Construction method suitable for rock damage constitutive model under cyclic load

A constitutive model and construction method technology, which is applied in the direction of using stable tension/pressure to test the strength of materials, measuring devices, instruments, etc. Consider damage effects, etc.

Active Publication Date: 2020-03-27
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] (1) At the experimental level, there are many studies on the macroscopic mechanical properties of rocks under cyclic loading, and there are few studies on damage mechanical properties through the establishment of rock damage constitutive models under cyclic loading;
[0007] (2) The current technical scheme mainly considers the deformation and strength characteristics separately, and does not comprehensive...

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  • Construction method suitable for rock damage constitutive model under cyclic load
  • Construction method suitable for rock damage constitutive model under cyclic load
  • Construction method suitable for rock damage constitutive model under cyclic load

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Embodiment Construction

[0079] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the examples. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0080] Such as figure 1 As shown, a construction method suitable for rock damage constitutive model under cyclic loading includes the following steps:

[0081] Step 1. Solve the elastic-plastic matrix based on the secondary loading surface theory and the modified CWFS model;

[0082] Step 2, establishing an equation applicable to the rock damage constitutive model under cyclic loading;

[0083] Step 3. Based on the finite element software, perform numerical simulation on the three-axis stepwise cyclic loading and unloading test to verify the applicability and accuracy of the cons...

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Abstract

The invention discloses a construction method suitable for a rock damage constitutive model under the cyclic load. The method comprises the following steps of solving an elastic-plastic matrix on thebasis of a secondary loading surface theory and a modified CWFS model; and establishing an equation suitable for the rock damage constitutive model under the cyclic load. The method aims to accuratelydescribe the nonlinear mechanical behaviors of a rock material under the cyclic load, comprising a hysteretic ring, the accumulated plastic strain and a damage effect, and the secondary loading surface theory has been successfully applied to the metal, soil and concrete, so that a new path is opened up for establishing the rock damage constitutive model under the cyclic load based on the secondary loading surface theory in combination with a Ducker-Prager yield criterion and by adopting the modified CWFS model.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for constructing a constitutive model of rock damage under cyclic loading. Background technique [0002] In engineering fields such as transportation, construction, mining and water conservancy, cyclic loads and fatigue problems are often encountered. The strength and deformation laws of rocks under cyclic loads are significantly different from those under static loads. Therefore, studying the mechanical properties of rock under cyclic loading is of great significance to the long-term stability evaluation of engineering, and the establishment of a damage constitutive model suitable for rock under cyclic loading is the basis for carrying out long-term stability evaluation of rock engineering. It is one of the important issues that urgently need to be solved in rock engineering design. [0003] At present, there are many researches at home and...

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Application Information

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IPC IPC(8): G01N3/08G01N3/02
CPCG01N3/02G01N3/08G01N2203/0019G01N2203/0075G01N2203/0208G01N2203/0252G01N2203/0256G01N2203/0676G01N2203/0682
Inventor 周永强盛谦付晓东冷先伦
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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