A rock sample manufacturing method capable of reflecting structural plane angle and roughness

Abstract

The application discloses a rock sample manufacturing method capable of reflecting structural plane angle and roughness, comprising a similar material proportioning method and a mold manufacturing method. The similar material proportioning method is performed according to main mineral components of a parent rock, structural plane surface roughness information is obtained through a three-dimensional scanner, a three-dimensional model of a mold is designed by using modeling software, a sample manufacturing mold is obtained by using a 3D printing technology, the lower half of the sample is poured after the mold is assembled, the upper half of the sample is poured after the lower half is finally cured, and thus the rock sample manufacturing containing a structural plane reflecting different angles and roughness information is completed. The application can manufacture rock similar material samples with different structural plane angles and roughnesses in accordance with the standard of the International Society for Rock Mechanics, and the manufacturing method is convenient, fast and accurate, and can help solve the problems that natural structural plane rock samples are not easy to obtain, the cost is high, and it is difficult to meet the repeated test requirements.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of rock sample manufacturing, and particularly discloses a rock sample manufacturing method capable of reflecting structural plane angle and roughness. BACKGROUND

[0002] Rock mass in nature is subjected to complex geological action to generate various structural planes, and research on the mechanical properties and failure mechanism of the structural planes is of great significance to the safe and efficient construction of rock mass engineering. At present, natural joint rock and artificial joint rock samples are mainly used in indoor tests of rock containing structural planes. However, it is difficult to manufacture rock samples containing structural planes that can reflect key information such as structural plane angle and roughness in batches, and it is difficult to meet the needs of indoor test research. Natural joint rock samples are usually difficult to sample and the structural planes are prone to damage during transportation. In addition, only one destructive test can be performed on one sample, the test results have poor repeatability, the cost is high, the mechanical properties have large differences, and the natural joint rock samples are only suitable for the research of a specific project. Artificial joint rock samples are mainly obtained by cutting the original rock and using similar materials to preform gaps. The former cuts the original rock sample to form internal structural planes by using a water jet, a high-speed cutting machine and the like. However, the process of using rock blocks to make structural planes is complex and time-consuming, and the information such as structural plane angle and roughness cannot be accurately reflected. The latter uses preformed regular structural planes such as sawtooth to perform test research, and cannot reflect the true roughness and other information of the structural planes, so there is a large error between the research results and the actual situation.

[0003] 3D printing is a technology for printing a solid model by using a 3D printer with plastic, metal, resin and the like as the material after a three-dimensional digital model is established by using modeling software. A three-dimensional scanner can obtain structural plane information by scanning a rock structural plane, and a rock structural plane mold containing different angle and roughness information can be manufactured by combining the 3D printer, so that the structural plane with different angle and roughness and other geometric parameters in the rock can be accurately reflected.

[0004] In view of the problem, the application provides a new rock sample manufacturing method and device capable of reflecting structural plane angle and roughness. SUMMARY

[0005] To solve the above-mentioned defects of the prior art, the application provides a rock sample manufacturing method capable of reflecting structural plane angle and roughness.

[0006] The technical scheme provided by the application is as follows:

[0007] The rock sample manufacturing method capable of reflecting structural plane angle and roughness comprises the following steps:

[0008] Step 1, obtaining rock structural plane roughness information;

[0009] Step 2, design a sample mold that can reflect different angles and roughness of structural plane, use 3D printing technology to get the sample mold, and analyze the main mineral composition of the parent rock to determine the similar material ratio;

[0010] Step 3, assemble the mold, pour the similar material to obtain a half sample, and then put it into the whole mold for secondary pouring after final setting;

[0011] Step 4, after the sample is demolded, it is cured and post-processed.

