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Estimation of three-dimensional stress distribution and elastic moduli in rock mass of the Tono area

東濃地域における岩盤の三次元応力場と弾性係数の評価

奈良 禎太*; Cho, S. H.*; 吉崎 貴哉*; 金子 勝比古*; 佐藤 稔紀* ; 中間 茂雄; 松井 裕哉 

Nara, Yoshitaka*; Cho, S. H.*; Yoshizaki, Takaya*; Kaneko, Katsuhiko*; Sato, Toshinori*; Nakama, Shigeo; Matsui, Hiroya

本研究は原位置における初期応力測定結果等から広域的な応力場及び岩盤の弾性係数を同時に評価するための3次元有限要素法による逆解析手法を示したものである。本研究では、3次元応力場の評価精度を向上させるため、弾性係数の異なる不均質な地層モデルを考慮し、東濃鉱山,正馬様用地及び瑞浪超深地層研究所用地を含む領域の広域的な応力場の逆解析に適用した。

This study presents a back analysis based on three-dimensional finite element analysis in order to estimate the regional stress fields and the elastic moduli of a rock mass simultaneously from in situ measurements. In order to improve the accuracy of the estimation of three-dimensional stress field, heterogeneities in a rock mass consisting of geological layers with different elastic properties was considered. Back analysis was applied to determine the regional stresses for a broad field study that includes Tono Mine, the Shobasama Site and the Mizunami Underground Research Laboratory (MIU) Construction Site.

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