ stress state reported in previous studies and confirm the applicability of the proposed method.
Bains, R.S.*; 杉本 純
Engineering Analysis with Boundary Elements, 14, p.267 - 275, 1994/00
被引用回数:4 パーセンタイル:76.68(Engineering, Multidisciplinary)局所的なホットスポットを含む薄肉配管に対する数値解の収束解析を実施した。空間メッシュの細分化に基づいた収束解のパターンが存在する。ホットスポットの近傍で配管内面とホットスポットの温度変化を記述するために温度遷移領域(TTR)を導入した。TTR内の唯一可能な温度場は、BEM法で用いられる内挿関数で表現されるものである。さらに、TTRが薄すぎると数値的な不安定性が起こり、正しくない解を与える場合があることを明らかにした。