Method and system for acquiring three-dimensional ground stress by using rock core
A technology of in-situ stress and core, applied in the field of method and its acquisition system, to achieve the effect of improving efficiency and accurate three-dimensional in-situ stress parameters
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[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0029] According to the classical theory of elastic mechanics, for an isotropic cylindrical core drilled by a vertical borehole, the in-situ stress on the core in its original position is immediately relieved. The initial diameter of the cylindrical core after breaking away from the crustal stress field and before recovering from elastic deformation is d 0 , and the cylindrical section is a true circle at this time. It is assumed that the drilled core is intact and free from micro-cracks and inelastic strain ...
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