[0012] In one possible design, the mold in step 2 includes a lower sleeve, a structural plane reflecting base, and a whole sleeve, the whole sleeve is fixed by an upper fixing ring and a whole sleeve base, the structural plane reflecting base includes a large-angle structural plane reflecting base and a small-angle structural plane reflecting base, the small-angle structural plane reflecting base includes a structural plane reflecting bottom plate and a lower sleeve fixing support A, the structural plane reflecting bottom plate is in close contact with the upper end fixing support A, the large-angle structural plane reflecting base includes a structural plane bottom plate, a bottom surface support, and a fixing support B, and the lower sleeve has an opening with the shortest axis for facilitating sample demolding.

[0013] In one possible design, in step 2, when the parent rock is marble, 80-mesh calcite sand and 120-mesh dolomite sand can be selected as coarse aggregate, 325-mesh calcite powder as fine aggregate, semi-hydrated gypsum and Portland cement as cementing agents, both of which serve as auxiliary materials and have a content much lower than that of the aggregate, and iron powder with a density of 7.8 g / cm 3 is selected as a densifying agent, and distilled water is used for similar material configuration. The similar material ratio is determined by orthogonal test.

[0014] In one possible design, the step of making a three-dimensional model of the mold in step 2 includes,

[0015] First, obtain the grid information of the natural rock mass structural plane: use a three-dimensional scanner to obtain the grid information of the natural rock mass structural plane, and convert the file into a format that can be recognized by modeling software;

[0016] Second, establish a three-dimensional model of the sample mold: use modeling software to establish a structural plane bottom plate with a thickness of A, then establish a lower sleeve with different angles, obtain the long and short axis lengths of the bottom ellipse based on the established lower sleeve, and then establish a bottom ellipse. On the basis of the bottom ellipse, draw an external ellipse to obtain a hollow plane. Set the hollow plane to have a certain thickness B, cut a fixing support A along the short axis length direction to obtain a fixing support A, and cut the lower sleeve along the shortest axis direction to obtain an opening with a thickness of D. Combine the structural plane bottom plate and the fixing support A into a base. In addition, establish a whole sleeve, an upper fixing ring, and a whole sleeve base to obtain a three-dimensional model of the mold.

[0017] Third step, 3D printing: the lower sleeve and base established in the second step are introduced into the corresponding slicing software of the 3D printer, slicing is performed after the parameters are adjusted, and the 3D printer is introduced for printing after the slicing is completed, so that the required mold is obtained.

[0018] In a possible design, in step 2, jointed rock with different roughness can be selected to establish the structural plane bottom plate.

[0019] In a possible design, in step 3, the lower sleeve and the base are fixed as a whole, a release agent is applied on the structural plane bottom plate, similar materials are weighed and uniformly stirred, poured into the mold and fully vibrated on the vibration table, the upper part of the mold is kept horizontal with the ground for 12 hours after the vibration is completed, then demolding is performed, the lower sleeve and the base are separated, a sample C with roughness information of the rock structural plane is obtained, then the sample C obtained by demolding is placed in the whole sleeve, the upper fixing ring and the whole sleeve base are installed, a release agent is applied on the structural plane, and pouring of the other half of the sample is continued.

[0020] In a possible design, in the second step of the mold three-dimensional model manufacturing step of step 2, the structural plane bottom plate thickness A is 4 mm, the fixed support A thickness B is 3 mm, and the thickness D is 0.2 mm.

[0021] In a possible design, in step 3, the sample C has a volume of half of the volume of the whole sample, and the structural plane is fitted with the other half of the structural plane.

[0022] In a possible design, step 4 is specifically that, after 12 hours of pouring in step 3, demolding is performed, the upper fixing ring is removed, and the demolding block on the whole sleeve base is pulled out to demold, and the rock sample with different angles and roughness is obtained after curing for 28 days under standard conditions.

