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Fractal Evaluation Method for Analyzing Anisotropic Size Effect Characteristics of Rock Mass Discontinuities

An anisotropy and size effect technology, which is applied in the field of fractal evaluation to analyze the anisotropic size effect characteristics of rock mass structural planes, can solve problems such as the inability to realize the fractal evaluation of anisotropic size effect characteristics of rock mass structural planes, and achieve Effect of Size Effect Feature Prediction Evaluation

Active Publication Date: 2022-04-01
SHAOXING UNIVERSITY
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Problems solved by technology

[0005] In order to overcome the deficiency that the prior art cannot realize the fractal evaluation of the anisotropic size effect characteristics of the rock mass structural plane, the present invention provides a fractal evaluation method for analyzing the anisotropic size effect characteristics of the rock mass structural plane. D objectively and truly reflect the size effect law of structural plane anisotropy

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  • Fractal Evaluation Method for Analyzing Anisotropic Size Effect Characteristics of Rock Mass Discontinuities
  • Fractal Evaluation Method for Analyzing Anisotropic Size Effect Characteristics of Rock Mass Discontinuities
  • Fractal Evaluation Method for Analyzing Anisotropic Size Effect Characteristics of Rock Mass Discontinuities

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specific Embodiment approach

[0025] This example is illustrated by the natural structural surface, and the specific implementation method is as follows:

[0026] 1) Use a portable laser scanner (MetraSCAN 3D, Creaform, Canada) to obtain the 3D surface topography data of the structural surface in a large range of sizes, and then intercept the 3D point cloud data of the required research structural surface with a square plane size range of 1000 mm × 1000 mm, such as figure 2 shown;

[0027] 2) Based on the structural surface samples with the initial sampling size of 100mm×100mm and 200mm×200mm obtained by the progressive full coverage statistical method, the calculated sample sizes for the advancing distance of 100mm and the two corresponding sampling sizes are N 1 =100, N 2 =81;

[0028] 3) For 100 structural surface samples with a sampling size of 100mm×100mm, according to the anisotropic variation coefficient AVC 3D The determination method, select the three-dimensional shape parameters Calculate t...

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Abstract

A fractal evaluation method for analyzing the anisotropic size effect characteristics of rock mass discontinuities is based on the anisotropic variation coefficient AVC 3D Proposed, by normalizing the anisotropic variation coefficient and sampling size, it is found that the two present a good linear function relationship, and thus the fractal expression of the anisotropic variation coefficient is used to reflect the anisotropy of the structural plane size effect rule. The present invention combines the anisotropic variation coefficient AVC 3D Acquire the eigenvalues ​​of the fractal dimension to make the research on the anisotropic fractal behavior of the structural plane more representative; use the fractal dimension D that does not change with the scale to analyze the AVC of different sampling sizes 3D , enabling the predictive evaluation of the size-effect characteristics of structural plane anisotropy.

Description

technical field [0001] The invention relates to a fractal evaluation method for analyzing the anisotropic size effect characteristics of a rock mass structural plane, which is suitable for objectively and truly describing the size effect rule of the structural plane anisotropy according to the fractal dimension D. Background technique [0002] For engineering rock mass structural planes, a stable and reasonable scale range is the key to accurately evaluate the strength and direction of mechanical properties of rock mass structural planes. However, the determination of the reasonable scale range of structural planes requires a comprehensive analysis of the size effects in all directions. However, due to the complex anisotropy of the structural surface and the different roughness in different directions, it is difficult to reflect the size effect of anisotropy. [0003] Considering that the fractal method has good adaptability to quantitatively describe irregular objects, phy...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/48G06T7/60G01B11/24
CPCG06T7/48G06T7/60G01B11/24
Inventor 洪陈杰黄曼夏才初罗战友杜时贵马成荣张丹瑜
Owner SHAOXING UNIVERSITY
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