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A Method for Measuring Rock Damage Parameters Based on Triaxial Compression Test

A damage parameter, triaxial compression technology, applied in the direction of using stable tension/pressure test material strength, measuring device, instrument, etc., can solve the problem of excessive damage parameter error, large influence of rock strength, and insufficient distinction between cracks Problems such as different mechanisms of surface contact force, tension and compression force, to achieve the effect of improved fitting accuracy and high accuracy

Active Publication Date: 2020-08-18
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0026] (1) In the prior art, the parameters of the statistical damage constitutive model were calculated by fitting and calculating the statistical damage constitutive model by the triaxial compression test, without distinguishing the stress state of tensile shear and compressive shear damage, and not fully distinguishing the mechanism of the different forms of tensile and compressive force of the crack surface contact force
[0027] (2) The error of the damage parameters obtained by the prior art fitting is too large
[0028] (3) In the prior art, the effect of damage on the effective confining pressure is neglected in the fitting calculation, and the effective confining pressure is calculated when calculating the parameters myopia 2 , but the actual confining pressure has a great influence on the rock strength, this approximation is unreasonable

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  • A Method for Measuring Rock Damage Parameters Based on Triaxial Compression Test

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[0058] In order to make the object, technical solution and advantages of the present invention clearer, the following examples are given to further describe the present invention in detail.

[0059] A Method for Measuring Rock Damage Parameters Based on Triaxial Compression Test

[0060] Assuming that the triaxial compression test of the rock is considered, the axial compression σ is applied to the rock sample 1 , confining pressure σ 2 = σ 3 .

[0061] According to the rock statistical damage constitutive model corrected according to the state of tensile shear and compressive shear stress, the basic constitutive parameters contained in the model include: elastic modulus E, Poisson's ratio v, viscosity coefficient c, internal friction angle Damage parameters m and F 0 . where E, v, c and The value of can be calculated according to the standard rock mechanics test design rules (the design rule is the national standard of the People's Republic of China: Engineering Rock ...

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Abstract

The invention discloses a method for determining rock damage parameters based on a triaxial compression test. The method is based on a damage counting constitutive model of a rock, the difference between two damage stress states of tension shear and compression shear is distinguished by the specifically adopted damage counting constitutive model and the damage parameters of fitting evaluation, andthe stress and strain data in the fracturing process of the rock obtained by the triaxial compression test are specifically given aiming at the damage parameters m and F0 under the damage stress states of tension shear and compression shear to evaluate the formula and the process of the two rock damage parameters. The method has the advantages that a basic model derived by the fitting evaluationformula is more conformed to a correct mechanical mechanism; the precision of the evaluated damage parameters is higher, and the obtained parameters are more reasonable on the mechanical mechanism ofthe model. By means of the method, higher improvement is made on the fitting accuracy of a stress-strain curve of the corrected model.

Description

technical field [0001] The invention relates to the technical field, in particular to a method for measuring rock damage parameters based on a triaxial compression test. Background technique [0002] Prior art literature: Cao Wengui, Fang Zulie. Research on Statistical Constitutive Model of Rock Damage and Softening. Journal of Rock Mechanics and Engineering, 1998,17(6):628-633. [0003] Li Shuchun, Xu Jiang, Wang Hong, et al. Research on Statistical Constitutive Model of Rock Damage and Its Parameter Determination. Mining Research and Development, 2007,27(2):6-8. [0004] Based on the micro-element strength model of rock, the above-mentioned literatures established a statistical damage constitutive model reflecting rock fracture failure behavior by using the micro-element strength to obey the Weibull distribution and the Lemaitre strain equivalence hypothesis. The statistical damage method has the advantages of simple model, small amount of calculation, and easy access to ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0019G01N2203/0256
Inventor 万柯赵建军廖小芳余建乐
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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