CN112985960A - Preparation method and device of three-dimensional curved surface fractured rock-like sample with any shape - Google Patents
Preparation method and device of three-dimensional curved surface fractured rock-like sample with any shapeDownload PDFInfo
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- CN112985960A CN112985960ACN202110076613.3ACN202110076613ACN112985960ACN 112985960 ACN112985960 ACN 112985960ACN 202110076613 ACN202110076613 ACN 202110076613ACN 112985960 ACN112985960 ACN 112985960A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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Abstract
Translated fromChinese
Description
Technical Field
The disclosure belongs to the technical field of rock mass engineering, and particularly relates to a three-dimensional curved surface fracture rock-like sample preparation method and device based on 3D printing, which are particularly suitable for experimental research of cross-scale rock fractures considering changes of average opening degree of joint fractures and roughness influence.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Under the action of long-term stress, cracks widely exist in the natural rock mass. In the process of rock mass excavation, under the influence of tectonic stress and artificial disturbance, micro cracks, holes, cracks and joints in the rock mass are expanded, developed and run through to form a macroscopic structure surface, so that the mechanical properties of the rock are changed, and the stability of rock mass engineering and underground engineering is influenced.
The actual fracture shapes and spatial positions are complex and various, and due to the difficulties in developing the three-dimensional fracture test, most researchers generally simplify and process the fractures into rectangular, elliptical or circular slices with flat surfaces, and the fractures can be collectively called as plane fractures. However, both the CT scan from the rock internal information, and the fracture surface information scan of the rock after loading damage show: the situation of a real fracture is more complex than that of a plane fracture, and omission and limitation occur when the three-dimensional morphological characteristics of the fracture are reflected by the plane fracture inevitably.
At present, some domestic and foreign researches begin to pay attention to the three-dimensional appearance of the fracture, but generally only consider the three-dimensional state of the fracture space position, such as the position three-dimensionality of an elliptical fracture in the center of a rock sample, and the simulation of the three-dimensional appearance of the fracture is not realized. The research on the spatial position of the crack is limited to a plane crack, so that the angle control of an inserted steel sheet or a straight filling type crack is mostly adopted during the control, and the control of the three-dimensional crack angle is rare.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a device for preparing a three-dimensional curved surface fissure rock-like sample in any shape based on 3D printing, and solves the practical problems of three-dimensionality of the fissure and easy adjustment of the spatial position of the fissure.
In a first aspect, the present disclosure provides a method for preparing a three-dimensional curved surface fissure rock-like sample in any shape, including:
establishing a three-dimensional curved surface model of the crack and a three-dimensional curved surface model of the sample mold;
obtaining a three-dimensional fracture and a sample mold through 3D printing based on the three-dimensional curved surface model of the fracture and the three-dimensional curved surface model of the sample mold;
and manufacturing a three-dimensional curved surface fracture rock-like sample in any shape by using the three-dimensional fracture and the sample mold and filling materials.
In a second aspect, the disclosure also provides a device for preparing a three-dimensional curved surface fractured rock-like sample in any shape, which comprises a three-dimensional fracture and a sample mold, wherein the three-dimensional fracture and the sample mold are both prepared by the method for preparing the three-dimensional curved surface fractured rock-like sample in any shape according to the first aspect.
Compared with the prior art, this disclosure possesses following beneficial effect:
1. the method comprises the steps of establishing a three-dimensional curved surface model of a crack and a three-dimensional curved surface model of a sample mold; obtaining a three-dimensional fracture and a sample mold through 3D printing based on the three-dimensional curved surface model of the fracture and the three-dimensional curved surface model of the sample mold; and manufacturing a three-dimensional curved surface fracture rock-like sample in any shape by using the three-dimensional fracture and the sample mold and filling materials. The surface morphology of the three-dimensional fracture is accurately controlled through a function, and the three-dimensional design of the fracture is realized; the upper edge baffle and the lower edge baffle with specific sizes are fixed on the upper disc and the lower disc of the rough fracture, so that a smooth and stable boundary is provided for multiphase flow in a fracture space, and the preparation of a three-dimensional curved surface fracture rock sample with any shape is realized.
2. The device comprises a base, and a sample mold which comprises a side wall and a top plate connected with the base; the base, the side wall and the top plate are installed to form a closed sealing body; the preparation of the three-dimensional curved surface crack rock-like sample with any shape can be realized in the sealing body, the preparation of the three-dimensional curved surface crack with any shape is realized by utilizing a 3D printing technology, the upper edge baffle plate and the lower edge baffle plate are used as supports, and the rigid gaskets with different specifications and thicknesses are placed between the baffle plates, so that the average opening degree of the rough cracks is accurately changed.
