Static transverse isotropic rock mechanics experiment and analysis method

Abstract

The invention provides a static transverse isotropic rock mechanics experiment and analysis method. The method comprises the steps of preparing a horizontal sample, a vertical sample and at least two samples in an included angle sample in a same vertical plane, carrying out a triaxial compression failure experiment on each sample and recording axial deformation of each sample and lateral deformations of two directions in the experiment process; and substituting the experiment data into an induced stress-strain equation set and cooperatively solving the equation set to obtain five independent rock mechanics parameters, namely 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. Five independent parameters of a stiffness matrix instead of two independent parameters of isotropic rock mechanics are given by the analysis result of the method; the static transverse isotropic rock mechanics experiment and analysis method conforms to the actual condition and is suitable for rock mechanics experiment and analysis of a sedimentary rock and a shale; anisotropic behaviors of the rock mechanics can be more accurately and reasonably described.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics experiment methods, and in particular relates to an experiment and analysis method of static transversely isotropic rock mechanics. 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 strain and radial strain of the sample during the axi...

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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