A Method for Obtaining Rock Microscale Elastic Modulus and Yield Strength

A technology of elastic modulus and yield strength, which is used in the field of obtaining micro-scale mechanical parameters of rock, and can solve problems such as difficulty in obtaining

Active Publication Date: 2021-08-24
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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Problems solved by technology

[0003] Aiming at the defect that it is difficult to obtain micron-scale mechanical parameters of rocks at present, the present invention discloses an experimental and numerical simulation method for rock micron-scale elastic modulus and yield strength parameters

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  • A Method for Obtaining Rock Microscale Elastic Modulus and Yield Strength

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[0021] 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.

[0022] figure 1 It is a flowchart of an embodiment of a method for obtaining rock microscale elastic modulus and yield strength in the present application, including the following steps.

[0023] S1: Prepare rock core slices for micro-indentation experiments. Take rock slices with a thickness of 2 mm from the original rock samples, and perform surface p...

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Abstract

The invention discloses a method for acquiring micro-scale rock elastic modulus and yield strength parameters. The method includes: using a micron-scale indenter to carry out a rock micron indentation experiment, obtaining a load-displacement curve during the loading process, and combining the indentation experiment formula to obtain the elastic modulus of the rock under different displacement conditions; carrying out micro-CT on the rock sample Scan to establish a finite element mesh model of the rock skeleton in the indentation area; use the elastic modulus obtained from the micron indentation experiment as an input parameter to simulate the rock uniaxial compression process, obtain the overall elastic modulus of the model and compare it with the core uniaxial compression experiment , determine the indentation depth RVE that effectively characterizes the micron elastic modulus of the rock; then, carry out the numerical simulation of rock sample indentation experiments under different yield strength conditions, and compare and verify the loading and unloading load-displacement curves obtained from the simulation with the indentation experiments , so as to determine the yield strength of the rock at the micron scale.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a method for acquiring rock microscale mechanical parameters. Background technique [0002] As a heterogeneous porous medium material, rock's macroscopic mechanical properties are closely related to pore structure characteristics and mineral components. A large number of theories and experiments have shown that the deformation and fracture of rocks originate from the microcosm. Micro-scale rock deformation and fracture research requires corresponding scale mechanical parameters. However, the size of rock samples in traditional uniaxial and triaxial compression tests are all above centimeters, and the obtained rock mechanical parameters can only meet the research of macroscopic rock mechanical properties. These experiments cannot be applied in the preparation and precision measurement of rock samples. The study of rock parameters down to the micron scale. There are also ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0019G01N2203/0075G01N2203/0282
Inventor 宋睿郑立傅汪尧崔梦梦彭珈筠郑玲静
Owner SOUTHWEST PETROLEUM UNIV
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