Advantages of additional aspects of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a flow chart of a method for preparing a three-dimensional curved surface fractured rock-like sample according to the disclosure;
fig. 2 is a 3D printing mold base of the present disclosure;
FIG. 3 is a 3D printing die fracture clamping slot of the present disclosure;
fig. 4 is a third sidewall of a 3D printing mold of the present disclosure;
fig. 5 is a second sidewall of a 3D printing mold of the present disclosure;
fig. 6 is a first sidewall of a 3D printing mold of the present disclosure;
fig. 7 is a fourth sidewall of a 3D printing mold of the present disclosure;
fig. 8 is a 3D printing mold rollover ceiling of the present disclosure;
FIG. 9 is a 3D printed arbitrary shaped three-dimensional curved surface crack of the present disclosure;
FIG. 10 is a drawing of a 3D crevice and outer mold assembly of the present disclosure;
wherein, 1, a first side wall mounting groove of the base; 2. a second sidewall mounting groove of the base; 3. a third side wall mounting groove of the base; 4. a fourth side wall mounting groove of the base; 5. printing a mold crack clamping groove; 6. a third side wall; 7. a second side wall; 8. a first side wall; 9. a fourth side wall; 10. and (5) turning over a mould top plate.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1
As shown in fig. 1, a method for preparing a three-dimensional curved surface fissure rock-like sample in any shape comprises the following steps:
establishing a three-dimensional curved surface model of the crack and a three-dimensional curved surface model of the sample mold;
obtaining a three-dimensional fracture and a sample mold through 3D printing based on the three-dimensional curved surface model of the fracture and the three-dimensional curved surface model of the sample mold;
and manufacturing a three-dimensional curved surface fracture rock-like sample in any shape by using the three-dimensional fracture and the sample mold and filling materials.
Further, the step of establishing the three-dimensional curved surface model of the fracture and the three-dimensional curved surface model of the sample mold comprises the steps of establishing coordinates to obtain a space coordinate position of the fracture through a plurality of CT scanning results of internal information of the rock, guiding the space coordinate position into Excel or Origin to process and obtain a curve function of the surface of the fracture, scattering a curve of the curve function into a node form in the Excel, and converting a space point determined in the Excel into a space curved surface in the CAD by utilizing the connection function of the Excel and the CAD so as to establish the three-dimensional curved surface model of the fracture.
Further, the three-dimensional curved surface model of the crack and the three-dimensional curved surface model of the sample mold are established in a three-dimensional mode through 3D modeling software, so that the three-dimensional curved surface model of the crack and the three-dimensional curved surface model of the sample mold are drawn; the 3D modeling software may be CAD or soildfields software. The three-dimensional software carries out three-dimensional modeling based on EXCEL given data, and model parameters can be adjusted by adjusting the EXCEL data.
Further, the form of the three-dimensional curved surface crack with any shape is accurately controlled by utilizing a curved surface function of the surface of the three-dimensional curved surface crack with any shape; the surface function of the three-dimensional curved surface fracture surface with the arbitrary shape is Z ═ Asin (omega 1x) sin (omega 2y), wherein A is amplitude, omega 1 and omega 2 are angular frequencies in the x-Z direction and the y-Z direction respectively, and the three parameters are adjustable.
Furthermore, the sample mold is provided with an angle adjusting mechanism mounting hole, and the sample mold is connected with the angle adjusting mechanism through the angle adjusting mechanism mounting hole.
Preparing a three-dimensional curved surface fissure rock-like sample in any shape by using the three-dimensional fissure and the sample mould through a filling material, wherein the step of connecting the sample mould with the three-dimensional fissure through an angle adjusting mechanism is included;
adjusting the three-dimensional crack to a proper angle by using an angle adjusting mechanism;
the filling material is used for preparing the three-dimensional curved surface fissure rock-like sample in any shape.
