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Rock cohesive force-internal friction angle calculation method based on digital core technology

A technology of rock cohesion and internal friction angle, applied in the direction of applying stable tension/pressure to test material strength, preparation of test samples, instruments, etc., can solve problems such as limitations

Inactive Publication Date: 2021-03-19
SOUTHWEST PETROLEUM UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the current digital core research is mostly limited to seepage simulation and calculation of rock acoustic, electrical and physical properties.

Method used

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  • Rock cohesive force-internal friction angle calculation method based on digital core technology
  • Rock cohesive force-internal friction angle calculation method based on digital core technology
  • Rock cohesive force-internal friction angle calculation method based on digital core technology

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Embodiment Construction

[0020] In order to facilitate the description of the technical means, objectives and model effects of the present invention, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings and embodiments. It should be noted that the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without other innovative efforts shall belong to the protection scope of the present application.

[0021] figure 1 It is a flow chart of an embodiment of a rock cohesion-internal friction angle calculation method based on digital core technology in the present application, including the following steps:

[0022] S1: Prepare rock samples for rock nanoindentation experiments. The original rock sample specifications are slices with a thickness of 5mm, a...

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Abstract

The invention discloses a rock cohesive force-internal friction angle calculation method based on a digital core technology. The method comprises the following steps: obtaining micro-scale mechanicalparameters of an original rock sample as input parameters of numerical simulation based on a rock nanoindentation experiment result; carrying out a micro-CT scanning test on the rock core to obtain arock micro-pore structure image, and reconstructing a three-dimensional grid model of the rock sample RVE; carrying out triaxial compression numerical simulation research of a rock sample RVE model based on a Moore Coulomb criterion; and obtaining the maximum compressive strength under different confining pressures according to a triaxial compression numerical simulation result, drawing an optimalrelation curve of the axial stress sigma 1 and the confining pressure sigma 3, and then solving the cohesive force and the internal friction angle of a rock matrix on the basis of the principle of aleast square method.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a method for acquiring rock mechanics parameters based on digital core technology. Background technique [0002] As a heterogeneous porous medium composed of various minerals, pores, cracks and cements, rock’s macroscopic mechanical behavior is determined by its internal microstructure and mineral composition, especially affected by rock microscopic deformation, microcrack initiation-expansion, etc. — Influences throughout the evolutionary process. [0003] With the development of imaging technology, microscopic images of rocks can be obtained through high-resolution SEM and CT technologies, digital images of rocks can be obtained through a series of processing such as filtering and segmentation of images, and digital core models can be established in combination with model reconstruction algorithms. Numerical simulation has become an important breakthrough in the study o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N19/02G01N23/046G01N1/28G01N1/32
CPCG01N3/08G01N19/02G01N23/046G01N1/286G01N1/32G01N2001/2873
Inventor 任贇祺宋睿郑立傅田均段垚江唐渝
Owner SOUTHWEST PETROLEUM UNIV
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