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BEM-DDM modelling of rock damage and its implications on rock laboratory strength and in-situ stresses

岩石の力学物性及び初期応力状態に関するBEM-DDM解析とその評価

Lanaro, F.*; 松井 裕哉

Lanaro, F.*; Matsui, Hiroya

本研究は、超深地層研究計画の一環として、土岐花崗岩を対象として室内試験から得られる強度に関するコアの損傷の効果を決定することを主目的として実施した。室内試験結果の分析により、ボーリング孔軸方向に力学特性の変化が認められるとともに、室内試験で得られた強度と初期応力状態に相関があることが推定された。これを確認するため、FRACOD 2Dと呼ばれるBEM-DDM解析コードによる数値解析を行い、室内試験時などに発生する割れ目のパターン等を検討するとともに、花崗岩体中で見られる割れ目帯の成因についても考察した。

This study was conducted to determine the effects of sample damage on the strength obtained from laboratory results (uniaxial compression and Brazilian test). Results of testing on samples of Toki granite taken at Shobasama and at the construction site for the Mizunami Underground Research Laboratory (MIU) were analysed. Some spatial variation of the results along the boreholes suggested the presence of a correlation between the laboratory strength and the in-situ stresses measured by means of the hydro-fracturing method. To confirm this, numerical analyses of the drilling process in brittle rock by means of a BEM-DDM program (FRACOD2D) were carried out to study the induced fracture patterns. Moreover, a numerical study of the fracture patterns induced by removal of the overburden on a large scale produces fracture patterns and stress distributions corresponding to observations in crystalline hard rock in Canada, Japan and Sweden.

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