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Method for obtaining rock micrometer-scale elasticity modulus and yield strength

A technology of elastic modulus and yield strength, applied in the field of obtaining rock micro-scale mechanical parameters, can solve problems such as difficult to obtain

Active Publication Date: 2018-12-21
SOUTHWEST PETROLEUM UNIV
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  • Application Information

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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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  • Method for obtaining rock micrometer-scale elasticity modulus and yield strength
  • Method for obtaining rock micrometer-scale elasticity modulus and yield strength
  • Method for obtaining rock micrometer-scale elasticity modulus and yield strength

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Embodiment Construction

[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 obtaining the rock micrometer-scale elasticity modulus and yield strength. The method comprises the steps that a rock micrometer indentation experiment is carriedout through a micron-sized pressure head, a load-displacement curve in the loading process is obtained, and the rock elasticity modulus under different displacement conditions can be obtained by combining an indentation experiment formula; micro-CT scanning is carried out on a rock sample, and a finite element mesh model of a rock skeleton in an indentation area is built; the elasticity modulus obtained through the micrometer indentation experiment serves as an input parameter to simulate the rock uniaxial compression process, the model overall elasticity modulus is obtained and compared witha rock core uniaxial compression experiment, and the pressing depth RVE effectively representing the rock micrometer elasticity modulus is determined; and then, rock sample indentation experiment numerical simulation under different yield strength conditions is carried out, the simulated loading and unloading load-displacement curve is compared with the indentation experiment to be verified, and thus the rock micron-sized yield strength is determined.

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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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