Furthermore, the sample mold is provided with an angle adjusting mechanism mounting hole, the sample mold is connected with the three-dimensional crack through the angle adjusting mechanism, the spatial position of the crack in the sample can be changed through the angle adjusting mechanism designed on the sample mold, simulation of the crack filled with different materials can be achieved through changing printing materials or filling with different materials in the crack mold, and the sample materials can also be replaced under corresponding molds. Specifically, the sample mold is connected with one end of an angle adjusting mechanism, and the other end of the angle adjusting mechanism is connected with the three-dimensional crack; the angle adjusting mechanism can be a gear transmission structure, and the three-dimensional crack position is adjusted by rotating the gear transmission structure; as another embodiment, the angle adjusting mechanisms are two circular knobs in the side wall, the knobs can be manually rotated by a tool with a proper size like a Chinese character 'yi', the three-dimensional cracks are inserted after the angle is adjusted, the rotating buttons can be replaced by rotating shafts, specifically, the angle adjusting mechanisms are two rotating shafts, and the positions of the three-dimensional cracks are adjusted by rotating the rotating shafts; as another embodiment, the angle adjusting mechanism is a worm gear structure, and the three-dimensional crack position is adjusted by rotating a worm gear; as one embodiment, the angle adjusting mechanism is a universal joint structure, the universal joint is fixed in position by a fixing piece, and the position can be adjusted after the fixing piece is loosened, so that the position of the three-dimensional crack can be adjusted.
Further, the material can be cement mortar, and the material can be filled in a pouring mode.
Example 2
The invention also provides a device for preparing the three-dimensional curved surface fractured rock-like sample in any shape, which comprises a three-dimensional fracture and a sample mold, wherein the three-dimensional fracture and the sample mold are prepared by the preparation method of the three-dimensional curved surface fractured rock-like sample in any shape according to the embodiment.
Further, the sample mold comprises a base, a side wall and a top plate, wherein the side wall and the top plate are connected with the base; the base, the side wall and the top plate are installed to form a closed sealing body; and the preparation of the three-dimensional curved surface fissure rock-like sample with any shape can be realized in the sealing body.
The base is provided with a mounting groove and is connected with the side plate through the mounting groove.
The side wall comprises a first side wall, a second side wall, a third side wall and a fourth side wall which are sequentially matched and installed, wherein the second side wall and the third side wall are respectively provided with a side wall installation groove, and the installation grooves are used for connecting the first side wall and the fourth side wall. Wherein the side wall mounting grooves are respectively arranged at the edge of one side surface. The side wall mounting groove is for with side wall complex shape, can be the rectangular channel, or cylindrical groove, one of them embodiment of this application is the rectangular channel.
And the bottom plate is provided with a first side wall mounting groove, a second side wall mounting groove, a third side wall mounting groove and a fourth side wall mounting groove which are respectively used for mounting the first side wall, the second side wall, the third side wall and the fourth side wall.
One side wall is provided with a crack clamping groove and is used for being connected with one end of the three-dimensional crack, and the other end of the three-dimensional crack is connected with the angle adjusting structure; the angle adjusting mechanism is installed on the other side wall opposite to the side wall.
Furthermore, a crack clamping groove is formed in the third side wall, and an angle adjusting mechanism mounting hole is formed in the fourth side wall.
Further, upper edge baffles with specific sizes are fixedly installed on the edges of the two sides of the upper disc in the three-dimensional fracture, and lower edge baffles with specific sizes are fixed on the edges of the two sides of the lower disc; the upper edge baffle and the lower edge baffle are used for supporting, and rigid gaskets with different specifications and thicknesses are placed between the baffles, so that the average opening degree of the three-dimensional fracture is accurately changed. The three-dimensional fractures are rough fractures.
The preparation process of the preparation device for the three-dimensional curved surface fissure rock sample with any shape is as follows:
firstly, thethird side wall 6 and the fourth side wall 7 are respectively arranged at thepositions 3 and 4 in the figure 1, the space direction of the three-dimensional crack is adjusted by rotating theknob 5 in the figure 2, and after the crack, thethird side wall 6 and the fourth side wall 7 are installed, thefirst side wall 8 and the second side wall 9 are respectively arranged at thepositions 1 and 4 in the first base in the figure. And finally, pouring a molding material to cover thetop plate 10, thereby obtaining the three-dimensional curved surface fissure rock sample with any shape.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. A preparation method of a three-dimensional curved surface fissure rock sample in any shape is characterized by comprising the following steps:
establishing a three-dimensional curved surface model of the crack and a three-dimensional curved surface model of the sample mold;
obtaining a three-dimensional fracture and a sample mold through 3D printing based on the three-dimensional curved surface model of the fracture and the three-dimensional curved surface model of the sample mold;
and manufacturing a three-dimensional curved surface fracture rock-like sample in any shape by using the three-dimensional fracture and the sample mold and filling materials.
