A Transversely Isotropic Rock Mechanics Testing and Analysis Method

Abstract

The invention provides a transverse isotropic rock mechanical test and analysis method. The method comprises the following steps: preparing three samples, i.e. a horizontal sample, a vertical sample and an angular sample in a same vertical plane, performing a triaxial compression breaking test on each sample, recording axial deformation and lateral deformation of each sample in the experiment process, substituting experiment data into a derived stress-strain equation set, and co-solving the equation set, obtaining five independent rock mechanical parameters, i.e. a horizontal Young modulus, a poisson ratio in a horizontal plane, a vertical Young modulus, a poisson ratio in a vertical plane and a shear modulus in the vertical plane. An analysis result of the method gives five independent parameters of a rigidity matrix rather than two independent parameters of conventional isotropic rock mechanics, the method can better conform to the real situation, can more accurately and reasonably describe the anisotropic behaviors of the rock mechanics, and is particularly suitable for mechanical test and analysis of the rock having transverse isotropic rock mechanical characteristics such as shale, sedimentary rock and the like.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics test methods, and in particular relates to a transversely isotropic rock mechanics test and analysis method. Background technique [0002] The existing rock mechanics test methods are mainly isotropic rock mechanics experiments and analysis techniques, that is, the rock mechanics properties in all directions of the rock are considered to be the same. The laboratory test only needs to obtain two rock mechanical parameters: Young's modulus and Poisson's ratio; the experimental sample only needs one core sample, and the preparation of the core sample is to take the core in any direction; the experimental method is to first load the core sample to a confining pressure Then keep the confining pressure constant, and then load the axial pressure (i.e. deviatoric stress) until the core sample is destroyed, record the axial and radial deformation of the sample during the loading process of the confi...

AI Technical Summary

Problems solved by technology

[0005] The existing isotropic rock mechanics experiment method is suitable for rocks with little difference in rock mechanical properties in all directions, such as sandstone, etc.; but not suitable for formations with significant differences in rock mechanical properties in all directions, such as sedimentary rock and shale, etc.

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