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Report No.
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Development of method for evaluation of three dimensional distribution of in situ stress state and preliminary estimation of applicability

Tanno, Takeo; Hirano, Toru*; Matsui, Hiroya

Japan Atomic Energy Agency has developed a method for accurate evaluation of the distributions of actual in-situ stress state at any point using limited results of in-situ stress measurement from surface based investigations. We assumed that the actual stress components are formed by a combination of overburden pressure and the plate tectonic force, and constructed two types of models, the three-dimensional finite element method and the boundary element method that considered the existence of geological heterogeneity, such as variations in rock type and faults. Afterwards, as a validation of these models, we applied this method to in-situ stress state evaluation for some locations around the Mizunami Underground Research Laboratory (MIU).

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