A Method for Improving the Constitutive Model of Shear Damage of Structural Plane with Harris Distribution

A constitutive model and structural surface technology, applied in the direction of applying stable shear force to test material strength, analyze materials, instruments, etc. Complete, well-defined effects of physical meaning

Active Publication Date: 2021-08-27
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.
The 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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  • A Method for Improving the Constitutive Model of Shear Damage of Structural Plane with Harris Distribution
  • A Method for Improving the Constitutive Model of Shear Damage of Structural Plane with Harris Distribution
  • A Method for Improving the Constitutive Model of Shear Damage of Structural Plane with Harris Distribution

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Embodiment 1

[0071] S1. According to the theory of damage statistics, based on the improved Harris distribution to represent the statistical distribution of the strength of rock micro-elements, the damage variable D of rock structural planes 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 quite 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 the research can be carried out 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-fa...

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Abstract

The invention discloses a method for improving the shear damage constitutive model of the structural plane of Harris distribution. The model of the invention can reflect the shear stress-shear displacement relationship of the rock structural plane; especially for the linear elastic stage and the pre-peak softening stage , the post-peak softening stage and the description of the residual shear stress stage are more reasonable. The model parameters proposed by the present invention can be determined by mathematical methods, have clear physical meaning, and the accuracy and rigor are better than the fitting method; by comparing with the experimental data and previous models, the model proposed in this paper can accurately reflect the structural surface The variation trend of the shear stress-shear displacement curve is a more complete description of the curve, reflecting the superiority and applicability of the model.

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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Patent Type & Authority Patents(China)
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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