Abstract
The main contribution of this paper is to develop an algorithm to estimate in situ stress using a hybrid numerical method based on data of local stress measurement. Suggested hybrid method, first, estimates field stresses using an adverse Boundary Element Method (BEM3D) and local stresses are then calculated by Finite Element (FEM3D) or Finite Difference Methods (FDM3D) under certain conditions. Also it is possible to reach arbitrary accuracy for stress estimation. To show the applicability of this algorithm, it is applied for the Seymare Dam (SD) site to determine the stress field. Based on the local stresses measured by Hydraulic Fracturing (HF), the stress state at SD is estimated by the proposed algorithm in which the far-field stress state has been calculated using a 3D boundary element code, after which the local in situ stresses are calculated using a 3D finite element code. Finally, the results are compared with those elicited from the HF method. The finite element results, considering 10% allowable error, roughly coincides with the measured results.
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