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Method for improving structural plane shear damage constitutive model of Harris distribution

A constitutive model and structural surface technology, applied in the direction of applying stable shear force to test the strength of materials, analyzing materials, measuring devices, etc., can solve the problems of reducing model applicability, lack of clear physical meaning, complex expressions, etc.

Active Publication Date: 2020-04-10
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these established constitutive models still have some shortcomings, such as complex expressions, numerous parameters and no clear physical meaning, etc.
Theoretical results of most models are in poor agreement with post-peak experimental data, which greatly reduces the applicability of the models

Method used

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  • Method for improving structural plane shear damage constitutive model of Harris distribution
  • Method for improving structural plane shear damage constitutive model of Harris distribution
  • Method for improving structural plane shear damage constitutive model of Harris distribution

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Experimental program
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Effect test

Embodiment 1

[0071] S1. According to the damage statistics theory, based on the improved Harris distribution to represent the strength statistical distribution of the rock micro-elements, the damage variable D of the rock structural plane is derived; the specific derivation process is as follows:

[0072] S1.1. Before the appearance of macroscopic cracks in the material deformation under load, the damage has already had an impact on the mechanical properties of the material. When the size of the crack is relatively small compared to the size of the engineering rock mass, the joints and cracks can be ideally simplified as the damage of the rock mass, and can be studied through the theory of damage mechanics. When the micro-elements of the rock are subjected to external loads or the environment changes drastically, micro-cracks will gradually initiate and expand, and finally macro-cracks will appear, leading to the overall failure of the rock; from a macro perspective, micro-factors reduce th...

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Abstract

The invention discloses a method for improving a structural plane shear damage constitutive model of Harris distribution. The model can reflect a shear stress-shear displacement relationship of a rockstructural plane and particularly is more reasonable in the description of a linear elasticity stage, a pre-peak softening stage, a post-peak softening stage and a residual shear stress stage. Modelparameters provided by the invention can be determined by a mathematical method, so that the method has definite physical significance, and the precision and the preciseness are better than those of afitting method; compared with test data and previous models, the model provided by the invention can accurately reflect the change trend of the structural plane shear stress-shear displacement curve,the description of the curve is more complete, and the superiority and applicability of the model are reflected.

Description

technical field [0001] The invention belongs to the engineering technical field of shear constitutive models of rock structural planes, and relates to a method for improving the shear damage constitutive models of structural planes distributed by Harris. Background technique [0002] Structural plane is a common geological phenomenon in rock mass, which has a profound impact on the stability and long-term deformation of rock mass engineering such as underground caverns and slope engineering. How to evaluate the shear mechanical behavior of structural surfaces under complex loads is a basic problem that must be considered in almost all major designs involving tunnels, slopes or underground excavations in rock mass engineering. [0003] Previous studies on the mechanical properties of rock structural surfaces mostly focused on strength characteristics and shear deformation characteristics. Since Goodman and Taylor first proposed the joint element finite element modeling metho...

Claims

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Application Information

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IPC IPC(8): G01N3/24G01N3/06
CPCG01N3/06G01N3/24G01N2203/0075G01N2203/0218G01N2203/0676G01N2203/0682
Inventor 林杭谢世杰陈怡帆雷大星曹日红雍睿杨横涛杜时贵
Owner CENT SOUTH UNIV
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