Filling type fracture network rock test piece preparing method based on 3D printing technology

A technology of fracture network and rock specimen, which is applied in the preparation of test samples, manufacturing tools, ceramic molding machines, etc., can solve the problem of difficulty in preparing rock mass models, etc.

Inactive Publication Date: 2019-04-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for rock masses with more complex structures, it is difficult to prepare rock mass models with complex structural features and internal defects using traditional manual sample preparation methods, such as the production of test specimens containing geological structures and cavern excavation models, etc. , the defects contained in these rock masses play an important role in the destruction of the rock mass, so how to repeatedly prepare a similar model of the complex structural rock mass is one of the keys to the physical model test, and it is also the basis for the study of complex engineering rock mass

Method used

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  • Filling type fracture network rock test piece preparing method based on 3D printing technology
  • Filling type fracture network rock test piece preparing method based on 3D printing technology
  • Filling type fracture network rock test piece preparing method based on 3D printing technology

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Embodiment 1

[0034] Embodiment 1: as Figure 1-3 Shown, a kind of filling type fracture network rock specimen preparation method based on 3D printing technology, described preparation method comprises the following steps:

[0035] Step 1: Collect enough fracture shape and distribution characteristic data, use matlab software to write the corresponding model code, construct a three-dimensional random fracture network model, set the model size length × width × height = 10 × 10 × 20 cm, and build the model Such as figure 2 shown;

[0036] Step 2: Import the model file obtained in Step 1 into AutoCAD software and convert it into a corresponding SLT file;

[0037] Step 3: Import the SLT file into the 3D printer, and set the parameters of the 3D printer such as printing speed, printing layer, printing filling degree, printing nozzle temperature, printing material, and the distance z-offset between the nozzle and the platform; the printing speed is, the printing layer is 0.2 mm, the printing ...

Embodiment 2

[0046] Embodiment 2: as Figure 1-3 As shown, a method for preparing a filled fracture network rock specimen based on 3D printing technology, this embodiment is the same as Embodiment 1, the difference is:

[0047] Further, the steps 1 and 2 can be replaced by: collecting enough crack shape and distribution characteristic data, using matlab software to write corresponding model codes, first constructing a two-dimensional random crack network model, and then converting the two-dimensional random crack network model to Import it into AutoCAD, use the Region command to generate the fracture area, and then use the Extrude command to stretch the area to obtain the corresponding 3D fracture network model, and then output it as an SLT file.

[0048] Further, in the step five, the number of times the waterproof paint is applied is 3 times, and the application thickness is 0.4 mm;

[0049] Further, Step 7: Put the cement mortar specimen obtained in Step 6 together with the steel mold ...

Embodiment 3

[0051] Embodiment 3: as Figure 1-3 As shown, a method for preparing a filled fracture network rock specimen based on 3D printing technology, this embodiment is the same as Embodiment 1, the difference is:

[0052] Further, the steps 1 and 2 can be replaced by: collecting enough crack shape and distribution characteristic data, using matlab software to write corresponding model codes, first constructing a two-dimensional random crack network model, and then converting the two-dimensional random crack network model to Import it into AutoCAD, use the Region command to generate the fracture area, and then use the Extrude command to stretch the area to obtain the corresponding 3D fracture network model, and then output it as an SLT file.

[0053] Further, in the step five, the number of times the waterproof paint is applied is 3 times; the application thickness is 0.45 mm;

[0054] Further, Step 7: Put the cement mortar specimen obtained in Step 6 together with the steel mold int...

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Abstract

The invention relates to a filling type fracture network rock test piece preparing method based on the 3D printing technology, and belongs to the related technical field of construction, hydraulic engineering, mining and other underground project tests. According to the filling type fracture network rock test piece preparing method based on the 3D printing technology, firstly, a three-dimensionalrandom fracture network model is constructed; the obtained model is converted into an SLT file; the SLT file is guided into a 3D printer; the 3D printer is used for printing the three-dimensional random fracture network model; the outer surface of the model is coated with a waterproof coating; the three-dimensional random fracture network model is placed in a steel die, cement mortar is poured into the steel die containing the three-dimensional random fracture network model, and uniform vibration is conducted; and a cement mortar test piece and the steel die are placed in a standard curing boxtogether; then the three-dimensional random fracture network model is degraded; and the degraded test piece is placed in the standard curing box again to be cured, the cured test piece three-dimensional random fracture is filled with needed materials, and finally a filling type fracture network rock test piece is obtained.

Description

technical field [0001] The invention relates to a method for preparing a filling-type fracture network rock test piece based on 3D printing technology, and belongs to the related technical fields of underground engineering tests such as civil engineering, water conservancy and mining. Background technique [0002] In underground engineering such as civil engineering, water conservancy, and mining, weak structural surfaces of different scales and characteristics are often involved, which control the mechanical behavior of rock mass and bring great safety and stability problems to underground engineering construction. At present, scholars have conducted in-depth research on single-fracture rocks, revealing the mechanical properties and failure characteristics of single-fracture rocks. However, complex rock mass contains a large number of criss-cross joints and fissures of different shapes, and the spatial distribution of structural planes often presents a randomly distributed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B7/34B28B11/24B33Y10/00B33Y50/00G01N1/36
CPCB28B7/342B28B7/346B28B11/245B33Y10/00B33Y50/00G01N1/36
Inventor 张科刘享华李昆
Owner KUNMING UNIV OF SCI & TECH
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