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Method for establishing damaged rock constitutive relation by utilizing residual strength

A technology of constitutive relationship and residual strength, applied in the direction of applying stable tension/compression to test material strength, etc., can solve problems such as failure to establish or damage rock constitutive relationship

Inactive Publication Date: 2013-03-27
BEIJING JIAOTONG UNIV +1
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Problems solved by technology

As the confining pressure increases, the residual strength of the rock increases more than the peak strength, and the residual strength gradually becomes the main factor affecting the post-peak section of the total stress-strain curve of the rock. However, in the existing technical solutions, none of the considered Therefore, it is impossible to establish a constitutive relationship of damaged rock that accurately matches the actual situation

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  • Method for establishing damaged rock constitutive relation by utilizing residual strength
  • Method for establishing damaged rock constitutive relation by utilizing residual strength
  • Method for establishing damaged rock constitutive relation by utilizing residual strength

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Embodiment Construction

[0064] A method for constructing a damaged rock constitutive relationship using residual strength of the present invention will be described in detail below in conjunction with the accompanying drawings. The method includes the following process steps:

[0065] (1) Carry out indoor triaxial compression tests on rocks. The minimum confining pressure of the triaxial compression test starts from zero and ends at the maximum value to half of the uniaxial compressive strength of the rock. Ladder layout is carried out, and the effective data of the test is not less than 5 groups . Measure the axial pressure σ of the rock sample 1 , confining pressure σ 3 , peak strength strain ε 1c , residual strength σ r , to calculate the rock elastic modulus E and Poisson's ratio μ. When calculating the elastic modulus E, the following formula is used:

[0066] E=(σ 1 -σ 3 ) (50) / ε h(50)

[0067] Where: (σ 1 -σ 3 ) (50) is 50% of the actual principal stress difference, in Pa; ε h(5...

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Abstract

The invention relates to a method for establishing damaged rock constitutive relation by utilizing residual strength. The method comprises the following steps of: carrying out a rock indoor triaxial compression experiment, measuring the axle load sigma1, the confining pressure sigma 3, the peak value intensity strain Epsilon 1c and the residual intensity sigma r of a rock sample, calculating the rock elastic modulus E and poisson ratio Mu, carrying out data regression according to triaxial compression test results, and calculating the uniaxial compressive strength sigma ci and an experience intensity parameter mi of a rock block; then establishing a three-dimensional damage statistic constitutive relation capable of reflecting a rock post-peak softening characteristic; and finally, solving constitutive relation parameters n and F0 according to four boundary conditions of a rock full-stress-strain curve geometric characteristic, and drawing a constitutive relation curve by utilizing Matlab software. The constitutive relation can fully reflect rock post-peak softening and residual intensity characteristics, and can describe the full-stress-strain relation of the rock damage process well, so that a theory formula well corresponds to the actual condition of a rock material; and the method can be realized simply, is widely applied to the theory analysis of the rock material, and has an actual value.

Description

technical field [0001] The invention relates to a method for constructing the constitutive relation of damaged rock, in particular to a method for constructing the constitutive relation of damaged rock by using residual strength. Background technique [0002] The constitutive relationship is a mathematical relationship that characterizes the mechanical properties of materials. In order to predict the mechanical response of an object under load, it is necessary to determine the constitutive relation of the constituent materials of the object. The constitutive relationship is the theoretical basis for studying the mechanical properties of materials. [0003] Rock is a heterogeneous material with original damage and defects, and the macroscopic failure phenomenon of rock can be regarded as the superposition of the average effect of many microscopic failures. [0004] There are mainly two ways to construct the rock damage constitutive relationship in the existing technical sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
Inventor 曹瑞琅朱江贺少辉陈庆才
Owner BEIJING JIAOTONG UNIV
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