[0023] Compared with the prior art, the advantages of the present application are that:

[0024] The present application can solve the technical problem that the preparation of rock containing structural planes is relatively difficult in the prior art, and can prepare rock similar materials with different structural plane angles and roughnesses in accordance with the international rock mechanics society standard, the preparation method is convenient, fast and accurate, the error of rock similar materials prepared by the same mold is small, repeated tests can be performed, and the problem of difficulty in obtaining natural jointed rock and high cost can be solved by means of 3D printing technology. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a flow chart of rock sample production in the present application;

[0027] Figure 2 is a schematic diagram of the base of each angle in the present application;

[0028] Figure 3 is a schematic diagram of the lower sleeve of each angle in the present application;

[0029] Figure 4 is a schematic diagram of the lower sleeve of 45° in the present application;

[0030] Figure 5 is a schematic diagram of the bottom ellipse and the outer ellipse of 45° in the present application;

[0031] Figure 6 is a schematic diagram of the overall sleeve in the present application;

[0032] Figure 7 is a schematic diagram of the overall sleeve fixing ring in the present application;

[0033] Figure 8 is a schematic diagram of the overall sleeve base in the present application;

[0034] Figure 9 is a side view of the base of 75° in the present application;

[0035] Figure 10 is a side view of the base of 90° in the present application;

[0036] Figure 11 is a front view of the base of 75° in the present application;

[0037] Figure 12 is a front view of the base of 90° in the present application. DETAILED DESCRIPTION

[0038] Legend: 1-structural plane bottom plate, 2-lower sleeve, 3-major axis, 4-minor axis, 5-bottom ellipse, 6-outer ellipse, 7-fixing support A, 8-base, 9- overall sleeve, 10- overall sleeve base, 11-upper fixing ring, 12-demolding module, 13-bottom surface support, 14-fixing support B, 15-opening.

[0039] In at least one embodiment, as Figures 1-12As shown, the 50mm*100mm cylindrical sample preparation method is introduced as an example, a rock sample preparation method reflecting the structural surface angle and roughness, comprising the following steps:

[0040] Step 1, obtain the roughness information of the rock structure surface;

[0041] Step 2, design a sample preparation mold that can reflect the different angles and roughness of the structure surface, use 3D printing technology to obtain the sample preparation mold, and analyze the main mineral composition of the parent rock to determine the proportion of similar materials.

[0042] The sample preparation mold includes a lower sleeve, a structure surface reflecting base and a whole sleeve, the whole sleeve is fixed through an upper fixing ring and a whole sleeve base, the structure surface reflecting base includes a large-angle structure surface reflecting base and a small-angle structure surface reflecting base, the small-angle structure surface reflecting base includes a structure surface reflecting bottom plate and a lower sleeve fixing support A, the structure surface reflecting bottom plate is in close contact with the upper end of the fixing support A, the large-angle structure surface reflecting base includes a structure surface reflecting bottom plate, a bottom support and a fixing support B, the lower sleeve has a shortest axis with an opening for facilitating sample demolding; different angles are the angles between the structure surface and the horizontal direction, and the lower sleeve of any angle can be prepared according to requirements, and the present application only shows 0°, 15°, 30°, 45°, 60°, 75° and 90°, wherein the structure surface molds with 75° and 90° inclination cut the bottom of the cylindrical sample, the established base is large-angle, and the established model includes the bottom support and the fixing support B, and the 75° fixing support is used to fix the lower sleeve of the 75° mold.

[0043] The similar materials are prepared according to the main mineral composition of the parent rock to ensure that the mechanical properties of the parent rock are similar. The parent rock category can be selected as required, for example, the main mineral composition of marble is dolomite and calcite, 80-mesh calcite sand and 120-mesh dolomite sand can be selected as coarse aggregate, 325-mesh calcite powder can be selected as fine aggregate, semi-hydrated gypsum and Portland cement can be selected as cementing agents, both of which act as auxiliary materials and have a content much lower than that of the aggregate, and a density of 7.8g / cm 3 Iron powder can be used as a densification agent to increase the specific gravity of the similar material, and distilled water is used for similar material configuration.