2. The method for preparing a three-dimensional curved fractured rock-like sample according to claim 1, wherein the step of establishing the three-dimensional curved model of the fracture and the three-dimensional curved model of the sample mold includes obtaining a curve function of the surface of the fracture and establishing the three-dimensional curved model of the fracture using the curve function.
3. The method for preparing a three-dimensional curved fractured rock-like sample according to claim 1, wherein the three-dimensional curved surface model of the fracture and the three-dimensional curved surface model of the sample mold are three-dimensionally modeled by 3D modeling software.
4. The method for preparing the three-dimensional curved surface fractured rock-like sample as recited in claim 1, wherein upper edge baffles with specific dimensions are fixedly installed on two side edges of an upper disc of the three-dimensional fracture, and lower edge baffles with specific dimensions are fixed on two side edges of a lower disc of the three-dimensional fracture; and a rigid gasket is arranged between the upper edge baffle and the lower edge baffle and is used for adjusting the average opening degree of the three-dimensional crack.
5. The method for preparing the three-dimensional curved surface fractured rock-like sample as recited in claim 1, wherein the sample mold is provided with an angle adjusting mechanism mounting hole, and the sample mold is connected with the angle adjusting mechanism through the angle adjusting mechanism mounting hole.
6. The method for preparing a three-dimensional curved surface fractured rock-like sample according to claim 5, wherein the three-dimensional fractures and the sample mold are used for preparing the three-dimensional curved surface fractured rock-like sample in any shape by filling materials, and the method comprises the steps of connecting the sample mold with the three-dimensional fractures through an angle adjusting mechanism;
adjusting the three-dimensional crack to a proper angle by using an angle adjusting mechanism;
the filling material is used for preparing the three-dimensional curved surface fissure rock-like sample in any shape.
7. An arbitrary-shaped three-dimensional curved surface fractured rock-like sample preparation device is characterized by comprising a three-dimensional fracture and a sample mold, wherein the three-dimensional fracture and the sample mold are prepared by the arbitrary-shaped three-dimensional curved surface fractured rock-like sample preparation method according to any one of claims 1 to 6.
8. The apparatus according to claim 7, wherein the sample mold comprises a base, and further comprises a side wall and a top plate connected to the base; the base, the side wall and the top plate are installed to form a closed sealing body; and the preparation of the three-dimensional curved surface fissure rock-like sample with any shape can be realized in the sealing body.
9. The apparatus for preparing the three-dimensional curved surface fissured rock-like sample according to claim 8, wherein the side walls comprise a first side wall, a second side wall, a third side wall and a fourth side wall which are sequentially installed in a matched manner.
10. The device for preparing the three-dimensional curved surface fractured rock-like sample as recited in claim 8, wherein one of the side walls is provided with a fracture clamping groove for connecting with one end of the three-dimensional fracture, and the other end of the three-dimensional fracture is connected with the angle adjusting structure; the angle adjusting mechanism is installed on the other side wall opposite to the side wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110076613.3ACN112985960A (en) | 2021-01-20 | 2021-01-20 | Preparation method and device of three-dimensional curved surface fractured rock-like sample with any shape |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110076613.3ACN112985960A (en) | 2021-01-20 | 2021-01-20 | Preparation method and device of three-dimensional curved surface fractured rock-like sample with any shape |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933122A (en)* | 2021-10-11 | 2022-01-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for manufacturing three-dimensional axisymmetric smooth curved internal crack |
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- 2021
- 2021-01-20CNCN202110076613.3Apatent/CN112985960A/enactivePending
Patent Citations (5)
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| US20040141043A1 (en)* | 2003-01-16 | 2004-07-22 | Kia Silverbrook | 3-D product printing system with a foreign object incorporation facility |
| CN102053036A (en)* | 2010-11-12 | 2011-05-11 | 中国水利水电科学研究院 | Experimental design method and device for simulating high-pressure water fracturing of concrete member in tension/compression state |
| CN105158039A (en)* | 2015-09-08 | 2015-12-16 | 河海大学 | Manufacturing method of simulation fracture for fractured rock mass seepage test |
| CN105277406A (en)* | 2015-11-03 | 2016-01-27 | 中国建筑股份有限公司 | Mold for producing cracked rock test piece of different dip angles and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113933122A (en)* | 2021-10-11 | 2022-01-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for manufacturing three-dimensional axisymmetric smooth curved internal crack |
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