Quantitative classification method for rock sample crushing degree based on grid density and crack density

A technology of grid density and crack density, applied in the field of rock mechanics test, can solve the problems of difficult rock mechanical properties, inability to quantitatively compare failure states, lack of quantitative index descriptions for crack development and fracture degree of rock samples, etc. Intuitive calculation results and accurate values

Inactive Publication Date: 2017-05-10
CHINA THREE GORGES UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, in the literature, reports and books about the failure state of rock samples after mechanical tests, they are usually only qualitatively called "relatively broken", "broken", etc., and there is no quantitative index description for the development of cracks and the degree of fracture of rock samples. , the same or different types of rocks, or the failure states of rock samples with different loading and unloading stress paths cannot be compared quantitatively, which brings great difficulties to the description of rock mechanical properties

Method used

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  • Quantitative classification method for rock sample crushing degree based on grid density and crack density
  • Quantitative classification method for rock sample crushing degree based on grid density and crack density
  • Quantitative classification method for rock sample crushing degree based on grid density and crack density

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Embodiment 1

[0060] A method for quantitatively classifying rock sample fragmentation degree based on grid density and crack density, the method comprises the following steps:

[0061] Step 1: Combining the literature data and a large number of sandstone, limestone, granite, sandstone, gneiss and other types of rocks completed in the laboratory in the early stage, the rock samples were destroyed under different loading and unloading stress paths, a total of 200 groups; 200 samples were obtained The crack development diagram of rock samples of the same size after failure, such as figure 1 shown;

[0062] Step 2: Make a "360 grid" of each rock sample, and count the number of cracks in each crack development diagram obtained in step 1 through the "360 grid". Statistics are shown in Table 1:

[0063] Table 1 Statistical table of the number of cracks in rock samples

[0064]

[0065] Draw the relationship diagram between the number of cracks and the number of corresponding rock samples, s...

Embodiment 2

[0117] In order to verify the applicability and rationality of the classification method proposed by the present invention, a typical damaged rock sample is selected, and the rock sample fragmentation degree is calculated and evaluated according to the above method;

[0118] Depend on Figure 9 It can be seen that: 360 grid density Γ W is 0.08 (0J It is 0.2 (0<0.2<0.5), the category of rock sample fragmentation degree: relatively complete.

[0119] Depend on Figure 10 It can be seen that: 360 grid density Γ W 0.19 (0.1J It is 0.55 (0.5<0.55<0.8), and the category of rock sample fragmentation degree: relatively fragmented.

[0120] Depend on Figure 11 It can be seen that: 360 grid density Γ W is 0.42 (0.3J 0.95 (0.8<0.95<1.0), rock sample fragmentation category: fragmentation.

[0121] Depend on Figure 12 It can be seen that: 360 grid density Γ W 0.51 (0.5J It is 1.2 (1.2>1), and the rock sample fragmentation category: very fragmented.

[0122] Depend on Figure 13...

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Abstract

The invention aims to provide a quantitative classification method for rock sample crushing degree based on grid density and crack density, wherein the method can meet quantitative analysis requirements of destroy characteristics and crushing degree of rock samples. The method includes the steps: firstly, acquiring crack expansion diagrams; secondly, making '360 grids'; thirdly, drawing relationship diagrams among 360 grid density gamma W subsections and corresponding number of rock samples; fourthly, drawing relationship diagrams among the number of cracks and 360 grid density gamma W according to the relationship diagrams obtained in the step 2 and the step 3; fifthly, building classification standards describing the rock sample crushing degree by the 360 grid density gamma W; sixthly, calculating crack density gamma J of the rock samples corresponding to the number of the cracks counted in the step 2; seventhly, building classification standards describing the rock sample crushing degree by the crack density gamma J of the rock samples; eighthly, performing quantitative classification for the rock sample crushing degree by the aid of the gamma W and the gamma J.

Description

technical field [0001] The invention relates to the field of rock mechanics tests in geotechnical engineering, in particular to a method for quantitatively classifying the fracture degree of rock samples based on grid density and crack density. Background technique [0002] Rock mechanics test is the basis of rock mechanics and one of the important means to study rock mechanics and engineering. Although scientific calculation and theoretical analysis have reached a considerable height, rock mechanics tests still play an irreplaceable role in directly solving mechanical problems in practical engineering. With the deepening of research, higher requirements are put forward for the analysis of test results. . [0003] After the rock sample is subjected to uniaxial, triaxial and other mechanical tests, the rock sample will be damaged macroscopically, and several or even dozens of cracks will appear on the surface of the rock sample, and the corresponding rock sample will be deco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
CPCG01N3/00G01N2203/0067
Inventor 邓华锋肖瑶张小景张恒宾张咏钗王伟
Owner CHINA THREE GORGES UNIV
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