[0044] The three-dimensional model of the sample preparation mold comprises the following steps:

[0045] Firstly, the grid information of the natural rock mass structure surface is obtained: the three-dimensional scanner is used to obtain the grid information of the natural rock mass structure surface, and the file is converted into a format recognizable by the modeling software;

[0046] Second step, the establishment of the three-dimensional model of the sample mold: using modeling software to establish the rock mass structure surface into a structure surface bottom plate with a thickness of A, then establish a lower sleeve with different angles, according to the lower sleeve established to obtain the long axis length and the short axis length of the bottom ellipse, and then establish the bottom ellipse, draw an external ellipse on the basis of the bottom ellipse, and get a hollow plane, set the hollow plane to have a certain thickness B, cut along the short axis length direction to get a fixed support A, the lower sleeve needs to be cut along the shortest axis direction with a thickness of D to get an opening, combine the structure surface bottom plate and the fixed support A into a base, and establish the overall sleeve, the upper fixed ring and the overall sleeve base, that is, the three-dimensional model of the mold is obtained, wherein the thickness A of the structure surface bottom plate is 4mm, the thickness B of the fixed support A is 3mm, the thickness D is 0.2mm, the inner diameter of the overall sleeve and the lower sleeve is 50mm, the outer diameter is 54mm, the height of the overall sleeve is 100mm, and the size can be adjusted according to the needs.

[0047] Third step, 3D printing: convert the lower sleeve and the base established in the second step into ".stl" format, import the stl format file into the corresponding slicing software of the 3D printer, adjust the parameters, slice, import the 3D printer after slicing, and print to obtain the required mold.

[0048] Among them, when selecting the rock mass structure, jointed rock with different roughness can be selected to establish the structure surface bottom plate.

[0049] Step 3, assemble the mold and pour the similar material to obtain a half sample, after the sample is finally cured, put it into the overall mold and then pour the second time; Specifically, fix the lower sleeve and the base as a whole, apply release agent on the structure surface bottom plate, weigh and uniformly stir the similar material, pour it into the mold and fully vibrate on the vibrating table, keep the upper part of the mold horizontal with the ground after vibrating, and place it for 12h, then demold, separate the lower sleeve and the base, get a sample C with the roughness information of the rock structure surface, then put the demolded sample C into the overall sleeve, install the upper fixed ring and the overall sleeve base, apply release agent on the structure surface, and continue to pour the other half of the sample, wherein the release agent can be vaseline, polytetrafluoroethylene, paraffin and the like, which can be selected according to the characteristics of the similar material and the mold. In this embodiment, paraffin is selected.

[0050] Among them, when pouring the similar material to obtain a half sample, the volume of the sample C is half of the volume of the overall sample, and the structure surface is matched with the other half structure surface.

[0051] Step 4: After the sample is demolded, curing and post-processing are carried out. Specifically, the complete sample poured in step 3 is demolded after 12 hours, the upper fixing ring is removed and the demolding module on the whole sleeve base is dragged to demold, and the rock sample with different angles and roughness is obtained after curing for 28 days under standard conditions.

[0052] In at least one embodiment, the structural plane bottom plate is not a single roughness, and jointed rock with different roughness can be selected to establish the structural plane bottom plate, so as to control the roughness of the structural plane of the rock sample.

