Abstract
The purpose of this report is to discuss how to account for the fracture behaviors in re-opening, shut-in and circulation. Some laboratory re-opening and shut-in tests were conducted under various stress condition, and circulation tests were conducted under various flow rate and stress condition for single and cross hydro-fractures created in Inada granite and Kofu andesite.The results of re-opening tests show that the values of re-opening pressure are of high application to stress evaluation because of the smaller influences of flow rate and permeation. The values of shut-in pressure were recognized to be equal to the normal stresses to fracture with 20% of accuracy for created fractures in 30 cm cubical specimens.The relationship between steady flow pressure and square root of injected flow rate was obtained to be linear by circulation tests for single fracture, and for cross fractures, steady flow pressure were recognized to be limited in spite of increasing of injected flow rate. It is suggested from the comparison of the results of circulation tests and numerical analyses through coupled F. E. M. and D. D. M. on finite element that the existences of the residual aperture of fracture under stressed condition which comes from asperities of the fracture must be taken into consideration in the model for more precise simulation.
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