[0053] In at least one embodiment, the whole mold is printed by using ABS material, the mold is easy to clean after use, does not affect secondary use, and can be repeatedly tested.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not drive the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for manufacturing a rock sample capable of reflecting the angle and roughness of a structural plane, characterized by, The method comprises the following steps, Step 1, obtaining roughness information of rock structural plane; Step 2, designing a sample preparation mold capable of reflecting different angles and roughness of the structural plane, using 3D printing technology to obtain the sample preparation mold, and analyzing the main mineral composition of the parent rock to determine the proportion of the similar material; Step 3, assembling the mold, pouring the similar material to obtain a half sample, and after the sample is finally cured, it is placed into the whole mold for secondary pouring; Step 4, after the sample is demolded, it is cured and post-treated; The mold in step 2 comprises a lower sleeve, a structural plane reflecting base and a whole sleeve, the whole sleeve is fixed through an upper fixing ring and a whole sleeve base, the structural plane reflecting base comprises a large-angle structural plane reflecting base and a small-angle structural plane reflecting base, the small-angle structural plane reflecting base comprises a structural plane reflecting bottom plate and a lower sleeve fixing support A, the structural plane reflecting bottom plate is closely connected with the upper fixing support A, the large-angle structural plane reflecting base comprises a structural plane reflecting bottom plate, a bottom surface support and a fixing support B, and the lower sleeve has an opening with the shortest axis for facilitating demolding of the sample; different angles are the angles between the structural plane and the horizontal direction, and the lower sleeve with any angle can be prepared according to needs; the structural plane reflecting bottom plate is selected from jointed rocks with different roughness; In step 2, when the parent rock is marble, 80-mesh calcite sand and 120-mesh dolomite sand are selected as coarse aggregates, 325-mesh calcite powder is selected as fine aggregate, semi-hydrated gypsum and Portland cement are selected as cementing agents, both of which act as auxiliary materials and have a content far lower than that of the aggregates, and iron powder with a density of 7.8 g / cm 3 is selected as a densification agent, distilled water is used for similar material configuration, and the similar material ratio is determined through orthogonal test. The three-dimensional model preparation step of the mold in step 2 comprises the following steps: First step, obtaining grid information of the natural rock mass structural plane: using a three-dimensional scanner to obtain the grid information of the natural rock mass structural plane, and converting the file into a format recognizable by modeling software; Second step, establishing a three-dimensional model of the sample preparation mold: using modeling software to establish a structural plane bottom plate with a thickness of A, then establishing a lower sleeve with different angles, obtaining the long axis length and short axis length of the bottom ellipse according to the established lower sleeve, and then establishing a bottom ellipse, drawing an external ellipse on the basis of the bottom ellipse, and obtaining a hollow plane, setting the hollow plane to have a thickness B, cutting a fixing support A along the short axis length direction to obtain a fixing support A, and cutting the lower sleeve along the shortest axis direction to obtain an opening with a thickness of D, combining the structural plane bottom plate and the fixing support A into a small-angle structural plane reflecting base, and establishing a whole sleeve, an upper fixing ring and a whole sleeve base, so as to obtain a three-dimensional model of the mold; Third step, 3D printing: importing the lower sleeve and the small-angle structural plane reflecting base established in the second step into the corresponding slicing software of the 3D printer, adjusting the parameters, slicing, importing the sliced data into the 3D printer for printing, and thus obtaining the required mold. In step 3, the lower sleeve and the reflecting structure surface base are fixed as a whole, a release agent is coated on the structure surface base, similar materials are weighed and stirred uniformly, the materials are poured into the mold and fully vibrated on a vibrating table, after vibration, the upper mold is kept horizontal with the ground for 12 h, then demolding is carried out, the lower sleeve and the reflecting structure surface base are separated, a sample C with roughness information of a rock structure surface is obtained, then the sample C obtained by demolding is placed in the integral sleeve, the upper fixing ring and the integral sleeve base are installed, a release agent is coated on the structure surface, and pouring of the other half of the sample is continued; the sample C has a volume of half of the volume of the integral sample, and the structure surface is fitted with the other half of the structure surface.

2. The method of claim 1, wherein the method is characterized by: In the second step of the three-dimensional model making step of the mold of step 2, the thickness A of the structure surface base is 4 mm, the thickness B of the fixed support A is 3 mm, and the thickness D is 0.2 mm.

3. The method of claim 1, wherein the method further comprises: 5 applying a layer of a transparent material to the surface of the rock sample; and 10 applying a layer of a reflective material to the layer of the transparent material. 15 Step 4 is specifically that, after 12 h, the complete sample poured in step 3 is demolded, the upper fixing ring is removed, and the demolding block on the integral sleeve base is pulled to demold, and a rock sample with different angles and roughness is obtained after curing for 28 days under standard conditions.

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